Convert km to mm
Kilometers to millimeters. Enter a value to convert, or use the km to mm chart further down the page.
1 kilometer equals 1,000,000 millimeters. Going the other way, 1 millimeter = 0.000001 kilometers.
How to convert km to mm
To convert kilometers to millimeters, multiply the kilometer value by 1000000. You can also divide by 0.000001 to get the same answer.
mm = km × 1000000
Worked example
Convert 15 km to millimeters:
15 km = 15,000,000 mm
km to mm conversion chart
Use this km to mm table for quick reference without typing anything.
| kilometers (km) | millimeters (mm) |
|---|---|
| 0.01 km | 10,000 mm |
| 0.1 km | 100,000 mm |
| 1 km | 1,000,000 mm |
| 2 km | 2,000,000 mm |
| 3 km | 3,000,000 mm |
| 5 km | 5,000,000 mm |
| 10 km | 10,000,000 mm |
| 20 km | 20,000,000 mm |
| 50 km | 50,000,000 mm |
| 100 km | 100,000,000 mm |
| 1,000 km | 1,000,000,000 mm |
What is a kilometer?
The kilometer is one thousand meters and is the standard unit for road distances and long-range measurement almost everywhere outside the United States and the United Kingdom.
What is a millimeter?
The millimeter is a metric unit equal to one thousandth of a meter. It is the smallest unit marked on a standard metric ruler and is the working unit of engineering drawings, machining tolerances and rainfall measurement.
Frequently asked questions
How many mm are in a kilometer?
1 km equals 1,000,000 mm. Going the other way, 1 mm is 0.000001 km.
How do you convert km to mm?
To convert kilometers to millimeters, multiply the kilometer value by 1000000. You can also divide by 0.000001 to get the same answer.
What is 10 km in mm?
10 km equals 10,000,000 mm. The conversion chart on this page lists the other values people look up most often.
Related length conversions
Convert km to other units
- mm to km
- km to cm
- km to meters
- km to inches
- km to feet
- km to yards
- km to miles
- km to micrometers
- km to nanometers
Convert other units to mm
Popular conversions
cm to inchesinches to cmkg to lbslbs to kgCelsius to FahrenheitFahrenheit to Celsiusmm to inchesinches to mmkm to milesmiles to kmmeters to feetfeet to meterscm to feetfeet to inchesinches to feetml to fl ozfl oz to mlliters to gallonsgallons to literscups to ml