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