Convert Millimetre to Kilometre
Turn Millimetres into Kilometres in an instant. Type a value below to get an accurate mm → km result, with the formula and a quick-reference table.
1 mm = 0.000001 km
Quick answer: 1 Millimetre = 0.000001 Kilometre
Millimetre to Kilometre conversion table
| Millimetre (mm) | Kilometre (km) |
|---|---|
| 1 mm | 0.000001 km |
| 2 mm | 0.000002 km |
| 5 mm | 0.000005 km |
| 10 mm | 0.00001 km |
| 20 mm | 0.00002 km |
| 50 mm | 0.00005 km |
| 100 mm | 0.0001 km |
| 500 mm | 0.0005 km |
| 1,000 mm | 0.001 km |
How to convert Millimetre to Kilometre
To convert Millimetres to Kilometres, multiply the value by 0.000001.
- Take your measurement in Millimetres.
- Multiply it by 0.000001 — the number of Kilometres in one Millimetre.
- The result is the same amount, expressed in Kilometres.
To go the other way, multiply Kilometres by 1,000,000 — or simply divide by 0.000001.
For example, a sharp pencil tip is about 0.5 mm, which is 5e-7 km.
About Millimetre and Kilometre
A millimetre is one-thousandth of a metre (1/1000 m) — the smallest line printed on a standard ruler. It is the everyday unit for fine measurements such as engineering tolerances, screw threads, paper thickness and rainfall.
A kilometre is 1,000 metres, the standard metric unit for longer distances. It is used for road distances, running races and geography almost everywhere outside the United States and the United Kingdom.
Both the Millimetre and the Kilometre are metric units, so converting between them is just a change of scale: one Millimetre equals 0.000001 Kilometres, and the Kilometre is the larger unit.
Other length conversions
Frequently asked questions
How many Kilometres are in a Millimetre?
1 Millimetre equals 0.000001 Kilometre (mm → km). To convert any amount, multiply the number of Millimetres by 0.000001.
How do I convert Millimetre to Kilometre?
Enter the number of Millimetres in the converter above and read the result in Kilometres. It applies the exact mm → km factor instantly, with full precision.
Is the Millimetre to Kilometre converter free?
Yes — it is completely free and unlimited, needs no sign-up, and runs right in your browser, so it is instant and private.
Is the conversion accurate?
Yes. It uses the internationally defined length factors and full floating-point precision, then rounds the display to a clean, readable number.