Unit Converters
Convert between metric, imperial and scientific units in one step. Each converter shows the result as you type, lists every supported unit and explains the formula behind it.
Essentials
Length Converter
Convert length and distance units instantly: centimeters, inches, feet, meters…
Weight and Mass Converter
Convert weight and mass units: kilograms, pounds, ounces, grams, stone, tons, carats…
Temperature Converter
Convert temperature between Celsius, Fahrenheit, Kelvin, Rankine and Réaumur. Instant…
Volume Converter
Convert volume and capacity units: liters, milliliters, US and UK gallons, cups, fluid…
Area Converter
Convert area units: square meters, square feet, acres, hectares, square kilometers…
Time Converter
Convert time units: seconds, minutes, hours, days, weeks, months, years, milliseconds…
Currency Converter
Convert between 160+ world currencies with daily updated exchange rates: USD, EUR, GBP…
Motion & Mechanics
Speed Converter
Convert speed units: miles per hour, kilometers per hour, meters per second, knots, feet…
Fuel Economy Converter
Convert fuel consumption between miles per gallon (US and UK), liters per 100 km and…
Acceleration Converter
Convert acceleration units: meters per second squared, standard gravity (g), feet per…
Force Converter
Convert force units: newtons, kilonewtons, pound-force, kilogram-force, dynes, kips and…
Torque Converter
Convert torque units: newton-meters, foot-pounds, inch-pounds, kilogram-force meters and…
Pressure Converter
Convert pressure units: psi, bar, kilopascals, pascals, atmospheres, mmHg, inHg, torr…
Energy & Power
Energy Converter
Convert energy units: joules, kilojoules, calories, kilocalories, kilowatt-hours, BTU…
Power Converter
Convert power units: watts, kilowatts, megawatts, horsepower (mechanical and metric)…
Electric Charge Converter
Convert electric charge units: coulombs, milliamp-hours, amp-hours, microcoulombs…
Voltage Converter
Convert voltage units: volts, millivolts, microvolts, kilovolts, megavolts, abvolts and…
Electric Current Converter
Convert electric current units: amperes, milliamperes, microamperes, kiloamperes…
Electrical Resistance Converter
Convert electrical resistance units: ohms, milliohms, kilohms, megohms, gigohms, abohms…
Scientific
Density Converter
Convert density units: kilograms per cubic meter, grams per cubic centimeter, pounds per…
Frequency Converter
Convert frequency units: hertz, kilohertz, megahertz, gigahertz, revolutions per minute…
Angle Converter
Convert angle units: degrees, radians, gradians, arcminutes, arcseconds, turns and mils.…
Concentration Converter
Convert mass concentration units: mg/L, g/L, ppm, ppb, mg/dL, µg/mL, percent w/v and…
Metric Prefix Converter
Convert between metric (SI) prefixes: kilo, mega, giga, milli, micro, nano, pico and all…
Illuminance Converter
Convert illuminance units: lux, foot-candles, phot, nox and lumens per square meter or…
Flow Rate Converter
Convert volumetric flow rate units: liters per minute, gallons per minute, cubic meters…
Digital & Media
Data Storage Converter
Convert data storage units: bits, bytes, KB, MB, GB, TB, PB and binary units KiB, MiB…
Data Transfer Rate Converter
Convert data transfer rates: Mbps, MB/s, Gbps, kbps, MiB/s and more. See what your…
Image Resolution Converter
Convert image and print resolution units: DPI, PPI, dots per centimeter, dots per…
Typography Unit Converter
Convert typography units: pixels, points, picas, em, rem, inches, millimeters and twips.…
Sound Level Converter
Convert sound level units: decibels, bels, nepers and centibels. Free instant converter…
Number Base Converter
Convert numbers between binary, decimal, hexadecimal, octal and any base from 2 to 36.…
Specialized Physics
Heat Transfer Coefficient Converter
Convert heat transfer coefficient (U-value) units: W/(m²·K), BTU/(h·ft²·°F)…
Viscosity Converter
Convert dynamic viscosity units: centipoise, pascal-seconds, millipascal-seconds, poise…
Surface Tension Converter
Convert surface tension units: newtons per meter, millinewtons per meter, dynes per…
Permeability Converter
Convert permeability units for porous media: darcy, millidarcy, microdarcy, square…
Magnetic Field Converter
Convert magnetic flux density units: tesla, gauss, millitesla, microtesla, nanotesla…
Radiation Converter
Convert radiation units: sieverts and rem, grays and rad, becquerels and curies…
More unit tools
Custom Unit Converter
Create your own units with custom conversion factors and convert between them. Ideal for…
Units Museum
Explore historic and unusual units of measurement: cubit, league, furlong, stone, tola…
Units Duel Game
Test your unit sense in a quick game. Two measurements appear: pick the bigger one.…