Unit Converter
Convert between metric and imperial units across length, weight, temperature, volume, area, speed, time and digital storage.
To
1 cm = 0.393701 in(1 cm = 0.393701 in)
1 cm in every length unit
- Millimetres (mm)10
- Metres (m)0.01
- Kilometres (km)0.00001
- Inches (in)0.393701
- Feet (ft)0.032808
- Yards (yd)0.010936
- Miles (mi)0.000006
- Nautical miles (nmi)0.000005
Common conversions
1 inch is exactly 2.54 centimetres, 1 pound is 0.45359237 kilograms, and 1 mile is 1.609344 kilometres — those three are defined values, not approximations, so the results here are exact rather than rounded estimates.
US and UK gallons are not the same
A US gallon is about 3.79 litres; an imperial (UK) gallon is about 4.55 litres — roughly 20% larger. Both are listed separately above, which matters for fuel economy figures in particular.
Kilobytes: 1000 or 1024?
Storage here uses 1024 bytes to the kilobyte, which is how operating systems report file sizes. Drive manufacturers use 1000, which is why a “1 TB” disk shows up as roughly 931 GB.