Convert kilometers (km) to millimeters (mm) with formulas, examples, and conversion tables.
How to Convert kilometers to millimeters
To convert kilometers to millimeters, multiply the value by 1000000.
The Formula
millimeters = kilometers × 1000000
Key Fact
1 kilometer = 1000000 millimeters
Tip: To convert millimeters back to kilometers, divide by 1000000.
About Kilometers and Millimeters
What is a Kilometer?
The kilometer (km) is a unit of length in the metric system. One kilometer equals 1000 meters.
What is a Millimeter?
The millimeter (mm) is a unit of length in the metric system. One millimeter equals 0.001 meters.