Unit converter

Convert length, weight, temperature, area, volume and speed in one place. Type a value and see the result in your chosen unit, plus every other unit in the same group.

Value

From

Kilometre—

All units

Millimetre (mm): —
Centimetre (cm): —
Metre (m): —
Kilometre (km): —
Inch (in): —
Foot (ft): —
Yard (yd): —
Nautical mile (nmi): —

Results are rounded to 8 significant digits.

How to use

Choose a group such as length or temperature, type a value and pick the units to convert from and to. The result updates as you type.

Quick answer: the large number shows the result in the "To" unit. Use the swap button to turn the conversion around.
Every unit at once: below the result you see the same value in all other units of the group, so you don't need to convert twice.
Decimals: type decimals with a point or a comma, both work.

Frequently asked questions

How many kilometres is a mile?

One mile is exactly 1.609344 km, and one kilometre is about 0.621 miles. A quick estimate: multiply miles by 1.6 to get kilometres.

How do you convert Celsius to Fahrenheit?

Multiply by 9, divide by 5 and add 32. So 20 °C is 20 × 9 ÷ 5 + 32 = 68 °F. To go back, subtract 32 and multiply by 5/9.

How big is a hectare or an acre?

A hectare is 10,000 m², roughly the size of a football pitch and a half. An acre is about 4,047 m², so one hectare is almost 2.5 acres.

Why are US and UK gallons different?

They come from different historical measures. A US gallon is about 3.785 litres and a UK (imperial) gallon about 4.546 litres. Check which one your source uses.