How do you convert centimeters to millimeters?

To convert centimeters to millimeters, multiply by 10. For example, 40 cm is 400 mm.

How many millimeters are in a centimeter?

There are 10 millimeters in one centimeter.

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Converters · Length

40 Centimeters to Millimeters

40 cm =

400 mm

40 centimeters equals 400 millimeters

How to convert centimeters to millimeters

To get millimeters, multiply by 10.

mm = cm × 10

Worked example: 40 × 10 = 400 mm.

Going the other way, multiply by 0.1 — one millimeter is 0.1 centimeters.

Values near 40 cm

Centimeter	Millimeter
20 cm	200 mm
38 cm	380 mm
39 cm	390 mm
41 cm	410 mm
42 cm	420 mm
80 cm	800 mm

Centimeter to Millimeter — common values

Centimeter	Millimeter
1 cm	10 mm
2 cm	20 mm
3 cm	30 mm
5 cm	50 mm
10 cm	100 mm
25 cm	250 mm
50 cm	500 mm
100 cm	1000 mm

Convert Centimeter to other units

cm → m cm → km cm → mm cm → mi cm → yd cm → ft cm → in cm → nmi

← Reverse: Millimeter to Centimeter

Questions

How do you convert centimeters to millimeters?: To convert centimeters to millimeters, multiply by 10. For example, 40 cm is 400 mm.
How many millimeters are in a centimeter?: There are 10 millimeters in one centimeter.
How do you convert millimeters back to centimeters?: Go the other way: multiply by 0.1. One millimeter is 0.1 centimeters.

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