Converters

Convert m/s², g-force, ft/s², and rates of speed change like km/h per second.

Convert degrees, radians, gradians, turns, arcminutes, arcseconds and mils.

Convert square metres, square feet, acres, hectares and more.

Convert between astronomical units, light-years, parsecs, lunar distances and kilometres, with the exact definitions marked.

Swap one baking pan for another by volume, with the factor to multiply the recipe by and how the batter depth changes.

Convert one colour between hex, RGB, HSL, HSV and CMYK, with hue-rotated sets alongside.

Convert cups, spoons, grams and ounces for real ingredients, using their actual density.

Convert oven temperatures between Celsius, Fahrenheit, gas mark and fan settings.

Convert px, rem, em, pt, %, vw and vh against a root font size you set.

Convert amperes, milliamps, microamps, kiloamps and CGS current units.

Convert bytes, KB, MB, GB and TB — with binary and decimal units kept separate.

Convert Mbps to MB/s and between every bit, byte, decimal and binary rate unit.

Convert kg/m³, g/cm³, lb/ft³, lb/gal and other density units.

Convert coulombs, amp-hours, milliamp-hours, faradays and elementary charges.

Convert joules, kilowatt-hours, calories, BTU, therms, electronvolts and more.

Convert volumetric flow between litres per minute, cubic metres per hour, GPM, CFM and more.

Convert newtons, kilogram-force, pound-force, dynes, kips and poundals.

Convert hertz, kilohertz, megahertz, gigahertz, RPM, rad/s and BPM.

Convert between mpg, L/100km and km/L — including the US and imperial gallon difference.

Convert a coordinate between decimal degrees, degrees-minutes-seconds and decimal minutes.

Convert paper and fabric weight between g/m², oz/yd² and the US basis weights, where a pound means something different in every grade.

Convert lux, foot-candles, phots and other units of light falling on a surface.

Convert between millimetres, metres, kilometres, inches, feet, yards and miles.

Convert magnetic flux density in tesla and gauss, or magnetic flux in webers and maxwells.

Work out molar mass from a chemical formula, then convert between grams and moles.

Convert between binary, octal, decimal, hexadecimal and any base from 2 to 36.

Write numbers out in words, in the international or Indian numbering system.

Every standard sheet size in millimetres, inches, points and pixels at the DPI you choose.

Convert watts, kilowatts, horsepower, BTU per hour and tons of refrigeration.

Convert ppm, ppb, percent, per mille, mg/kg and mg/L concentration units.

Convert between bar, psi, pascal, atmosphere, mmHg and eleven other pressure units.

Convert sieverts, grays, becquerels, curies and rem — each within its own quantity.

Convert ohms, milliohms, kilohms, megohms, gigohms and CGS resistance units.

Convert ring sizes between US, UK, EU and Japanese scales, or from a measured circumference.

Convert numbers to Roman numerals and back, with the subtractive rules enforced.

Convert between standard, scientific and engineering notation, with significant figures handled properly.

Convert between UK, US, EU and Japanese shoe sizes, worked from foot length rather than a copied chart.

Convert km/h, mph, m/s, knots and Mach.

Convert between Celsius, Fahrenheit and Kelvin instantly.

Convert text to binary, octal, decimal or hex and back, as UTF-8 bytes or code points.

Convert thermal conductivity between W/(m·K), the two BTU forms and the calorie units, with every factor derived from exact definitions.

Convert seconds, minutes, hours, days, weeks, months and years.

Convert a date and time between any two cities, with daylight saving handled for that date.

Convert newton metres, pound-force feet, kilogram-force metres and inch-pounds.

Convert dynamic viscosity in Pa·s, poise and reyn, or kinematic viscosity in m²/s and stokes.

Convert volts, millivolts, microvolts, kilovolts, megavolts and CGS units.

Convert litres, millilitres, cubic metres, gallons, pints and cups.

Convert grams, kilograms, tonnes, ounces, pounds and stones in one step.

Convert AWG to millimetres and mm², both ways, with resistance per kilometre.