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Vypočítajte zľavnenú cenu a koľko ušetríte pri akejkoľvek percentuálnej zľave.

Vypočítajte spotrebu energie spotrebiča v kWh a náklady na jeho prevádzku z príkonu, hodín za deň, dní a vašej sadzby za kWh elektriny.

Zistite presne, akú známku potrebujete na záverečnej skúške, aby ste dosiahli cieľovú známku, na základe vašej aktuálnej známky a váhy skúšky.

Pridajte alebo odčítajte GST vo výške 5%, 12%, 18% alebo 28% a okamžite zobrazte čistú sumu, účtované GST a hrubý súčet.

Vypočítajte, koľko litrov farby potrebujete z plochy steny, výdatnosti farby na liter a počtu náterov.

Vypočítajte plochu obdĺžnikovej miestnosti alebo priestoru v štvorcových stopách a štvorcových metroch z jej dĺžky a šírky, plus voliteľné celkové náklady na materiál.

Vypočítajte prepitné, celkový účet a sumu na osobu — ideálne na rozdelenie reštauračného účtu.

Vypočítajte pomer strán ľubovoľného rozlíšenia a nájdite chýbajúcu šírku alebo výšku pri zachovaní proporcií.

Odhadnite počet tehál alebo tvárnic a množstvo malty potrebnej na stenu podľa plochy steny a rozmerov tehly, mínus otvory.

Vypočítajte plochu koberca a potrebné bežné metre z pevnej šírky kobercového pásu, so stratou na prispôsobenie a odrezky.

Spočítajte, čo vaša denná káva skutočne stojí za týždeň, mesiac a rok.

Získajte dokonalý pomer kávy a vody v gramoch pre ľubovoľnú silu varenia alebo počet šálok.

Odhadnite množstvo betónu na dosku z dĺžky, šírky a hrúbky v metrickej alebo imperiálnej sústave. Získajte objem v kubických yardoch a kubických metroch, plus počet vriec po 40, 60 a 80 lb.

Zistite, koľko stojí každá porcia jedla z celkovej ceny a počtu porcií.

Pozrite sa na skutočné náklady na jedno použitie ľubovoľného nákupu na základe ceny a frekvencie použitia.

Hoďte ľubovoľný počet kociek s ľubovoľným počtom stien (NdM) a pozrite sa na každú kocku aj na celkový výsledok.

Vypočítajte počet sadrokartónových dosiek, skrutiek, tmelu a pásky pre miestnosť na základe plochy stien a stropu.

Calculate arc length, radius, included angle and area of a circular arch from span and rise. For doorways, bridges and architectural arches.

Calculate how much asphalt (hot-mix) you need by weight and volume from area length, width and thickness. Supports metric and imperial.

Check if your bag meets airline weight limits. Enter bag weight, the airline allowance and the per-kg excess fee to see total charges.

Find out how long you can safely stay in the sun without burning, based on UV index, your Fitzpatrick skin type and sunscreen SPF.

Rozdeľte spoločný účet vrátane dane a prepitného rovnomerne medzi ľubovoľný počet ľudí.

Vypočítajte doskové stopy a celkové náklady na rezivo podľa hrúbky, šírky, dĺžky a množstva.

Convert BPM to note durations in milliseconds, find the Italian tempo marking, and get beat frequency in Hz for any music tempo.

Calculate how much salt to add to water for any brine concentration — perfect for pickling vegetables, lacto-fermentation, and curing.

Convert butter between US sticks, cups, tablespoons, teaspoons, grams, ounces, and pounds in one click.

Zistite, koľko minút chôdze, behu, cyklistiky alebo plávania spáli daný počet kalórií.

Odporučte správny priemer lopatiek stropného ventilátora pre miestnosť podľa jej podlahovej plochy, s tipom na dĺžku tyče.

Calculate cement bags, sand and aggregate for any volume of concrete. Choose a standard mix grade (M10–M25) or enter a custom ratio to get material quantities instantly.

Calculate the required CFM airflow for any room using its dimensions and target air changes per hour (ACH).

Convert octal chmod digits (e.g. 755) to symbolic file permissions (rwxr-xr-x) and see what each bit means.

Calculate the chord length, sagitta, arc length and circular segment area from a circle radius and central angle.

Enter an IPv4 CIDR block (e.g. 10.0.0.0/8) to get its network range, host count and how many subnets of a chosen prefix fit inside it.

Calculate the exact grams of coffee grounds and ml of water for any brewing method — drip, espresso, French press, pour over, AeroPress or cold brew.

Nájdite pravdepodobnosť získania presne, aspoň alebo najviac k orlí v n hodoch mincou.

Odhadnite denné, mesačné a ročné náklady na dochádzanie autom vrátane paliva, mýtneho a parkovania.

Add or subtract any number of days from a date to find a future or past date. Shows the day of week, weeks, and approximate months.

Odhadnite dosky terasy, trámy a upevňovacie prvky pre terasu podľa jej veľkosti, šírky dosky a rozstupov trámov.

Estimate how many diapers your baby needs and the total cost over any period, from a few weeks to a full year.

Calculate the volume and surface area of a torus (donut shape) from major radius R and minor radius r in any length unit.

Vypočítajte DPI tlače z pixelov a veľkosti obrázka alebo zistite, koľko pixelov potrebujete na ostrý výtlačok.

Calculate Defects Per Million Opportunities (DPMO), the Six Sigma sigma level, and process yield for quality analysis.

Find the exact date of Easter Sunday for any year from 1583 to 9999 using the Meeus/Jones/Butcher Gregorian algorithm.

Calculate your effective DPI (eDPI) by multiplying mouse DPI × in-game sensitivity, and find your cm/360° rotation distance.

Calculate how much epoxy resin and hardener to mix for any casting or tabletop project — enter mold dimensions, mix ratio and a waste allowance.

Calculate a building's Energy Use Intensity (EUI) in kBtu/sq ft/yr or kWh/m²/yr from annual electricity and gas use, with ENERGY STAR benchmark comparison.

Calculate how many yards or metres of fabric you need for any sewing or quilting project. Includes seam allowance, waste factor and bolt-width layout.

Vypočítajte stĺpiky, panely, laty a priečniky plota z celkovej dĺžky a rozostupu.

Calculate the Exposure Value (EV) from your aperture, shutter speed and ISO — instantly see how your camera settings map to scene brightness.

Preveďte navrstvenú kopu dreva na kordy a plošné kordy podľa dĺžky, šírky a výšky a skontrolujte hodnotu za kord.

Calculate flag height, area, diagonal and perimeter from the width and aspect ratio — useful for ordering fabric or making flags to correct proportions.

Calculate the exact nut-to-fret distance for any fret on a guitar, bass or other fretted instrument from the scale length.

Odhadnite náklady na palivo akejkoľvek cesty z vzdialenosti, účinnosti vozidla a ceny paliva, plus potrebné litre a náklady na kilometer.

Calculate gas cost for any trip from distance, MPG or L/100 km, and fuel price — plus fuel needed and CO₂ emissions.

Určte veľkosť záložného generátora súčtom pracovných a rozbiehacích wattov spotrebičov, ktoré chcete napájať.

Spravodlivo rozdeľte sviatočný alebo podujatový rozpočet na darčeky medzi všetkých na vašom zozname.

Vypočítajte svoj vážený priemer známok z bodov za známku a kreditných hodín každého predmetu — rýchle, presné vážené GPA za sekundy.

Calculate your weighted average grade from up to five assignments or exams. Enter each score and its percentage weight to get the final grade and letter grade instantly.

Zistite, koľko trávneho semena kúpiť pre nový trávnik alebo dosievanie, na základe plochy a odporúčanej výsevnej normy.

Zistite, koľko štrku alebo kameniva potrebujete z dĺžky, šírky a hĺbky — získajte objem v m³ a yd³, hmotnosť v tonách a US tonách a náklady.

Calculate how much grout you need for any tiled surface. Enter tile size, joint width, grout depth, and total area to get kg and bag counts with a waste allowance.

Check whether your vehicle is within its Gross Vehicle Weight Rating. Enter GVWR, curb weight, cargo and passengers to see remaining payload capacity and load percentage.

Calculate your GWA (General Weighted Average) for the Philippine academic system. Enter up to five subject grades (1.0–5.0 scale) and credit units to get your weighted average and honor standing.

Calculate GWAM (Gross Words A Minute) and NWAM (Net WPM) from keystrokes, test time and errors — with a speed-tier benchmark.

Calculate hours and minutes between a start time and an end time, with optional break deduction — gives decimal hours and H h MM min format.

Preveďte IPv4 adresu na 32-bitové desatinné celé číslo (a hex/binárne), alebo preveďte celé číslo späť na bodkovaný formát.

Calculate your Kill/Death (K/D) ratio, KDA ratio and win rate — for any FPS, battle royale or MOBA game.

Odhadnite, koľko balení a dosiek laminátovej alebo drevenej podlahy potrebujete pre miestnosť vrátane rezervy na odrezky.

Zistite, koľko hnojiva použiť na dosiahnutie cieľovej dávky dusíka na základe percentuálneho zastúpenia NPK na obale.

Calculate the LM317 output voltage from R1 and R2, or find R2 for a target output voltage — with minimum input voltage and power dissipation.

Vytiahnite náhodné čísla lotérie (napr. 6 z 49) bez opakovania plus voliteľná bonusová gulička.

Calculate how many lumber boards you need for a deck, floor, or wall project, with a waste allowance and total cost estimate.

Convert any number of minutes to hours, seconds, days and weeks — and see the result in H h MM min format for timesheets and scheduling.

Odhadnite tenkovrstvovú maltu a dlaždicový tmel pre obkladanie na základe plochy, veľkosti dlaždíc a šírky špár.

Calculate how much cement, sand and water you need for a masonry mortar mix from area, joint depth and mix ratio.

Calculate miles per gallon (MPG) or L/100 km fuel economy, plus trip cost and cost per mile from distance and fuel used.

Zistite, koľko kubických yardov alebo vriec mulče potrebujete podľa dĺžky, šírky a hĺbky záhonu vrátane počtu vriec a objemu.

Calculate how many boxes fit on a standard pallet, how many layers stack within a height limit, and the total loaded weight.

Calculate the even or odd parity bit for any binary word — shows the complete data word with its parity bit appended.

Naplánujte, koľko jedla, nápojov a ľadu kúpiť na oslavu podľa počtu hostí a dĺžky.

Odhadnite silu hesla v bitoch entropie a približný čas prelomenia z jeho dĺžky a množiny znakov.

Generujte silné náhodné heslo a merajte jeho silu ako entropiu v bitoch.

Zistite, koľko dlažobných dlaždíc a koľko podkladového piesku potrebuje terasa alebo chodník podľa plochy a veľkosti dlaždice.

Calculate the PERT expected task duration, standard deviation and confidence intervals from optimistic, most likely and pessimistic time estimates.

Calculate how many pizzas to order for any group size — choose appetite level, slices per pizza and an optional buffer for seconds.

Calculate pond volume in US gallons and litres for rectangular, oval or circular ponds, plus pump size and fish stocking capacity.

Calculate swimming pool volume in US gallons and litres, shock chlorine dose and filter pump size for rectangular, oval or circular pools.

Vypočítajte hustotu pixelov displeja v PPI a rozostup bodov z jeho rozlíšenia a uhlopriečnej veľkosti.

Calculate how much fabric you need for a quilt: top, backing and binding yardage from quilt size, block size, seam allowance and fabric width.

Vylosujte jedného alebo viacerých náhodných víťazov zo zoznamu prihlásených, s voliteľnými váženými lístkami.

Calculate usable capacity, storage efficiency, and fault tolerance for RAID 0, 1, 5, 6, 10, 50 and 60 arrays from disk count and disk size.

Vygenerujte náhodnú farbu a okamžite získajte jej HEX, RGB a HSL kódy.

Generujte jedno alebo viacero náhodných celých čísel v ľubovoľnom rozsahu, ktorý si zvolíte — skvelé pre žrebovania, výbery, hry, vzorkovanie a rýchle rozhodnutia.

Zamiešajte zoznam mien do vyvážených náhodných tímov takmer rovnakej veľkosti.

Odhadnite, ako dlho trvá prečítanie textu, na základe počtu slov a rýchlosti čítania.

Calculate the weight of steel rebar (reinforcing bar) for construction. Enter the diameter, length and quantity to get weight per bar and total weight in kg.

Zdvojnásobte, strojnásobte alebo znásobte ľubovoľný recept okamžitým prepočtom každej suroviny na požadovaný počet porcií.

Odhadnite strešné štvorcové jednotky a zväzky šindľov z pôdorysu a sklonu strechy vrátane odpadu na hrebene a rezy.

Určite veľkosť klimatizácie alebo ohrievača v BTU pre miestnosť podľa jej plochy, slnečného žiarenia, výšky stropu a počtu osôb.

Convert RPM to angular velocity (rad/s), frequency (Hz), period, and peripheral speed — for motors, engines, wheels, and fans.

Calculate the sag (mid-span deflection) and cable length of a wire or cable between two supports using the parabolic and catenary formulas.

Calculate how much sand you need by volume (m³, yd³) and weight (tonnes, kg) from area length, width and depth. Supports metric and imperial.

Preveďte uhlopriečnu veľkosť a pomer strán obrazovky na jej skutočnú šírku, výšku a plochu.

Estimate calories burned during sexual activity by body weight, duration and intensity, using MET values from Ainsworth's Compendium (2011).

Calculate how many squares of exterior siding you need from house dimensions, gables, openings and waste allowance. Supports metric and imperial.

Vypočítajte, koľko roliek alebo paliet drnu potrebujete na pokrytie trávnika, vrátane príspevku na odpad pri strihaní.

Vypočítajte výšky schodníc, nášľapy a dĺžku schodnicového nosníka z celkovej výšky, pričom skontroluje pravidlo komfortu 2R+T.

Calculate stair riser height, tread going, stringer length and pitch angle from total rise and number of risers.

Calculate how many tonnes of decorative stone, pebbles or chippings you need by area and depth, with bag count and cost estimate.

Zadajte IPv4 adresu a prefix (CIDR) a získajte adresu siete, broadcast, rozsah použiteľných hostiteľov, počet hostiteľov a masku podsiete.

Spočítajte všetky predplatné za streamovanie a aplikácie do jednej mesačnej a ročnej sumy.

Calculate sulfur (SO₂) emissions from burning coal, oil or diesel by entering the fuel mass and its sulfur content by weight.

Calculate the included taper angle, half-angle, taper per foot (or per 300 mm) and taper ratio from two diameters and a length.

Calculate pitch diameter, minor diameter, thread depth and lead angle for metric ISO and unified (UNC/UNF) screw threads.

Zistite, koľko dlaždíc potrebujete na podlahu z plochy miestnosti a veľkosti dlaždice, s rezervou na odpad pre rezy a poškodenia.

Odhadnite objem zeminy, hmotnosť a počet vriec pre záhradný záhon alebo trávnik z plochy a hĺbky výplne.

Odhadnite úplné náklady na vlastníctvo auta alebo spotrebiča vrátane prevádzkových nákladov a zostatkovej hodnoty.

Calculate how US import tariffs raise the landed cost of goods — enter unit price, the applicable tariff rate, and quantity to get the total after-tariff price.

Vypočítajte rýchlosť písania v slovách za minútu plus čistý WPM a presnosť z časovaného testu.

Porovnajte dva produkty podľa ceny za jednotku a nájdite lacnejší nákup — prekonajte zavádzajúce veľkosti balenia a vyberte najlepšiu hodnotu zakaždým.

Preveďte percento dostupnosti SLA (napríklad 99,9 %) na povolený čas výpadku za deň, týždeň, mesiac a rok.

Calculate the allowed downtime per year, month, week, and day for any uptime SLA percentage — from 90 % (one nine) to 99.9999 % (six nines).

Zistite, koľko zvitkov tapety potrebujete na základe rozmerov miestnosti, veľkosti zvitku a vzoru, vrátane strát pri strihaní.

Convert any number of weeks to days, hours, minutes, seconds, months and years instantly. Fractional weeks are supported.

Zistite potrebnú dĺžku a sklon rampy pre daný výškový rozdiel a overte súlad s maximálnym sklonom ADA 1:12.

Nechajte náhodu rozhodnúť: získajte náhodné Áno alebo Nie s nastaviteľnými šancami a zobrazte rozdelenie pravdepodobnosti.

Calculate average G-force, distance covered and power from a 0–60 mph time. Works for any car, bike or EV spec sheet.

Find the exact date that is 100 days (or any number of days) from a start date — shows the weekday, month breakdown and week count.

Find the exact date that is 120 days (or any number of days) from a start date — with weekday, week breakdown and calendar-year context.

Find the exact date 180 days from any start date, or 180 days in the past. Useful for visa rules, financial deadlines, and legal timeframes.

Find the exact date that is 30 days (or any number of days) before or after a given start date.

Find the exact time that is 30 minutes (or any number of minutes) before or after a given start time.

Calculate the cost of a 3D print from filament or resin weight, material price per kg, electricity rate, and expected failure rate.

Estimate 3D render time for animations and stills: enter a test-frame benchmark, scale to final sample count and total frames.

Find the date that is exactly 45 days (or any number of days) before or after any start date — shows the weekday and weeks + days breakdown.

Find the exact date that is 6 months before or after any calendar date, plus the difference in days and weeks.

Find the exact date 60 days before or after any calendar date, with the day of the week, weeks and approximate months.

Calculate when your work shift ends given a start time, paid hours and unpaid break duration — works for any shift length.

Find the date exactly 90 days (or any number of days) from a start date — shows the weekday, month and year of the result.

Calculate the air conditioner tonnage and BTU/hr needed for a room based on area, ceiling height, climate, and occupancy.

Calculate acceptance rate as a percentage: accepted ÷ applied × 100. Also shows rejection rate and odds against acceptance.

Calculate your ACT composite score from English, Math, Reading and Science section scores, plus your approximate national percentile.

Add up to four time durations expressed as hours and minutes — get the total in H h MM min format and as decimal hours.

Add (or subtract) any number of hours and minutes to a start time — handles day rollovers and shows the result in 12-hour and 24-hour format.

Find the exact age difference between two people in years, months and days. Enter any two dates of birth to see the precise gap.

Find out exactly how many days old you are. Enter your date of birth and a reference date to get the precise day count.

Calculate exactly how many hours old you are. Enter your date of birth and a reference date to get the precise hour count.

Calculate the exact number of minutes you have been alive. Enter your date of birth and a reference date to get the total minute count.

Calculate exactly how many months old you are from any birth date to a reference date.

Find out exactly how many seconds old you are from any birth date to a reference date.

Calculate exactly how many weeks old you are from a birth date to any reference date.

Calculate your exact age in years as a decimal, plus a full breakdown into years, months, days, weeks, and total days.

Find out how old you would be on Mercury, Venus, Mars, Jupiter, Saturn, Uranus, and Neptune.

Enter an age in years, months, and days to calculate the estimated birth date on any reference date.

Estimate how much AI could automate your job based on task type, routine work %, social interaction and physical dexterity.

Calculate air changes per hour (ACH) for any room. Enter dimensions and airflow rate to see if your ventilation meets ASHRAE guidelines.

Calculate the AC cooling capacity (BTU/h and tonnage) needed for your room based on area, ceiling height, sun exposure, occupants and kitchen heat.

Calculate ABV from original and final gravity readings — plus apparent attenuation, calories per serving, and standard drinks.

Calculate how much water to add to dilute a spirit or alcohol solution from a higher ABV to a target ABV — using the C₁V₁ = C₂V₂ formula.

Calculate the weight of aluminum sheet, round rod, square bar, or tube in kg, lb or grams from dimensions and alloy density.

Calculate the theoretical speedup of a parallel program using Amdahl's Law — enter the parallel fraction and number of processors.

Calculate your impostor probability, kills needed to win, votes for majority eject, and random-eject odds for any Among Us lobby.

Calculate the miter saw angle to cut each board for any regular polygon frame or custom corner angle — picture frames, crown molding, and multi-sided projects.

Calculate the angle of depression from observer height and horizontal distance — includes slant distance and slope gradient.

Find the angle at which a projectile hits the ground given launch speed, angle, and height. Includes impact speed, range, and flight time.

Calculate how long since any event date, find the next anniversary, and see traditional anniversary gift names.

Find the antipode of any location: the point on the exact opposite side of the Earth, given a latitude and longitude.

Estimate your AP Biology exam score (1–5) from your multiple choice and free response raw scores using the College Board weighting.

Estimate your AP Chemistry exam score (1–5) from your multiple choice and free response raw scores using the College Board section weighting.

Estimate your AP English Language and Composition score (1–5) from your multiple choice and essay raw scores using College Board section weighting.

Estimate your AP World History composite score and predicted AP score (1–5) from your MCQ, SAQ, DBQ, and LEQ raw scores.

Calculate how much an appliance has depreciated and its current book value using straight-line or declining-balance methods.

Calculate an appliance's real power (watts), apparent power (VA) and energy use from its voltage, current and power factor.

Calculate the minimum glass thickness for a rectangular aquarium based on plate bending theory, tank dimensions and a safety factor.

Calculate the volume of a rectangular or cylindrical aquarium in litres, including water weight for fresh and saltwater setups.

Convert text to ASCII decimal codes (and hex / binary), or convert ASCII codes back to readable text instantly.

Estimate audio file size for WAV, FLAC, MP3, and AAC from duration, sample rate, bit depth and channel count.

Calculate how long an audiobook takes to finish at any playback speed (0.5× to 4×) and see exactly how much time you save.

Find how many audiobooks you can finish per week, month, or year based on daily listening time, book length, and playback speed.

Calculate the azimuth (compass bearing) and great-circle distance between two geographic coordinates using latitude and longitude.

Find your baby's exact age in days, weeks, months and years from their date of birth.

Calculate your total back-to-school budget: supplies, clothing, electronics, activity fees, and lunches for one or more children.

Calculate the exact salt, pink curing salt, and sugar amounts for equilibrium-curing a pork belly or other cut, plus minimum fridge curing time.

Convert baker's percentages into gram weights for any flour amount. Enter hydration, salt, yeast, and other ingredient percentages to get your full recipe.

Calculate how many balloons you need for a balloon arch or garland by entering arch length, balloon size, and style.

Calculate how many balusters (spindles) you need and the exact gap spacing to meet building code requirements for a railing or staircase.

Calculate how long a file transfer will take given your connection speed, or find the bandwidth needed to transfer a file in a target time.

Calculate the bandwidth-delay product (BDP) to find the minimum TCP window size needed to fully utilise a network link.

Encode plain text to Base64 or decode a Base64 string back to text — instantly in your browser, with size overhead stats.

Compare annual water use and CO₂ emissions from baths versus showers. See which habit uses more energy and how to reduce your footprint.

Find the ideal bathroom mirror width, height and mounting position based on your vanity size and eye height. Includes inches and cm.

Convert battery capacity from mAh to Wh, joules and kWh. Check against the IATA 100 Wh air-travel limit and see current state of charge.

Calculate how long it takes to charge a battery. Enter capacity (mAh), charger current (mA), starting level and efficiency for an accurate time estimate.

Calculate how long a battery will last. Enter capacity (mAh) and device current draw (mA) to get runtime in hours and days of use.

Calculate the battery capacity (mAh) needed to run a device for a target time, or how long a battery will last at a given current draw.

Convert baud rate to bits per second, characters per second and file transfer time for UART, RS-232 and modulated RF links.

Calculate the BBQ grill cooking area you need for your guest count and food type, with recommended grill size category.

Calculate how much meat, burgers, sausages, sides, drinks and ice to buy for a BBQ party based on guests and party length.

Convert BC (BCE) years to AD (CE), find how many years ago an event happened, and see the century, millennium and timeline position.

Estimate the total cost of a beach day — transport, parking, food, drinks, sunscreen, equipment rental and activities — split by person.

Calculate maximum beam deflection for simply supported or cantilever beams with a central point load or uniform distributed load. Rectangular sections.

Calculate support reactions (R_A, R_B) and the maximum bending moment for a simply supported beam under a point load or uniform distributed load.

Calculate how many litres of EPS beads or shredded foam you need to fill a bean bag chair by entering its diameter and desired fill level.

Calculate how many days a beauty or skincare product will last given its volume and your daily usage, plus cost per day.

Look up standard US and EU bed dimensions, check if a bed fits your room, and see floor coverage and clearance around the bed.

Calculate how many cups and how much beer you need for beer pong, including standard drinks per player per game.

Find your belt size from your waist measurement. Converts between US/UK inch sizing and EU centimetre sizing instantly.

Calculate bending stress (σ = M/S) in a rectangular or circular beam cross-section from the applied bending moment, width and height.

Decode binary code into readable text — paste space-separated 8-bit bytes or a continuous bit string to get the ASCII output.

Find out how many days it will take to binge a TV show — enter seasons, episodes, episode length and daily hours to watch.

Calculate the seat cut bearing length, pitch angle, and structural check for a birdsmouth notch in roof rafter carpentry.

Calculate your estimated birth year from your current age and the reference year — with a two-year range to account for whether your birthday has passed.

Calculate the estimated birth year from a year of death and recorded age at death — useful for genealogy, obituaries, and historical research.

Calculate your exact age, total days lived, zodiac sign, the weekday you were born, and how many days remain until your next birthday.

Count the exact days until your next birthday, see which age you will be turning, track weeks remaining and view your progress through the current birthday year.

Calculate the correct width and drop for roller, venetian or vertical blinds for inside (recess) or outside (wall) mount — with standard deductions.

Find out how many shots to take to get at least one blink-free group photo, based on group size and blink rate.

Calculate how many wide boards and narrow battens you need for board-and-batten siding, plus total linear footage with waste factor for any number of walls.

Calculate board feet for a piece of lumber from its thickness, width and length; convert to cubic inches or cubic meters.

Estimate boards, posts and rails for a board-on-board privacy fence from fence length, board width and overlap.

Calculate boat speed in knots, km/h and mph from distance and time; also compute theoretical hull speed from waterline length.

Estimate the right boiler output (kW) for your home from floor area, insulation level and number of bathrooms.

Generate Unicode mathematical bold text from any Latin text — copy and paste the bold characters into social media, messaging apps or documents.

Calculate bolt circle (PCD) chord length, arc spacing and hole coordinates for any bolt pattern — for machining, automotive wheels and flange design.

Calculate the tightening torque needed to achieve a target bolt clamping force using the torque-tension formula T = K × F × d, with unit conversions.

Track your annual (or any-length) reading challenge: see if you are on pace, how many books you need per week, and your projected total.

Estimate horsepower gain from a turbocharger or supercharger using boost pressure, base HP and mechanical efficiency.

Calculate the volume, curved surface area and base area of a spherical bowl (spherical cap) from its sphere radius and segment height.

Calculate how many items fit in a box given box and item dimensions, plus fill percentage and wasted space.

Find your UK/US bra size from underbust and overbust measurements in inches or centimetres in seconds.

Calculate how much butter, jam or other spread you need for any number of bread slices, how many jars to buy, and the calorie total.

Calculate Brake-Specific Fuel Consumption (BSFC) from fuel flow rate and brake power to compare engine efficiency.

Encrypt or decrypt text with the Caesar cipher: shift each letter by N positions in the alphabet (ROT13, ROT5, or any shift 0–25).

Convert cake recipes between different pan sizes and shapes by comparing volumes. Get an exact scale factor to multiply every ingredient by.

Calculate the right selling price for a custom cake by adding ingredient cost, labor, overhead, and a profit markup.

Calculate how many slices a round, square, or rectangular cake yields based on pan size and serving size (party, wedding, or generous).

Calculate the number of days between two dates, or add and subtract days from a date. Includes weeks, months, and day-of-week.

Count the exact days, weeks, hours and minutes between any two dates — deadlines, holidays, birthdays or anniversaries.

Calculate horizontal, vertical and diagonal field of view (FOV) in degrees from focal length and sensor size, with crop factor and 35 mm equivalent.

Convert text to Title Case, Capitalized Words, UPPER CASE, lower case, Sentence case, or aLtErNaTiNg case instantly.

Convert gemstone carat weight to grams, milligrams, troy ounces and grains, and calculate the total value from a price per carat.

Convert any greenhouse gas mass to CO₂ equivalent (CO₂e) using IPCC AR6 100-year global warming potential values.

Calculate how much you save each month and year by carpooling — split fuel and parking costs equally among all riders.

Calculate shipment volume in CBM (cubic metres), volumetric weight for air/courier freight, and chargeable weight for any cargo.

Calculate the minimum indoor floor area, outdoor run size, nest boxes and roost bar length for your flock.

Estimate the annual and total cost of raising a child from birth to 18 by income tier, based on the USDA 2017 expenditure report scaled to 2022 dollars.

Calculate how many minutes it takes to chill a drink to your target temperature in a fridge, freezer, or ice bath using Newton's Law of Cooling.

Scale any chocolate recipe, calculate calories, fat, carbs and protein for any chocolate type, and find baking substitutions.

Find the notes in any major, minor, 7th, diminished or suspended chord for every root note.

Calculate root position, 1st and 2nd inversions of any triad or 7th chord — see the notes and intervals for every inversion.

Generate diatonic chord progressions for any key in major or natural minor — see the chord names for 7 popular patterns.

Transpose a chord progression up or down by any number of semitones, with sharps or flats and slash-chord support.

Estimate how many lights, ornaments, and garland feet your Christmas tree needs based on its height.

Calculate your exact age in years, months, and days from your birth date, plus total weeks, days, and hours lived.

Calculate the inner radius, outer radius and minimum fabric needed for a full, half or quarter circle skirt with seam allowance.

Calculate how many desks fit in a classroom with a rectangular grid layout, given room size, desk size, and minimum aisle gap.

Calculate how much a clay piece shrinks when drying and firing, or work backwards to find the wet size needed for a target fired dimension.

Estimate professional cleaning costs from the area, rate per square foot or metre, visit frequency, and any extras — per visit, monthly and annually.

Look up the ISO 273 clearance hole diameter for metric bolts M1.6–M24: choose close, medium, or free fit for your assembly requirement.

Calculate the duration between two times of day in hours, minutes and decimal hours. Handles overnight spans automatically.

Convert finger circumference from cm to mm and find your EU, US and UK ring size instantly.

Find your ring size from finger circumference in cm. Converts to EU, US, UK letter and Japanese ring sizes instantly.

Calculate the characteristic impedance, velocity factor, and capacitance per metre of a coaxial cable from conductor diameters and dielectric material.

Estimate the annual CO₂ footprint of your coffee habit — by brewing method and milk choice.

Find out when your caffeine peaks, when it halves and when it wears off — plan your last coffee for better sleep.

Find the perfect coffee-to-water ratio for cold brew — concentrate or regular strength — with yield and serving estimates.

Calculate your semester GPA and cumulative GPA on the standard 4.0 scale — enter grades and credit hours for each course.

Calculate annual commute time, yearly distance and CO₂ emissions from your daily trip to work.

Calculate engine compression ratio from bore, stroke, and clearance volume. Also shows swept volume and total displacement.

Convert engine compression ratio to estimated cylinder pressure in PSI, kPa, and bar using the adiabatic compression formula.

Estimate how many CMU concrete blocks and how much mortar a wall needs from wall dimensions and opening area. Supports 6", 8" and 12" block sizes.

Calculate how much grout or concrete is needed to fill hollow CMU block cores. Supports 6", 8", 10" and 12" blocks with full, alternate or rebar-only fill patterns.

Calculate concrete volume for round or rectangular columns in metric or imperial units. Enter diameter or width/depth, height and count to get yd³, m³ and bag estimates.

Calculate concrete volume for cylindrical tube-form footings — fence posts, deck piers and sign-post holes. Metric or imperial; 80, 60 and 40 lb bag counts included.

Estimate the cost of a concrete driveway from length, width and thickness. Includes material, labor, reinforcement and excavation — all cost rates are editable 2025 estimates.

Calculate concrete volume for a rectangular slab in cubic metres and cubic yards, plus how many 40, 60 or 80 lb bags you need.

Estimate concrete volume for a straight staircase from step count, rise, run and width, in cubic metres and cubic yards with bag counts.

Calculate concrete volume for cylindrical tube forms (Sonotubes, piers, footings) from diameter and depth in metric or imperial units.

Calculate the weight of a concrete volume in kilograms, pounds and tonnes. Supports normal, lightweight and heavyweight mixes with a custom density option.

Calculate how many boxes or cartons fit inside a shipping container or storage space given the container and box dimensions.

Convert cooking measurements between cups, tablespoons, teaspoons, fluid ounces, pints, quarts, gallons, mL and litres instantly.

Calculate how many cords of firewood are in a pile — enter pile length, height, and log length in feet.

Calculate the true cost per mile of driving by adding fuel, maintenance, insurance, depreciation and other annual costs, then dividing by miles driven.

Calculate cost per minute from a total charge and session duration. Useful for phone calls, consultations, streaming, hourly services and any time-based billing.

Enter hours worked each day of the week to count total hours, overtime, weekday average, and how each day contributes to your weekly total.

Count down days, hours, weeks and minutes to any future date — or count how many days have passed since a past date.

Calculate the countersink depth needed for a flush-head screw given its head diameter, pilot hole diameter and countersink angle (82°, 90° etc.).

Calculate the crop factor of any camera sensor and find the equivalent focal length on a 35 mm full-frame camera.

Calculate the fabric size needed for your cross-stitch project from stitch count, Aida count, and border allowance — plus a thread skein estimate.

Calculate crosstalk between audio or signal channels in dB — measure channel separation and determine whether interference is audible.

Calculate the crosswind and headwind components for any runway from wind speed and direction — essential for pilot go/no-go decisions.

Calculate how much crushed stone or aggregate you need by volume (m³/yd³), weight (tonnes/US tons) and cost for driveways, paths and road bases.

Calculate the volume in cubic yards from length, width and depth in feet. Essential for ordering concrete, mulch, topsoil and gravel.

Convert cups to pounds for flour, sugar, butter, honey, water and more. Density varies by ingredient — pick yours for an accurate result.

Convert any text to Unicode Mathematical Script (cursive) characters for use in social media bios, captions and messages.

Calculate how many curtain panels you need for any window by entering the window width, panel width and desired fullness factor.

Calculate the fabric width and drop needed for curtains or drapes from window size, heading style and number of panels.

Estimate total recruiter time for hiring: CV screening, interview rounds, and candidate pass-through rates.

Calculate production cycle time, takt time and throughput rate from available time and units produced — essential for lean manufacturing and process improvement.

Calculate D&D 5e encounter difficulty — adjusted XP, Easy / Medium / Hard / Deadly rating and party XP thresholds by level.

Allocate D&D 5e ability scores using the point-buy system. Shows cost, modifier and points remaining for any 8–15 score array.

Estimate monthly internet data usage from daily streaming, video calls, music, browsing and gaming hours. See a breakdown by activity.

Find your exact age in years, months and days, total days and weeks lived, and a countdown to your next birthday.

Calculate the exact number of days, weeks, months and years between any two calendar dates — forward or backward.

Apply optimal stopping theory to dating: find how many candidates to explore before committing for the best mathematical odds of choosing the best match.

Count the exact days, weeks, and months until any future date — a simple countdown from any start date to a target event, deadline, or holiday.

Count total days, weekdays, weekend days, and occurrences of each day of the week between any two calendar dates.

Calculate the exact number of days between two dates and get a precise breakdown in years, months, and days — plus total weeks and approximate months.

Find out exactly how many days old you are — plus weeks, hours, and minutes — from any birth date to today.

Calculate calendar days, work days (Mon–Fri) and work hours remaining until a deadline, with a progress bar showing how much time has elapsed.

Convert decimal hours to hours:minutes:seconds and back for payroll, timesheets and project tracking.

Calculate how many gallons of deck stain or sealer you need from the deck size, stain type, number of coats and a waste buffer.

Estimate how many decking boards you need from the deck size, board width, board length, gap and a waste allowance — imperial or metric.

Calculate tempo-synced delay and reverb pre-delay times in milliseconds for any BPM, including dotted and triplet note values.

Calculate the depth of field, near and far focus limits, and hyperfocal distance for any lens, aperture, and sensor format.

Find the ideal seated or standing desk height, chair seat height and monitor position based on your body height.

Convert diamond carat weight to grams or milligrams, estimate weight from round-cut dimensions, and get a price estimate from price-per-carat.

Estimate a diamond's weight in carats from its length, width and depth — supports round brilliant, princess, oval, pear and other cuts.

Calculate how much concentrate and water to mix for any dilution ratio and desired total volume.

Find the DIM (volumetric) weight of a parcel and the billable weight that carriers like UPS, FedEx and DHL will charge.

Estimate the material cost to build a DIY shed. Enter dimensions and per-unit material prices to get a cost breakdown by category.

Find the correct door or window header size for a residential framing project using IRC 2021 Table R602.7 for bearing and non-bearing walls.

A lighthearted estimate of how many compatible romantic partners live in your area, using a Drake-equation-style filter chain.

Find your dress size in US, EU and UK sizing from your bust, waist and hip measurements in inches or centimetres.

Estimate your car trip travel time from distance and average speed, with optional stop time, in km or miles.

Estimate how long your drone will fly from battery capacity (mAh), average current draw (A) and usable capacity percentage.

Estimate static thrust, electrical power, and current draw for a drone motor and propeller combination.

Convert dry pasta weight to cooked weight for spaghetti, penne, fusilli and more. Estimates water absorbed and cooked weight per serving.

Estimate drywall sheets, screws, tape and joint compound for a room in feet. Deducts doors and windows; includes 10% waste and an optional material cost.

Calculate duty cycle, frequency, period, ON/OFF time and average voltage for PWM signals — three input modes.

Convert Richter/Mw magnitude to energy in joules and compare two earthquakes by amplitude and energy ratio.

Calculate exactly how long to boil an egg to soft, medium or hard based on egg size, starting temperature and water temperature using a physics heat-conduction formula.

Calculate hours, minutes and exact decimal hours elapsed between any two clock times, including overnight or multi-day spans.

Calculate your electricity bill from kWh consumed, unit rate, daily standing charge and VAT — with an annual cost estimate.

Find the electricity cost of one single use of any appliance from its wattage, usage duration and your per-kWh electricity rate.

Calculate road or trail elevation grade as a percentage, plus the angle in degrees and slope ratio from rise and horizontal run.

Find how many hours per week you spend on back-and-forth email threads and how much time a quick call would save.

Triangulate the Minecraft stronghold / End Portal coordinates from two Eye of Ender throw angles using line-intersection geometry.

Calculate social media engagement rate from likes, comments, shares and saves vs followers — with good/excellent benchmarks per platform.

Convert engine hours to estimated miles driven using average operating speed — for cars, trucks, tractors, heavy equipment, and marine engines.

Estimate how many weeks it takes to reach your target CEFR English level based on your current level and weekly study hours.

Convert shoe sizes between EU, US and UK systems for men and women — includes approximate foot length in cm and inches.

Find the even and odd parity bits for any binary word — count 1-bits, check current parity and generate the error-detection check bit.

Convert any repeating interval — every 5 minutes, every 3 days, every year — into events per second, minute, hour, day and year.

Calculate when an item expires from its start date and shelf life, and see how many days are left or how long it has been past expiry.

Calculate the Exposure Value (EV) for any combination of aperture, shutter speed and ISO, and see what lighting conditions your settings suit.

Estimate the total cost of a fence project: materials, posts, gates and labor. Covers wood, vinyl, chain-link and aluminum.

Estimate fencing project total cost from dimensions and unit prices — posts, panels, rails, concrete, labor and contingency.

Calculate fence material quantities: post, rail and picket lineal meters plus concrete bags needed, with a waste factor.

Calculate total fencing run from plot dimensions: choose how many sides to fence, subtract gate openings and get the linear meters needed.

Calculate the number of fence pickets needed from run length, picket width and gap — plus lineal meters, board feet and privacy coverage.

Calculate fence post burial depth from fence height and frost line, plus total post length and concrete bags needed per hole.

Calculate the needed fire flow (NFF) in gallons per minute for a structure using the Iowa State University formula: NFF = 18 × C × √A.

Calculate how many pounds (or kg) of decorative fire glass you need to fill a gas fire pit or fireplace. Supports rectangle and round pits, inches or centimetres.

Estimate the cosmic radiation dose received during a flight from altitude, duration and route latitude; compare to X-rays and annual limits.

Calculate the Floor Area Ratio (FAR) and plot coverage for a building: total floor area divided by lot area — the core urban-planning density measure.

Calculate the number of floor joists, total linear feet, board feet, and material cost for any rectangular floor frame.

Calculate flooring needed for any room — sq ft with waste, number of boxes, and total material cost for tile, laminate, or hardwood.

Solve the thin-lens equation (1/f = 1/dₒ + 1/dᵢ) for focal length, object distance or image distance, with magnification and image type.

Convert a frame number to SMPTE timecode (HH:MM:SS:FF) at any frame rate: 24, 25, 29.97, 30, 50, 60 fps.

Estimate the number of studs, plates, and total linear feet of lumber for a stud wall at 16" or 24" OC spacing.

Find the NMFC freight class (50–500) from shipment weight and dimensions — density (PCF) determines the LTL rate.

Calculate gravel volume, weight and pipe flow capacity for a French drain trench using Manning's equation.

Convert fresh herbs to dried (or vice versa) using the standard 3:1 ratio. Supports tsp, tbsp, cups, mL and grams.

Calculate real-world fuel consumption from actual trip distance and fuel used. Get L/100km, km/L, US MPG, UK MPG and a CO₂ estimate in one click.

Calculate how far you can drive on the fuel in your tank. Enter litres available and fuel efficiency (km/L) to get your range.

Calculate your vehicle's fuel mileage from a trip. Enter distance driven and fuel used to get km/L, L/100 km and US mpg.

Calculate how many litres of fuel you can pump for a given budget, or how much a target fill-up will cost at the current pump price.

Estimate the furnace size (BTU/hr) you need based on floor area, climate zone, ceiling height, insulation and AFUE efficiency.

Calculate water or liquid flow rate in GPM from a measured volume and the time taken to deliver it. Convert to LPM, GPH and LPH.

Calculate how many US gallons cover each square foot of an area — for irrigation, rainfall, fertilizer or liquid application rates.

Calculate gambrel (barn) roof area, roofing squares and shingle bundles from building length, width and two-slope pitch design.

Find the correct garbage bag size for your trash can — enter can diameter and height (round) or width, depth and height (rectangular) to get the right gallon size and liner dimensions.

Convert garlic between cloves, minced teaspoons, tablespoons, garlic powder, and granulated garlic instantly.

Compare the annual running cost of a gas dryer vs an electric dryer based on your local energy prices and usage.

Calculate the weight of a flat glass pane from its length, width, thickness and glass type (soda-lime, tempered, borosilicate, lead crystal).

Generate glitch (Zalgo) text by stacking Unicode combining diacritical marks above and below each character. Adjust intensity and direction.

Find your glove size from hand circumference. Converts to US (inches), EU (cm) and letter sizes (XS–2XL) for work gloves, latex gloves and fashion gloves.

Convert any text to Gothic Fraktur Unicode characters (𝔞𝔟𝔠…) for use in social media bios, headings and creative text.

Calculate your Pakistani university CGPA from percentage marks using the HEC-recommended 4.0 grading scale.

Calculate your curved grade using four methods: square root curve, flat addition, scale to top score, or mean shift — and see the curve on a chart.

Find the K–12 graduation year for any birthday using your state's kindergarten enrollment cutoff date.

Find your high school graduation year and key school milestones from your current grade level and the current school year.

Convert grams to US cups for flour, sugar, butter, oats, honey and 18 other baking ingredients — with tablespoon and teaspoon equivalents.

Convert grams to US tablespoons for flour, sugar, butter, honey and more — density applied automatically per ingredient.

Convert grams to US teaspoons for salt, baking soda, spices, honey, flour and more — density applied automatically per ingredient.

Calculate how much gravel you need for a driveway or path: volume in m³ and yd³, weight in tonnes and kg, with an optional cost estimate.

Calculate your grocery total from a shopping list with quantities, add sales tax, and compare to a budget in one step.

Calculate the GSD for drone or aerial photography — the real-world size of one image pixel based on altitude, focal length and sensor pixel pitch.

Calculate the tension on a plain guitar or bass string from its diameter, scale length, target pitch frequency and material.

Calculate how many months it takes to grow hair to a target length from a current length, given your personal monthly growth rate.

Find the exact half-birthday 6 calendar months from any date of birth, plus the next annual occurrence.

Calculate the cut square size for half-square triangles in quilting: finished size + 7⁄8 inch, plus total squares and pairs needed.

Calculate how long to cook a ham by weight and type — fresh, fully cooked, or country ham — at 325°F / 163°C.

Calculate the number of parity bits, total codeword length and efficiency for a Hamming SEC or SEC-DED error-correcting code.

Calculate hammock strap length, sag depth and suspension tension from anchor distance, sag angle and occupant weight.

Calculate the partial sum of the harmonic series 1 + 1/2 + 1/3 + … + 1/n and find how many terms are needed to exceed any target value.

Paste any hash string and instantly identify the likely algorithm: MD5, SHA-256, bcrypt, SHA-512 and 15+ more.

Convert head circumference to hat size in US, EU, UK and Japan systems. Enter cm or inches for instant results.

Calculate how much power and voltage your amplifier or phone needs to drive headphones to a target listening level, given sensitivity and impedance.

Find out how much caffeine your daily coffee habit delivers and whether it stays within the safe limit for your health profile.

Calculate steady-state heat loss through a wall, window or roof using U-value, area and indoor–outdoor temperature difference, plus annual energy cost.

Find how many helium balloons are needed to lift any object. Uses Archimedes buoyancy, balloon volume and shell weight.

Convert hexadecimal bytes to readable text (UTF-8) or encode any text string into hex — with byte count and per-byte breakdown.

Calculate how many hexagon pieces you need for a quilt and how much fabric to buy — enter quilt size, hexagon side and seam allowance.

Calculate your weighted high school GPA on the standard 4.0 scale from up to 6 courses with letter grades and credit hours.

Compare the total cost of hiring an experienced professional versus recruiting and training a junior employee over a multi-year period.

Calculate D&D 5th Edition hit points: select your class hit die, character level, and Constitution modifier to see average, maximum and minimum HP.

Calculate the volume of a cylindrical or rectangular hole (fence post, planting pit, trench) plus wall area and total inner surface for lining or cement estimates.

Calculate the number of hoops, total pipe length, and plastic cover area for a semicircular hoop house greenhouse.

Calculate horsepower from torque and RPM using HP = Torque × RPM ÷ 5252. Also converts to kW, metric HP (PS/CV), and watts.

Estimate your hot tub monthly and annual running costs: electricity, water treatments, and refills in one place.

Convert a countdown in hours into days, hours and minutes remaining — plus track progress if some time has already elapsed.

Calculate how many tables you need for a party or event based on guest count, seats per table and an optional head table.

Calculate how many pounds of ham you need per person for a dinner, side dish or party — boneless or bone-in, with an optional buffer.

Find your exact age in years, months, days, weeks and total days — plus the countdown to your next birthday.

Find out exactly how old you were on any past date — in years, months, days, total weeks and total days.

A fun exponential-growth model: how many years until vampires outnumber humans, given a starting count, bite rate, and human growth rate?

Find the hyperfocal distance for any lens and aperture — maximise sharpness from H/2 to infinity for landscape photography.

Calculate total scoops, cost and flavor quantities needed for a party or event. Enter guests, scoops per person, price and optional cone and topping costs.

Calculate your IELTS overall band score from Listening, Reading, Writing, and Speaking sub-scores using the official rounding method.

Calculate the uncompressed size of an image from its pixel dimensions and color depth, with estimated PNG and JPEG file sizes.

Find the simplified aspect ratio of any image (e.g. 16:9), convert between pixel dimensions while preserving the ratio, and see total megapixels.

Calculate a journal's impact factor from citation counts and article numbers for the two prior publication years.

Calculate transformer turns ratio, reflection coefficient, VSWR, return loss and power efficiency for matching source to load impedance.

Convert a finger measurement in inches to US, EU, UK and Japanese ring sizes. Enter circumference or diameter.

Calculate the R-value, U-value and steady-state heat loss for any insulation material, thickness and area.

Convert any IPv4 address to 32-bit binary, hexadecimal, octal and unsigned integer, and look up its class and address type.

Calculate network address, broadcast, subnet mask, host range and usable hosts for any IPv4 CIDR block — enter an IP address and prefix length.

Convert any text to Unicode italic or bold italic characters for social media bios, posts and messages.

Find your jacket or suit size in US, UK, EU, Italian and French sizing from your chest measurement and sleeve length.

Convert waist and inseam measurements to jeans sizes in US W×L, EU, and UK formats for men and women.

Calculate the minimum junction box fill volume required by NEC 314.16(B) for any combination of conductors, grounds, devices and cable clamps.

Calculate sheet metal bend allowance, bend deduction and flat blank length from material thickness, inside radius, bend angle and K-factor.

Identify the major and relative minor key for any key signature with 0–7 sharps or flats, and see which notes are affected.

Convert words per minute (WPM) to keystrokes per hour (KPH) and see where your typing speed ranks among typists.

Calculate your traditional Korean age (세, se) — born at 1, +1 each January 1 — alongside your international and calendar-year age.

Calculate the angle of a ladder against a wall plus required length. Checks the safe 70–78° placement range.

Calculate the great-circle distance between two GPS coordinates in km, miles and nautical miles using the haversine formula.

Calculate total lead time by summing order processing, manufacturing, transit and receiving stages — in days and weeks.

Calculate annual electricity savings, payback period, and 10-year net savings from replacing incandescent or halogen bulbs with LEDs.

Calculate magnification, image distance, and image type for a thin lens from focal length and object distance.

Convert any word or phrase to its A=1 B=2 … Z=26 number values, plus the sum, average, and frequency of each letter.

Calculate how many lumens and light bulbs (or LED fixtures) a room needs based on its size and recommended illuminance level.

Calculate cubic yards, tons, and 50 lb bag count of crushed limestone or agricultural lime for any area and depth.

Add length + width + height to get linear inches — compare your bag or box against typical airline carry-on and checked-luggage size limits.

Calculate flow rate in liters per minute — or solve for volume or time. Converts to L/s, m³/h, and GPM instantly.

Calculate Local Sidereal Time (LST) and Greenwich Mean Sidereal Time (GMST) for any date, UTC time and geographic longitude.

Estimate the weight of a round wood log by diameter, length and species — useful for firewood, timber transport and forestry.

Compute the binary output of any standard logic gate for given inputs and see the full truth table — AND, OR, NOT, NAND, NOR, XOR, XNOR.

Find out how many days it would take YOU to walk Frodo's journey from the Shire to Mount Doom based on your walking pace.

Analyse any poem's line count, syllables, lexical diversity and reading time, and score how closely it matches Louise Glück's spare minimalist style.

Calculate the weight of lumber boards in lbs and kg for 14 wood species, using actual board dimensions and air-dried wood density.

Convert lumens (brightness) to watts for LED, CFL, halogen, and incandescent bulbs, and see the energy and cost savings of switching.

Calculate your age in lunar months and lunar years based on the synodic month (29.53 days), plus your traditional Chinese lunar age approximation.

Find out how many potatoes, how much butter and milk to buy for any number of servings of mashed potatoes.

Calculate how many masks a household or team needs for a set number of days, and compare filtration efficiency by mask type.

Calculate the lay stake and guaranteed profit for matched betting — qualifier bets and free-bet (SNR) conversions at any exchange commission.

Calculate the material removal rate (MRR) for milling, turning or drilling — width × depth × feed rate — and estimate machining time for a given stock volume.

Convert any Gregorian date to the Mayan Long Count, Tzolk'in sacred calendar, and Haab solar calendar using the standard GMT correlation.

Calculate the real cost of a meeting in salary time: attendees × hourly rate × duration, plus weekly and annual totals.

Estimate the cost of a metal roof from your home's footprint area, pitch, metal type, and per-sq-ft material and labour rates (US 2024 estimates).

Calculate the weight of metal plates, round bars, square bars, hex bars, round tubes and square hollow sections in kg and lb from dimensions.

Adjust microwave cooking time for your wattage. Recipe says 1100 W but you have 700 W? Get the corrected time instantly.

Estimate your total annual mileage from daily commute, weekly errands and vacation driving to budget fuel costs and track vehicle wear.

Convert frequent flyer miles or reward points to their dollar value using 2025 program valuations.

Calculate how many blocks you need for a Minecraft circle or disc — ring perimeter blocks and total filled-disc blocks for any diameter.

Calculate how many Minecraft stacks and inventory slots you need for any number of items, including partial stacks and double chests.

Flip and reverse any text into upside-down mirror writing using Unicode character substitution — copy and paste anywhere.

Calculate the miter cut angle for any corner joint or regular polygon frame — for woodworking, picture frames and trim.

Convert millilitres to grams for water, flour, sugar, butter, honey, oil and more. Uses substance density — 1 mL of water = 1 g, 1 mL of flour ≈ 0.53 g.

Estimate the carat weight of a round brilliant diamond from its diameter and depth in millimeters using the standard gemological formula.

Convert finger circumference or inner diameter in mm to US, EU/ISO, UK, and Japanese ring sizes instantly.

Calculate the antimicrobially active molecular SO₂ in wine from free SO₂ and pH, and find the free SO₂ needed to hit a target.

Find how much any dollar amount weighs in grams, kilograms, pounds and ounces — for US bills and coins.

Count the exact number of complete months between any two dates, plus the total in years, weeks and days.

Calculate the exact number of complete months between any two dates, plus the leftover days, total calendar days, and total weeks.

Convert text to Morse code instantly. Supports A–Z, 0–9 and common punctuation marks.

Calculate total playlist or setlist duration from track count and average length, or get exact song-section duration from bars, BPM, and time signature.

Find the musical interval between any two notes: get the semitone distance, interval name (Major 3rd, Perfect 5th, etc.), and consonance classification.

Find all notes in any musical scale: major, minor, pentatonic, modes, and chromatic. Select a root note and scale type to see every note and its position on the chromatic scale.

Transpose any note or key up or down by any number of semitones. Shows the resulting note, interval name, and octave shift — essential for arranging and instrument transposition.

Track your NaNoWriMo progress: enter your goal, days remaining and words written to get your required daily pace and projected total.

Convert any text into the NATO phonetic alphabet (Alpha, Bravo, Charlie …) — useful for spelling out callsigns, codes and names clearly over radio or phone.

Convert nautical miles to kilometres, statute miles, metres, and feet. Calculate travel time at a given speed in knots.

Convert Minecraft Overworld coordinates to Nether coordinates (÷8) so your portals link correctly between dimensions.

Count down the exact days, hours, and minutes until New Year's Day — pick any target year from 1900 to 3000.

Count days until New Year's, track how far through the year a date falls, and monitor progress toward a resolution goal.

Find the frequency in Hz of any musical note across all octaves, with wavelength, period and octave neighbours.

Convert numbers to letters using the A1Z26 code: 1=A, 2=B … 26=Z. Enter a sequence and decode it instantly.

Generate the odd parity bit for a binary word, or verify whether a received word with its parity bit satisfies odd parity for error detection.

Convert between oil and butter for baking and cooking substitutions: 1 cup butter = ¾ cup oil, or 1 cup oil = 1⅓ cup butter.

Estimate how long it takes to read Olga Tokarczuk's novels at your reading speed — from Flights to The Books of Jacob.

Calculate op-amp voltage gain, output voltage and gain in dB for inverting and non-inverting amplifier configurations.

Calculate how many days it takes to watch all Oscar Best Picture nominees (or any film list) at your chosen daily viewing pace.

Calculate how long an oxygen cylinder lasts given tank pressure, cylinder size, and flow rate.

Find palindrome dates for any year — dates whose digit string reads identically forwards and backwards in MM/DD/YYYY, DD/MM/YYYY or YYYY/MM/DD format.

Scale a classic pancake recipe to any number of servings. Get exact ingredient quantities for small, medium or large pancakes.

Calculate how thick a sheet of paper becomes after folding it n times. Each fold doubles the stack — 42 folds theoretically reaches the Moon.

Calculate the weight of a stack of paper from its GSM rating and dimensions. Covers A4, A3, US Letter and custom sizes.

Calculate how much jointing sand you need for a paved area — enter paver size, joint width and depth to get volume and mass.

Calculate PCB trace characteristic impedance for microstrip and stripline geometries using IPC-2141A formulas — FR4 or custom dielectric.

Calculate the maximum current a PCB copper trace can carry before overheating — IPC-2221 formula for external and internal layers.

Calculate PCB copper trace DC resistance, voltage drop and power loss — enter trace length, width, copper weight and operating temperature.

Calculate the minimum PCB copper trace width needed to carry a given current without exceeding a temperature rise — IPC-2221 formula.

Calculate how much pea gravel you need by area and depth. Get the volume in m³/yd³, weight in tonnes, and the number of 0.5 ft³ bags to buy.

Calculate the exact batter ingredients for any number of American-style pancakes at any diameter. Scales flour, milk, eggs and more automatically.

Calculate the exact dough ingredients (flour, water, salt, yeast, oil) for any number of pizzas at any diameter and crust style.

Calculate the annual and lifetime cost of disposable period products and compare savings with reusable alternatives like menstrual cups.

Calculate resistor values for a symmetric Pi (π) attenuator pad — enter attenuation in dB and characteristic impedance.

Calculate mat size, glass area, frame outer size and molding length needed to frame any artwork or photo — in inches or centimetres.

Translate any English text into Pig Latin — consonant clusters move to the end and "ay" is added; vowel-starting words get "way" or "yay".

Calculate the internal volume of a pipe in litres, m³ and US gallons from outer diameter, wall thickness and length.

Calculate the weight of a metal or plastic pipe from outer diameter, wall thickness, length and material density — in kg and lb.

Calculate gear pitch diameter, outside diameter, root diameter and circular pitch from tooth count and diametral pitch or module.

Calculate pixels per inch (PPI) from a pixel count and physical size, or find how many pixels span a given size at a set PPI.

Calculate the physical print size of an image in inches and cm from its pixel dimensions and print DPI.

Compare two pizzas by price per square inch to find the better deal — because a larger pizza is almost always cheaper per bite.

Find out how many pizzas to order for a party based on guest count, appetite and slices per pizza.

Calculate the tip on a pizza order and split the total equally between any number of people.

Calculate the total weight on a barbell from the bar weight and number of plates loaded per side, in kg or lb.

Calculate how long a video or podcast takes at any playback speed — see time saved vs. normal 1× playback.

Calculate the fabric length needed to sew a pleated skirt from waist, length, pleat count and depth.

Calculate how many plywood sheets you need to cover a floor, wall or subfloor — with waste allowance and cost estimate.

Calculate total weekly, monthly and yearly podcast listening time by episode length, frequency and playback speed.

Calculate how many more Pokémon GO candies you need to evolve, plus catches and buddy walking distance required to collect them.

Calculate the expected value (EV) of calling a bet in poker. Compare your pot odds to your equity to find whether a call is profitable.

Calculate your poker draw probability from the number of outs on the flop or turn, with exact odds and the classic rule-of-2/4 shortcut.

Plan your Pomodoro sessions: find how many focused work blocks fit in your available time, with custom break lengths.

Calculate how much pool salt (NaCl) to add to reach the ideal salinity for your salt-chlorine generator.

Calculate exactly how much pool shock (chlorine) to add based on pool volume, current chlorine level, and shock product concentration.

Calculate how many raw kernels (grams, tablespoons, cups) to pop for any number of people, with stovetop, air-popper, and microwave expansion ratios.

Calculate the tube length for a bass-reflex (ported) speaker enclosure using the Helmholtz resonator formula given port diameter, box volume and tuning frequency.

Calculate the volume of concrete and number of pre-mix bags needed to fill a post hole, accounting for the post volume displaced inside the hole.

Convert pounds to US cups for flour, sugar, butter, water, milk, honey and more. Results depend on ingredient density.

Count down to your due date by days and weeks, see your current trimester, and track how far through pregnancy you are.

Calculate price per acre from a total property price and acreage — with automatic conversions to per hectare, per square foot and per square metre.

Calculate price per linear foot (LF) from a total cost and length — with automatic conversion to price per metre and an optional target-length cost.

Find the true cost per ounce of any product — compare grocery items, cleaning supplies or cosmetics by their real unit price.

Calculate the price per pound of any product — great for comparing meat, produce, grains or bulk goods sold by weight.

Calculate the cost per round of ammunition from a box price and round count. Compare bulk packs to find the cheapest cost per cartridge.

Calculate the cost per square inch of any rectangular item — compare pizzas, prints, panels, tiles or any flat surface by true unit area.

Compare food and product prices fairly — convert any price and weight into cost per kg, per lb and per 100 g instantly.

Calculate the exact amount of priming sugar (dextrose, sucrose or DME) needed to carbonate homebrew beer to a target CO₂ volume.

Calculate posts, rails, pickets, and concrete bags needed for a privacy fence, plus a total material cost estimate with editable unit prices.

Calculate projector screen size (diagonal, width, height) from throw distance, throw ratio, and aspect ratio. Works for any projector spec.

Calculate your PTE Academic overall score from Listening, Reading, Speaking and Writing subscores, with CEFR band.

Calculate the punch (blanking) force and minimum press tonnage needed to punch holes in sheet metal or other materials.

Calculate the total number of blocks or stones needed to build a square stepped pyramid of any base size and step reduction.

Find out how many books you can read during quarantine — enter days, daily reading hours, speed and book length to get a realistic reading total.

Calculate how much food and water to stockpile for a quarantine or emergency, broken down by food group and calorie needs.

Calculate how much binding fabric and how many strips you need to finish a quilt — enter size and binding width.

See how much money you save by quitting smoking — weekly, monthly and yearly — plus your estimated lifetime tobacco spend.

Calculate common rafter length from building span and roof pitch using the Pythagorean theorem, with optional eave overhang.

Convert a rainfall depth to its snowfall equivalent using the snow-to-liquid ratio (standard 10:1, adjustable for snow density).

Calculate the total volume of water falling on an area from rainfall depth and catchment dimensions (m² × mm = litres).

Convert RAM CAS latency cycles to real nanoseconds using the DDR transfer rate, so you can compare kits on equal footing.

Calculate ramp slope percentage, angle in degrees, ramp surface length, and rise-to-run ratio from vertical rise and horizontal run.

Calculate how long it will take to read a text or book given your reading speed in words per minute (WPM) and the word count.

Calculate how many recessed (can) lights you need for any room based on size, ceiling height, room type, and fixture lumens.

Calculate the reorder point (ROP) for inventory management: lead-time demand plus safety stock, so you never run out of stock.

Calculate the scale factor between two display resolutions, check pixel density (PPI), pixel count ratio, and whether aspect ratios match.

Calculate the active lateral earth pressure and total force on a retaining wall using the Rankine method — enter wall height, soil weight, friction angle, and surcharge.

Count the exact days, months and years remaining until your planned retirement date based on your birth year and target retirement age.

Instantly reverse any text character-by-character or flip the word order, with character-count and composition stats.

Calculate start time from end time and duration, or end time from start and duration — with clock display and 24-hour format.

Convert RF power between dBm, milliwatts, dBW, watts, dBμV and microvolts. Instant conversion with 50 Ω load assumption for voltage units.

Calculate the exact water-to-rice ratio for white, brown, basmati, jasmine, sushi, wild, and arborio rice — in cups, grams, or mL.

Convert a finger measurement to ring sizes in EU, US, UK and Japan standards from inner circumference or diameter.

Calculate the volume and weight of rip-rap (angular erosion-control stone) needed for a bank, slope or channel protection project.

Calculate how much river rock (smooth landscaping stone) you need by volume and weight for a garden, path or drainage bed.

Find the correct rivet diameter, body length and drill hole size for blind (pop) or solid rivets based on total material thickness.

Calculate the cubic metres and tonnes of road base (crushed aggregate) needed for a driveway, path or sub-base, with a compaction factor.

Calculate the total length of material wound on a roll from outer diameter, core diameter and material thickness.

Calculate the true (rolling) offset, travel and run for a pipe or conduit that must change both height and direction simultaneously.

Calculate roof pitch angle, slope factor and rafter length from rise and run; enter building span for the actual rafter cut length.

Calculate the exact number of individual shingles and bundles needed from roof area, shingle size, exposure, and waste.

Calculate rafter length, peak rise, pitch angle and pitch factor from building span and roof pitch for truss design.

Estimate all roofing materials: squares of shingles, underlayment rolls, ridge cap bundles, starter strip and drip edge from building dimensions and pitch.

Calculate how many panels you need to build a round horse pen, the total fencing length, enclosed area and optional material cost.

Calculate rounds per minute (RPM) from a count and time, or convert RPM to time between rounds, rounds per second, and rounds per hour.

Find the recommended rug size for a living room, dining room, or bedroom from room and furniture dimensions, with the nearest standard rug size.

Estimate how much steel or iron has corroded over time and when it will rust through, based on ISO 9224 environment corrosion rates.

Count the calories in your salad ingredient by ingredient — greens, protein, cheese, dressing and more — using standard USDA calorie densities.

Scale the classic 2:1:1 salt dough recipe by batch count — get exact flour, salt and water amounts in cups or grams.

Calculate how many litres of play sand you need for a sandbox, plus total weight and the number of standard bags to buy.

Add your SAT Math and EBRW section scores to get your composite score (400–1600) and an approximate national percentile.

Calculate the aspect ratio, pixel diagonal, megapixels, PPI and pixel pitch of any screen from its resolution and optional physical size.

Calculate how many tubes of sealant or caulk you need to fill a gap or joint — by length, width, depth and tube size.

Convert all-purpose flour to self-rising flour: find the exact baking powder and salt to add per cup.

Calculate your weighted semester grade average across up to 5 courses weighted by credit hours.

Calculate semitones between two frequencies, or find the target frequency a given number of semitones away.

Convert any text to sentence case: first letter of each sentence capitalised, everything else lowercase. Handles "I" and multi-sentence paragraphs.

Calculate how many shiplap boards you need for a wall. Enter wall size, board length and exposure width to get board count, rows and linear footage with waste.

Convert shoe sizes between US Men's, US Women's, UK, EU (European), Japan and foot length in cm.

Calculate the correct shoelace length for criss-cross, straight or display lacing from eyelet count, shoe width and row spacing.

Calculate the water and energy cost of a shower from duration, flow rate, and your local utility prices.

Calculate the correct shutter speed from aperture, ISO and scene brightness (EV). Covers sunny through candlelight conditions.

Calculate one-way and round-trip signal propagation delay for fiber, coaxial cable, twisted pair and vacuum. Results in ns, µs or ms.

Quantify the benefits hidden in a setback. Enter the loss and up to 3 silver lining benefits to find how much of the negative is offset.

Calculate the weight of any rectangular box or block from its length, width and height, using standard material densities or a custom value.

Calculate total slack (float) for a project activity from Early Start, Early Finish and Late Finish — identifies critical-path activities.

Convert any text to Unicode small capital letters instantly. Paste into social media, documents or websites — no font needed.

Convert normal text to Unicode small caps, superscript, or subscript characters — copy the tiny text instantly.

Calculate the snow load on a roof in pounds and psf using the ASCE 7 simplified method — enter snow depth, type, roof area, and slope.

Calculate how much snow you need to build a snowman: total volume in litres and weight in kg for three stacked spheres.

Estimate the hours, financial value, books, workouts and kilometres you gain from a social media ban or digital detox.

See what you could achieve with the time you spend on social media: books read, workouts completed, languages learned, and films watched.

Find your sock size in EU, UK and US systems from foot length in cm — with size-range indicator and instant cross-system conversion.

Estimate how many socks disappear in the laundry each year, your annual replacement cost, and your personal Socks Loss Index score (0–10).

Find the ideal sofa length and depth for your room: enter dimensions and seats needed to get recommendations that keep traffic clearance.

Calculate the concrete volume and bags needed to fill a sonotube (cylindrical cardboard form) for footings, fence posts and columns.

Calculate flour, water, starter and salt weights for any sourdough loaf using baker's percentages.