Millimeters to kilometers

kilometers = millimeters × 0.000001

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How to convert millimeters to kilometers

One millimeter is 0.000001 kilometers, so multiply the number of millimeters by 0.000001. For example, 20 millimeters is 20 × 0.000001 = 0.00002 kilometers. To go back, divide by the same number, or multiply by 1,000,000.

Quick estimate

Multiplying by about 0.000001 gets within 0.0% of the exact answer, which is enough to check that a result makes sense.

Where it comes up

Length conversions come up in DIY and building plans, running and cycling distances, maps, clothing sizes and travel between countries that use metric and imperial units.

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
25 mm	0.000025 km
30 mm	0.00003 km
40 mm	0.00004 km
50 mm	0.00005 km
60 mm	0.00006 km
70 mm	0.00007 km
75 mm	0.000075 km
80 mm	0.00008 km
90 mm	0.00009 km
100 mm	0.0001 km
120 mm	0.00012 km
150 mm	0.00015 km
200 mm	0.0002 km
250 mm	0.00025 km
300 mm	0.0003 km
400 mm	0.0004 km
500 mm	0.0005 km
750 mm	0.00075 km
1,000 mm	0.001 km
1,500 mm	0.0015 km
2,000 mm	0.002 km
5,000 mm	0.005 km
10,000 mm	0.01 km

Questions

How many kilometers are in a millimeter?

0.000001 kilometers.

How do I convert millimeters to kilometers in a spreadsheet?

Put the value in A1 and type =A1*0.000001, then fill the formula down the column.

Are the values in the table exact?

They are calculated from the exact definitions of the units and rounded only for display. Open any row for the full working.