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Free Unit Converter

Length, weight, temperature, volume, speed, data and more — fast, accurate, no signup.

Length

m → kmm → cmm → mmm → mi

e.g. 1 Meter to Kilometer

Mass

kg → gkg → mgkg → tkg → lb

e.g. 1 Kilogram to Gram

Volume

L → mLL → m³L → galL → qt

e.g. 1 Liter to Milliliter

Temperature

°C → °F°C → K

e.g. 1 Celsius to Fahrenheit

Area

m² → km²m² → cm²m² → ham² → mi²

e.g. 1 Square meter to Square kilometer

Speed

m/s → km/hm/s → mphm/s → knm/s → ft/s

e.g. 1 Meter per second to Kilometer per hour

Digital storage

b → Bb → KBb → MBb → GB

e.g. 1 Bit to Byte

Time

s → mss → mins → hrs → d

e.g. 1 Second to Millisecond

Number tools

Number to wordsRoman numeralsDecimal to hexDecimal to binary

About the unit converter

Convert between units of length, weight, temperature, volume, speed, data and more. Every category links to pages for each unit pair, each with a common-values table and the option to convert any other number. Free, with no signup.

How to use it

  1. Find the category you need, such as length or temperature.
  2. Click a unit pair, or the example conversion under the category.
  3. On the pair page, enter a different number to convert it.
  4. Use the common-values table for quick lookups, or jump to other units in the same category.

Questions

How do I convert between metric and imperial units?
Pick the category, then the pair, for example centimetres to inches. Each pair page shows the result for your number and a table of common values.
How do I convert Celsius to Fahrenheit?
Multiply by 9/5 and add 32. For example, 20 °C × 9/5 + 32 = 68 °F.
How many bytes are in a kilobyte?
Under SI units a kilobyte (kB) is 1,000 bytes, while a kibibyte (KiB) is 1,024 bytes. Some software still uses KB to mean 1,024.