Unit Converter
This unit converter converts values across eight categories — length, weight, temperature, speed, data storage, area, volume and time — and lists the value in every unit of the category at once.
About this tool
This unit converter converts values across eight categories — length, weight, temperature, speed, data storage, area, volume and time — and lists the value in every unit of the category at once.
How to use it
- Choose a category, such as Length or Temperature.
- Enter a value and pick the units to convert from and to.
- Read the result, use Swap to reverse it, or copy it; all other units are listed below.
Good to know
- Length uses exact definitions: 1 inch = 2.54 cm, 1 foot = 0.3048 m, 1 mile = 1,609.344 m, 1 nautical mile = 1,852 m.
- Temperature: °F = °C × 9/5 + 32, and K = °C + 273.15.
- Data storage uses binary multiples: 1 KB = 1,024 bytes and 1 MB = 1,048,576 bytes.
- Volume uses US units: 1 US gallon = 3.78541 L and 1 US cup = 0.236588 L.
- Weight: 1 lb = 0.453592 kg, 1 oz = 28.3495 g and 1 stone = 6.35029 kg.
Runs entirely in your browser — nothing you enter is uploaded or stored.
Frequently asked questions
How do I convert Celsius to Fahrenheit?
Multiply by 9/5 and add 32. For example, 20 °C is 20 × 1.8 + 32 = 68 °F.
How many centimetres are in an inch?
Exactly 2.54 cm. A foot is 30.48 cm and a mile is 1.609344 km.
Is 1 KB 1,000 or 1,024 bytes?
Both conventions exist. This converter uses the binary convention, where 1 KB = 1,024 bytes and 1 MB = 1,024 KB.
Are gallons and cups US or UK units?
They are US customary units: 1 US gallon is 3.785 litres. A UK (imperial) gallon is larger, about 4.546 litres.