About millimetres and kilometres
A millimetre (mm) is one thousandth of a metre. It is used for small measurements in engineering, manufacturing and rainfall.
A kilometre (km) is 1,000 metres. It is the standard unit for road distances and map distances in most countries.
How the conversion works
Converts millimetres to kilometres, and back again. Type a value in either box and the other one updates as you type. The conversion uses 1 millimetre = 0.000001 kilometres.
Millimetre to Kilometre conversion table
| millimetres | kilometres |
|---|---|
| 1 millimetre | 0.000001 kilometres |
| 2 millimetres | 0.000002 kilometres |
| 5 millimetres | 0.000005 kilometres |
| 10 millimetres | 0.00001 kilometres |
| 25 millimetres | 0.000025 kilometres |
| 50 millimetres | 0.00005 kilometres |
| 100 millimetres | 0.0001 kilometres |
| 1,000 millimetres | 0.001 kilometres |
How to use it
- Enter a value in millimetres to see it in kilometres, or type in the other box to convert the opposite way.
- Check the quick conversion table below for common values.
- To convert by hand, multiply the number of millimetres by 0.000001.
Did you know?
- A standard bank card is 0.76 millimetres thick.
- The Earth's circumference around the equator is about 40,075 kilometres.