Recipes from the US use cups and ounces, UK road signs use miles, German specs use centimetres and kilograms, and Australian weather is in Celsius. This free unit converter takes the guesswork out of switching between them. Pick a category (length, weight and mass, temperature, volume, area, speed or digital storage), type a value, and choose the units to convert from and to. Below the main answer you'll also see the same value in every other unit in that category at once, which is handy when you're not sure which unit you need. We're careful with the details that trip people up: US gallons and UK (imperial) gallons are different sizes, US and UK fluid ounces differ too, temperature conversions use offsets rather than simple multiplication, and storage sizes are shown in both decimal (MB, GB, as used by drive makers) and binary (MiB, GiB, as used by many operating systems). All conversion factors are the exact internationally agreed definitions, for example 1 inch = 2.54 cm and 1 lb = 0.45359237 kg. The converter works offline in your browser, on any phone or computer.
Convert units
In every unit
How to use the unit converter
- Choose a category.
- Enter a value and pick the from and to units.
- Use Swap to reverse the conversion, or read the full table below.
Handy conversions
| 1 inch | 2.54 cm |
| 1 mile | 1.609344 km |
| 1 kg | 2.20462 lb |
| 1 stone (UK) | 6.35029 kg |
| 0 °C | 32 °F |
| 1 US gallon | 3.78541 L |
| 1 UK gallon | 4.54609 L |
FAQ
Why are US and UK gallons different?
The UK imperial gallon (4.546 L) was defined in 1824 by the weight of water; the US gallon (3.785 L) comes from an older wine gallon. Pints and fluid ounces differ too.
How do I convert Celsius to Fahrenheit?
°F = °C × 9/5 + 32, and °C = (°F − 32) × 5/9. Choose Temperature to do it instantly.
Why does my 1 TB drive show about 931 GB?
Drive makers use decimal units (1 TB = 10¹² bytes), while Windows reports binary units (GiB). 10¹² bytes ≈ 931 GiB.
Are cooking cups included?
Yes, US cups are in Volume. Note that cups measure volume, not weight, so flour and sugar weigh different amounts per cup.
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