Everyday

Calculate the sale price and how much you save with any percentage discount.

Calculate an appliance's energy use in kWh and its running cost from wattage, hours per day, days and your per-kWh electricity rate.

Find out exactly what score you need on your final exam to reach your target grade, based on your current grade and the exam weight.

Add or remove GST at 5%, 12%, 18% or 28% and instantly see the net amount, the GST charged and the gross total.

Work out how many litres of paint you need from your wall area, the paint's coverage per litre and the number of coats.

Calculate the area of a rectangular room or space in square feet and square metres from its length and width, plus an optional total material cost.

Work out the tip, total bill and amount per person — perfect for splitting a restaurant bill.

Work out the aspect ratio of any size and find a missing width or height that keeps proportions.

Estimate how many bricks or blocks and how much mortar a wall needs from wall area and brick size, minus openings.

Calculate carpet area and linear metres needed from a fixed broadloom width, with waste for matching and offcuts.

Add up what your daily coffee habit really costs per week, month and year.

Get the perfect coffee-to-water ratio in grams for any brew strength or number of cups.

Estimate concrete for a slab from length, width and thickness in metric or imperial units. Get the volume in cubic yards and cubic metres, plus 40, 60 and 80 lb bag counts.

Find how much each serving of a meal costs from the total price and number of servings.

See the true cost per use of any purchase based on price and how often you use it.

Roll any number of dice with any number of sides (NdM) and see each die plus the total.

Calculate drywall sheets, screws, joint compound and tape for a room from wall and ceiling area.

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.

Split a shared bill including tax and tip evenly among any number of people.

Calculate board feet and total cost for lumber from thickness, width, length and quantity.

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.

Find how many minutes of walking, running, cycling or swimming burns a given number of calories.

Recommend the right ceiling fan blade span for a room based on its floor area, with a downrod height tip.

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.

Estimate the daily, monthly and yearly cost of driving to work including fuel, tolls and parking.

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.

Estimate decking boards, joists and fasteners for a deck from its size, board width and joist spacing.

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.

Calculate print DPI from image pixels and size, or the pixels needed for a sharp print.

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.

Calculate fence posts, panels, rails and pickets for a run of fencing from total length and spacing.

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

Convert a stacked woodpile into cords and face cords from length, width and height, and check value per cord.

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.

Estimate the fuel cost of any trip from distance, vehicle efficiency and fuel price, plus litres needed and cost per kilometre.

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

Size a backup generator by summing the running and starting watts of the appliances you want to power.

Split a holiday or event gift budget fairly across everyone on your list.

Calculate your grade point average from each course's grade points and credit hours — a fast, accurate weighted GPA in seconds.

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.

Work out how much grass seed to buy for a new lawn or overseeding, based on area and the recommended seeding rate.

Work out how much gravel or aggregate you need from length, width and depth — get the volume in m³ and yd³, the weight in tonnes and US tons, and the cost.

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.

Convert an IPv4 address to its 32-bit decimal integer (and hex/binary), or convert an integer back to dotted-quad form.

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

Estimate how many laminate or hardwood floor packs and planks you need for a room, including a cutting-waste allowance.

Work out how much fertilizer to apply for a target nitrogen rate using the NPK percentage on the bag.

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

Pick random lottery numbers (e.g. 6 from 49) with no repeats, plus an optional bonus ball.

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.

Estimate thin-set mortar and tile grout for a tiling job from area, tile size and joint width.

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.

Find how many cubic yards or bags of mulch you need from bed length, width and depth, with bag-count and volume.

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.

Plan how much food, drink and ice to buy for a party based on guests and length.

Estimate password strength in bits of entropy and approximate crack time from its length and character set.

Generate a strong random password and measure its strength as entropy in bits.

Find how many pavers and how much bedding sand a patio or path needs from area and paver size.

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.

Calculate a display's pixels-per-inch and dot pitch from its resolution and diagonal size.

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

Draw one or more random winners from a list of entries, with optional weighted tickets.

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.

Generate a random color and get its HEX, RGB and HSL codes instantly.

Generate one or many random integers within any range you choose — great for draws, picks, games, sampling and quick decisions.

Shuffle a list of names into balanced random teams of nearly equal size.

Estimate how long a text takes to read from its word count and your reading speed.

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.

Double, triple or halve any recipe instantly by scaling every ingredient to your desired number of servings.

Estimate roofing squares and shingle bundles from roof footprint and pitch, including waste for ridges and cuts.

Size an air conditioner or heater in BTU for a room from its area, sun exposure, ceiling height and occupants.

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.

Convert a screen's diagonal size and aspect ratio into its real width, height and area.

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.

Calculate how many sod rolls or pallets you need to cover a lawn, including a waste allowance for trimming.

Calculate stair risers, treads and stringer length from total rise, checking the 2R+T comfort rule.

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.

Enter an IPv4 address and prefix (CIDR) to get the network address, broadcast, usable host range, host count and subnet mask.

Total up all your streaming and app subscriptions into one monthly and yearly figure.

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.

Find how many tiles you need for a floor from the room area and tile size, with a waste allowance for cuts and breakages.

Estimate topsoil volume, weight and bag count for a garden bed or lawn from area and fill depth.

Estimate the full cost of owning a car or appliance including running costs and resale value.

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.

Calculate your typing speed in words per minute plus net WPM and accuracy from a timed test.

Compare two products by price per unit to find the cheaper buy — beat misleading package sizes and pick the best value every time.

Convert an availability SLA percentage (like 99.9%) into the allowed downtime per day, week, month and year.

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

Work out how many wallpaper rolls you need from room dimensions, roll size and pattern repeat, with trim and waste built in.

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

Find the ramp length and slope needed for a given rise and check it against the ADA 1:12 maximum.

Let chance decide: get a random Yes or No with adjustable odds and see the probability split.