Convert Millimeters to Kilometers
Enter the length in millimeters below to get the value converted to kilometers.
How to Convert Millimeters to Kilometers
To convert a millimeter measurement to a kilometer measurement, multiply the length by the conversion ratio. One millimeter is equal to 1.0E-6 kilometers, so use this simple formula to convert:
The length in kilometers is equal to the millimeters multiplied by 1.0E-6.
Our inch fraction calculator can add millimeters and kilometers together and it also automatically converts the results to US customary, imperial and SI metric values.
Millimeters and kilometers are both units used to measure length. Keep reading to learn more about each unit of measure.
Millimeters
One millimeter is equal to one-thousandth (1/1,000) of a meter, which is defined as the distance light travels in a vacuum in a 1/299,792,458 second time interval.
The millimeter, or millimetre, is a multiple of the meter, which is the SI base unit for length. In the metric system, "milli" is the prefix for 10-3. Millimeters can be abbreviated as mm, for example 1 millimeter can be written as 1 mm.
Millimeters are often represented by the smallest ticks on most metric rulers. To get a reference point of the size, the thickness of a US dime is 1.35mm.
Kilometers
One kilometer is equal to 1,000 meters, which are defined as the distance light travels in a vacuum in a 1/299,792,458 second time interval.
The kilometer, or kilometre, is a multiple of the meter, which is the SI base unit for length. In the metric system, "kilo" is the prefix for 103. Kilometers can be abbreviated as km, for example 1 kilometer can be written as 1 km.
We recommend using a ruler or tape measure for measuring length, which can be found at a local retailer or home center. Rulers are available in imperial, metric, or combination with both values, so make sure you get the correct type for your needs.
If you need a ruler you can also download and print our free printable rulers, which include both imperial and metric measurements.
Millimeter Measurements and Equivalent Kilometer Conversions
| Millimeters | Kilometers |
|---|---|
| 1 mm | 0.000001 km |
| 2 mm | 0.000002 km |
| 3 mm | 0.000003 km |
| 4 mm | 0.000004 km |
| 5 mm | 0.000005 km |
| 6 mm | 0.000006 km |
| 7 mm | 0.000007 km |
| 8 mm | 0.000008 km |
| 9 mm | 0.000009 km |
| 10 mm | 0.00001 km |
| 11 mm | 0.000011 km |
| 12 mm | 0.000012 km |
| 13 mm | 0.000013 km |
| 14 mm | 0.000014 km |
| 15 mm | 0.000015 km |
| 16 mm | 0.000016 km |
| 17 mm | 0.000017 km |
| 18 mm | 0.000018 km |
| 19 mm | 0.000019 km |
| 20 mm | 0.00002 km |
| 21 mm | 0.000021 km |
| 22 mm | 0.000022 km |
| 23 mm | 0.000023 km |
| 24 mm | 0.000024 km |
| 25 mm | 0.000025 km |
| 26 mm | 0.000026 km |
| 27 mm | 0.000027 km |
| 28 mm | 0.000028 km |
| 29 mm | 0.000029 km |
| 30 mm | 0.00003 km |
| 31 mm | 0.000031 km |
| 32 mm | 0.000032 km |
| 33 mm | 0.000033 km |
| 34 mm | 0.000034 km |
| 35 mm | 0.000035 km |
| 36 mm | 0.000036 km |
| 37 mm | 0.000037 km |
| 38 mm | 0.000038 km |
| 39 mm | 0.000039 km |
| 40 mm | 0.00004 km |
More Millimeter Length Conversions
- Convert to Miles
- 1 mm is equal to 6.2137E-7 miles
- Convert to Yards
- 1 mm is equal to 0.001094 yards
- Convert to Feet
- 1 mm is equal to 0.003281 feet
- Convert to Inches
- 1 mm is equal to 0.03937 inches
- Convert to Meters
- 1 mm is equal to 0.001 meters
- Convert to Centimeters
- 1 mm is equal to 0.1 centimeters
- Convert to Micrometers
- 1 mm is equal to 1,000 micrometers
- Convert to Nanometers
- 1 mm is equal to 1,000,000 nanometers
