1 millimeter (mm) = 0.000001 kilometers (km). To convert, divide by 1,000,000: km = mm ÷ 1,000,000. For example, 500,000 mm = 0.5 km.
km = mm ÷ 1,000,000
Millimeters to kilometers table
| Millimeters (mm) | Kilometers (km) |
|---|---|
| 100,000 | 0.1 |
| 200,000 | 0.2 |
| 300,000 | 0.3 |
| 400,000 | 0.4 |
| 500,000 | 0.5 |
| 1,000,000 | 1 |
| 2,000,000 | 2 |
| 2,500,000 | 2.5 |
| 5,000,000 | 5 |
| 10,000,000 | 10 |
| 25,000,000 | 25 |
| 50,000,000 | 50 |
| 100,000,000 | 100 |
The two units
Millimeter (mm). One thousandth of a meter.
Kilometer (km). One thousand meters.
Because both units are defined in terms of the same base unit, the factor 0.000001 is exact, not a rounded measurement.
Convert millimeters to other units
- Millimeters to meters — 1 mm = 0.001 m
- Millimeters to centimeters — 1 mm = 0.1 cm
- Millimeters to micrometers — 1 mm = 1,000 µm
- Millimeters to nanometers — 1 mm = 1,000,000 nm
- Millimeters to miles — 1 mm = 6.213712e-7 mi
- Millimeters to yards — 1 mm = 0.0010936133 yd
- Millimeters to feet — 1 mm = 0.0032808399 ft
- Millimeters to inches — 1 mm = 0.0393700787 in
- Millimeters to nautical miles — 1 mm = 5.399568e-7 nmi
Convert other units to kilometers
Questions people ask
- How many kilometers are in a millimeter?
- 0.000001, exactly.
- How do you convert millimeters to kilometers?
- km = mm ÷ 1,000,000. It is the same as dividing by 1,000,000.
- How do you convert kilometers back to millimeters?
- mm = km × 1,000,000. See kilometers to millimeters.
Results use the legal definitions of each unit and are checked against the Pint unit library. Display rounds to 10 significant digits. All unit conversions · More tools
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