Convert Millimeters to Kilometers

Enter the length in millimeters below to get the value converted to kilometers.

Results in Kilometers:
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1 mm = 1.0E-6 km

How to Convert Millimeters to Kilometers

Tape measures can be used to measure units of length, and a calculator can be used to convert to another unit

Convert millimeters to kilometers with this simple formula:

kilometers = millimeters × 1.0E-6

Converting a millimeter length measurement to a kilometer measurement involves multiplying the length by the conversion ratio to find the result. One millimeter is equal to 1.0E-6 kilometers, so to convert simply multiply by 1.0E-6.

For example, here's how to convert 5 millimeters to kilometers using the formula above.
5 mm = (5 × 1.0E-6) = 5.0E-6 km

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. Learn more about length and find more length measurement conversion calculators. Millimeters are a metric measurement and can be abbreviated as mm, for example 1 mm. Kilometers are a metric measurement and can be abbreviated as km, for example 1 km. Learn more about the metric system, including the common unit prefixes and how to convert between metric units.

Millimeter is spelled millimetre internationally, and it is equal in length to .1 centimeters, 1000 micrometers, or 5/127 inch. They are represented by the smallest ticks on most metric rulers. To get a reference point of the size, the thickness of a dime is 1.35mm.

To get an idea of how small a millimeter is, a dime is 1.35mm thick.

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.

millimeters and kilometers are units used to measure length
Convert Kilometers to Millimeters

Millimeter Measurements and Equivalent Kilometer Conversions

Common millimeter values converted to the equivalent kilometer value
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

US Customary & Imperial Units
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
SI Units
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