Convert 20 mm to km

How to convert millimeters to kilometers

1. Formula: kilometers = millimeters × 0.000001
2. Put in the value: 20 millimeters.
3. Result: 0.00002 kilometers.

Millimeters to kilometers table

Converting the other way: kilometers to millimeters

millimeters = kilometers × 1,000,000. So 0.00002 kilometers is back to 20 millimeters; one kilometer is 1,000,000 millimeters. See the kilometers to millimeters table.

Quick estimate in your head

For a rough answer, multiply by about 0.000001: 20 × 0.000001 ≈ 0.00002 km, against the exact 0.00002 km (0.0% out). Good enough to check that a calculated result is sensible.

Common mistakes

The usual slip is using the factor the wrong way round. A millimeter is smaller than a kilometer, so the number of kilometers must come out smaller than the number of millimeters. If your answer goes the other way, divide instead of multiplying.

About the units

Millimeter (mm) and kilometer (km) are both units of length. One millimeter equals 0.000001 kilometers, and one kilometer equals 1,000,000 millimeters. Results on this page are rounded for display; the conversion itself uses the exact definitions.

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.

20 millimeters in other units

The most readable unit for this amount is centimeters (2).

• 2 cm
• 0.02 m
• 0.00002 km
• 0.78740157 in
• 0.0656168 ft
• 0.02187227 yd
• 0.00001243 mi
• 0.0000108 nmi
• 0.01093613 fm
• 20,000 um

How this answer was calculated

The result is worked out from the numbers in this page's address when the page is opened, using exact arithmetic wherever possible and rounding only for display. Nothing is copied from a printed table. If you think an answer is wrong, please tell us through the contact page and we will check it.

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