Kilometres to millimetres converter
Millimetres (mm)
1 kilometre = 1,000,000 millimetres
How to convert kilometres to millimetres
mm = km × 1000000
Multiply the number of kilometres by 1000000 to get millimetres. Going the other way, divide by 1000000 (or multiply by 0.000001).
One kilometre is exactly defined as 1000000 millimetres (to 12 significant figures), and one millimetre is 0.000001 kilometres.
Worked examples
- Convert 5 kilometres: 5 × 1000000 = 5,000,000 5,000,000 millimetres.
- Convert 12.5 kilometres: 12.5 × 1000000 = 12,500,000 12,500,000 millimetres.
- Convert 250 kilometres: 250 × 1000000 = 250,000,000 250,000,000 millimetres.
Quick-reference table
| km | mm |
|---|---|
| 1 | 1,000,000 |
| 2 | 2,000,000 |
| 3 | 3,000,000 |
| 5 | 5,000,000 |
| 10 | 10,000,000 |
| 15 | 15,000,000 |
| 20 | 20,000,000 |
| 25 | 25,000,000 |
| 50 | 50,000,000 |
| 75 | 75,000,000 |
| 100 | 100,000,000 |
| 1,000 | 1,000,000,000 |
| mm | km |
|---|---|
| 1 | 0.000001 |
| 2 | 0.000002 |
| 3 | 0.000003 |
| 5 | 0.000005 |
| 10 | 0.00001 |
| 15 | 0.000015 |
| 20 | 0.00002 |
| 25 | 0.000025 |
| 50 | 0.00005 |
| 75 | 0.000075 |
| 100 | 0.0001 |
| 1,000 | 0.001 |
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Frequently asked questions
How many millimetres are in 1 kilometre?
1 kilometre equals 1,000,000 millimetres.
What is the formula to convert kilometres to millimetres?
Use mm = km × 1000000. Multiply the number of kilometres by 1000000 to get millimetres. Going the other way, divide by 1000000 (or multiply by 0.000001).
What is 100 kilometres in millimetres?
100 kilometres is 100,000,000 millimetres.