Unit Converters

Convert area between square meters, square feet, acres, hectares, square miles, square kilometers and more — instantly and accurately.

Convert between major world currencies with live, daily-updated exchange rates.

Convert density between kg/m3, g/cm3, g/ml, kg/L, lb/ft3 and lb/in3 quickly and accurately for science and engineering.

Convert Bulgarian leva to euro (and back) at the official irrevocably fixed changeover rate of 1 EUR = 1.95583 BGN, with the legally required rounding.

Convert power between watts, kilowatts, megawatts, horsepower, metric horsepower, BTU per hour and foot-pounds per second.

Convert numbers to Roman numerals and Roman numerals back to numbers (1–3999), in both directions, using the standard subtractive notation rules.

Convert m/s, km/h, mph, knots and feet per second quickly and accurately.

Convert Celsius, Fahrenheit, Kelvin and Rankine instantly with exact formulas.

Convert volume between liters, milliliters, cubic meters, US gallons, quarts, pints, cups, fluid ounces, tablespoons and imperial gallons.

Calculate the acreage of a rectangular, triangular or circular plot from its dimensions, with results in acres, sq ft, sq m and hectares.

Convert angles between degrees, radians, gradians, arcminutes, arcseconds and turns — instantly and precisely.

Convert atmospheres (atm) to pascal, kPa, bar, psi, mmHg, Torr, inHg and millibar — or convert any pressure unit to atm.

Estimate the size of data after Base64 encoding, including the ~33% overhead and optional line-break/data-URI padding.

Convert a decimal number to packed binary-coded decimal and back, encoding each digit as its own 4-bit nibble.

Convert any non-negative integer between binary (base 2), octal (base 8), decimal (base 10) and hexadecimal (base 16) instantly.

Convert digital data sizes between bits, bytes, KB, MB, GB, TB and binary KiB, MiB, GiB, TiB — with the decimal vs binary difference explained.

Convert centimeters to inches, feet, meters, millimeters, yards and miles instantly with a full reference table.

Convert an RGB color (0–255 per channel) to HEX, HSL, HSV and CMYK — with a live color preview swatch.

Convert cooking measurements between teaspoons, tablespoons, fluid ounces, cups, pints, quarts, milliliters and liters.

Convert typing speed between characters per second (CPS), words per minute (WPM), CPM, and keystrokes per hour (KPH).

Calculate cubic feet from length, width and height in feet. Instantly converts to cubic yards, cubic inches, cubic meters, liters and US gallons.

Calculate cubic meters from length, width and height in meters. Converts to liters, cubic feet, cubic inches, cubic centimeters and gallons.

Convert bytes, KB, MB, GB, TB and binary KiB, MiB, GiB units accurately.

Convert data transfer rates between bits per second, kbit/s, Mbit/s, Gbit/s and bytes, KB/s, MB/s, GB/s instantly.

Compute real-world transfer time for a dataset over a link, factoring protocol/overhead efficiency to get effective throughput.

Convert days to seconds, minutes, hours, weeks, months and years — and back. Uses exact hour/minute/second factors and a 365.25-day average year.

Convert decimetres (dm) to and from millimetres, centimetres, metres, kilometres, inches, feet, yards, and miles.

Estimate how long a file takes to download from its size and your connection speed, with a clean hh:mm:ss result.

Swap the byte order of a 16/32/64-bit hex value to convert between big-endian and little-endian.

Convert energy between joules, kilojoules, calories, kilocalories, watt-hours, kilowatt-hours, BTU, foot-pounds and electronvolts.

Convert Fahrenheit to Celsius, Kelvin and Rankine instantly with exact formulas and a visual temperature scale.

Convert feet to meters, inches, centimeters, millimeters, yards, miles, kilometers, and nautical miles instantly with exact values.

Convert force between newtons, kilonewtons, dynes, pound-force, kilogram-force and ounce-force quickly and accurately.

Convert frequency between hertz, kilohertz, megahertz, gigahertz, terahertz and revolutions per minute (rpm) instantly.

Convert fuel economy between L/100km, kilometers per liter, US miles per gallon and UK miles per gallon accurately.

Convert US liquid, US dry or Imperial gallons to litres, millilitres, quarts, pints, cups, fluid ounces and cubic units.

Convert any English word or phrase to a gematria number value using Simple (A=1–Z=26), Reverse, or Reduced systems.

Convert between standard binary and reflected Gray code, where adjacent values differ by exactly one bit.

Calculate the isopsephy (Greek gematria) value of any Greek word or phrase. Each letter maps to its Milesian numeral: Α=1, Ι=10, Ρ=100, Ω=800 and so on.

Convert height between centimetres and feet & inches. Switch direction to go cm → ft/in or ft/in → cm, with the value in metres. Free, instant and accurate.

Convert a hex color code (#RGB or #RRGGBB) into red, green and blue channel values and a CSS rgb() string.

Convert hours to minutes, seconds, milliseconds, days, weeks, months and years instantly. Supports decimal hours (e.g. 1.5 h).

Break a decimal number into IEEE-754 sign, exponent, and mantissa bits for 32-bit (single) and 64-bit (double) precision.

Convert between imperial (inches, feet, pounds, gallons, °F) and metric units instantly — all four measurement types in one tool.

Convert inches to millimetres, centimetres, metres, feet, yards and miles instantly using exact SI definitions.

Convert kilometres to miles, metres, feet, yards, inches, nautical miles and light-years — or convert any distance to kilometres.

Convert kilopascals (kPa) to pascals, MPa, bar, atm, psi, mmHg, Torr, inHg and mbar — or convert any pressure unit to kPa.

Convert land area between acres, hectares, square meters, square feet, sq km, sq miles, rai, cents and marla instantly.

Convert normal text into leet speak (1337) by substituting letters with numbers and symbols — basic or advanced mode.

Convert between meters, kilometers, miles, feet, inches, yards and more — instantly and accurately.

Convert between litres, cubic centimetres (cc), millilitres and US gallons — plus fl oz and cups in one step.

Convert Mbps to MB/s, KB/s and Gbps, and calculate how long it takes to download or upload any file at your speed.

Convert mils (thousandths of an inch) to micrometers, millimeters, centimeters, meters and inches instantly.

Convert miles to kilometers, meters, feet, yards, nautical miles and centimeters instantly with exact international conversion factors.

Convert millimeters to inches, centimeters, meters, micrometers, feet, yards and miles instantly with exact conversion factors.

Convert inches, feet, yards, centimeters, meters, kilometers or micrometers to millimeters instantly with exact conversion factors.

Convert megapascals (MPa) to psi, bar, kPa, atm, GPa, Torr, mmHg and more — or convert any pressure unit to MPa.

Convert torque between Newton-meters, foot-pounds, inch-pounds, kgf·m and Newton-centimeters instantly.

Convert nanometres to micrometres, millimetres, metres, angstroms and picometres — or convert any of those back to nm.

Convert any whole number between binary, octal, decimal and hexadecimal. Enter a value, pick its base, and see all four representations instantly.

Calculate how many sheets of paper and reams to buy for a print job — supports duplex printing and multiple paper sizes.

Convert pounds and ounces to kilograms, grams, stones and total ounces. Enter lb + oz together for a combined weight.

Convert parts per million (ppm) to ppb, ppt, percent, per mille, mg/kg, mg/L and μg/L — and back from any of those units.

Convert pressure between pascals, kilopascals, megapascals, bar, psi, atmospheres, mmHg and torr — fast and accurate.

Convert PSI (pounds per square inch) to bar, kPa, MPa, Pa, atm, mmHg, inHg, Torr and psf — or convert any pressure unit back to psi.

Turn red, green and blue values (0-255) into a #RRGGBB hex code plus a ready-to-use CSS rgb() string.

Convert RGB color channels into HSL (hue degrees, saturation and lightness percent) for easier color tweaking.

Convert time between nanoseconds, microseconds, milliseconds, seconds, minutes, hours, days, weeks, months and years instantly.

Convert torque between newton-meters, kilonewton-meters, pound-feet, pound-inches and kilogram-force-meters accurately.

Convert any text to Unicode code points (U+XXXX hex, decimal or binary) and see the UTF-8 byte count, character count and script distribution.

Convert a Unix timestamp (seconds since 1970-01-01 UTC) to a human-readable UTC date and time, and see days, weeks, and years elapsed.

Estimate a video file's size from its bitrate and duration (with optional audio track), or solve for bitrate.

Check the contrast ratio between two hex colors and whether it passes WCAG AA/AAA for normal and large text.

Convert kilograms, grams, pounds, ounces, stones and tonnes quickly and accurately.

Convert any distance to obscure and unusual units: smoots, cubits, furlongs, hands, fathoms, chains, leagues and light years.

Convert yards to metres, centimetres, feet, inches, miles, furlongs and more using exact 1959 SI definitions.