Convert Kilometer to Millimeter
Use this free converter to change kilometers (km) into millimeters (mm). Kilometer and millimeter both measure length. As a quick reference, 1 km equals 1000000 mm, and 1 mm equals 0.000001 km.
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Millimeter (mm)
1000000
1 km = 1000000 mm
Length conversion table
| Kilometer | Millimeter |
|---|---|
| 0.01 | 10000 |
| 0.1 | 100000 |
| 0.5 | 500000 |
| 1 | 1000000 |
| 2 | 2000000 |
| 3 | 3000000 |
| 5 | 5000000 |
| 10 | 10000000 |
| 20 | 20000000 |
| 25 | 25000000 |
| 50 | 50000000 |
| 100 | 100000000 |
| 1,000 | 1000000000 |
How to convert Kilometer to Millimeter
Multiply the kilometer value by 1000000 to get millimeters.
- Enter the number of kilometers you want to convert.
- The converter instantly shows the equivalent value in millimeters.
- Worked example: 15 km × 1000000 = 15000000 mm.
- Use the swap button to reverse the conversion (millimeter to kilometer).
About these units
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.
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.
Frequently asked questions
How many millimeters are in a kilometer?
There are 1000000 mm in 1 km. To convert, multiply the number of kilometers by 1000000.
How do I convert kilometers to millimeters?
Multiply the kilometer value by 1000000 to get millimeters. For example, 10 km = 10000000 mm.
Is this kilometer-to-millimeter 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 Kilometer to other length units
| Unit | 1 Kilometer equals |
|---|---|
| Meter (m) | 1000 m |
| Centimeter (cm) | 100000 cm |
| Millimeter (mm) | 1000000 mm |
| Micrometer (µm) | 1000000000 µm |
| Nanometer (nm) | 1000000000000 nm |
| Mile (mi) | 0.62137119 mi |
| Yard (yd) | 1093.6133 yd |
| Foot (ft) | 3280.8399 ft |
| Inch (in) | 39370.079 in |
| Nautical Mile (nmi) | 0.5399568 nmi |
| Light Year (ly) | 1.0570e-13 ly |