Convert Millimeter to Kilometer
Use this free converter to change millimeters (mm) into kilometers (km). Millimeter and kilometer both measure length. As a quick reference, 1 mm equals 0.000001 km, and 1 km equals 1000000 mm.
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Kilometer (km)
0.000001
1 mm = 0.000001 km
Length conversion table
| Millimeter | Kilometer |
|---|---|
| 0.01 | 1.0000e-8 |
| 0.1 | 1.0000e-7 |
| 0.5 | 5.0000e-7 |
| 1 | 0.000001 |
| 2 | 0.000002 |
| 3 | 0.000003 |
| 5 | 0.000005 |
| 10 | 0.00001 |
| 20 | 0.00002 |
| 25 | 0.000025 |
| 50 | 0.00005 |
| 100 | 0.0001 |
| 1,000 | 0.001 |
How to convert Millimeter to Kilometer
Multiply the millimeter value by 0.000001 to get kilometers.
- Enter the number of millimeters you want to convert.
- The converter instantly shows the equivalent value in kilometers.
- Worked example: 15 mm × 0.000001 = 0.000015 km.
- Use the swap button to reverse the conversion (kilometer to millimeter).
About these units
Millimeter (mm)
- Definition
- A millimeter (mm) is one thousandth of a meter, used where small, precise measurements are needed.
- History
- Like other metric subdivisions it was defined in the 1790s using the prefix "milli-" (one thousandth).
- Current use
- Engineers, machinists, and manufacturers specify tolerances in millimeters, and rainfall is commonly reported in mm.
Kilometer (km)
- Definition
- A kilometer (km) is 1,000 meters and is the metric unit used for measuring longer distances such as roads and travel.
- History
- It entered use with the metric system in the 1790s, combining the SI prefix "kilo-" (thousand) with the meter.
- Current use
- Most of the world expresses road distances and speed limits in kilometers; the main exceptions are the United States and the United Kingdom, which still use miles.
Frequently asked questions
How many kilometers are in a millimeter?
There are 0.000001 km in 1 mm. To convert, multiply the number of millimeters by 0.000001.
How do I convert millimeters to kilometers?
Multiply the millimeter value by 0.000001 to get kilometers. For example, 10 mm = 0.00001 km.
Is this millimeter-to-kilometer converter free?
Yes. This converter is completely free, runs entirely in your browser, and requires no sign-up. Your inputs never leave your device.
Convert Millimeter to other length units
| Unit | 1 Millimeter equals |
|---|---|
| Meter (m) | 0.001 m |
| Kilometer (km) | 0.000001 km |
| Centimeter (cm) | 0.1 cm |
| Micrometer (µm) | 1000 µm |
| Nanometer (nm) | 1000000 nm |
| Mile (mi) | 6.2137e-7 mi |
| Yard (yd) | 0.0010936133 yd |
| Foot (ft) | 0.0032808399 ft |
| Inch (in) | 0.039370079 in |
| Nautical Mile (nmi) | 5.3996e-7 nmi |
| Light Year (ly) | 1.0570e-19 ly |