Centimeters to millimeters

1 centimeter = 10 millimeters

Type a value in centimeters (cm) to get millimeters (mm) straight away. A centimeter is larger than a millimeter, so the number goes up. Both units belong to length, measured here against the meter.

FromTo10

1 cm = 10 mm

Formula

mm = cm × 10

One centimeter is 10 millimeters, so multiply the centimeter value by that factor. Here cm is the value in centimeters and mm is the result in millimeters.

Worked example: 170 centimeters × 10 = 1,700 millimeters.

Centimeters to millimeters table

centimeters (cm)	millimeters (mm)
1 cm	10 mm
2 cm	20 mm
3 cm	30 mm
4 cm	40 mm
5 cm	50 mm
6 cm	60 mm
7 cm	70 mm
8 cm	80 mm
9 cm	90 mm
10 cm	100 mm
15 cm	150 mm
20 cm	200 mm
25 cm	250 mm
30 cm	300 mm
40 cm	400 mm
50 cm	500 mm
60 cm	600 mm
75 cm	750 mm
100 cm	1,000 mm

Everyday centimeters in millimeters

What it is	cm	mm
a postage stamp (about)	2.5 cm	25 mm
a school ruler	30 cm	300 mm
a standard interior door width	90 cm	900 mm
5 ft in height	152 cm	1,520 mm
a tall adult	180 cm	1,800 mm

Quick estimate in your head

Multiply by 10^1: move the decimal point 1 place right (add 1 zero).

About the units

Centimeter (cm). One hundredth of a meter. The usual metric unit for height, clothing and small objects.

Millimeter (mm). One thousandth of a meter. Used for engineering drawings, rainfall and screen sizes in some countries.

Going the other way, 1 millimeter is 0.1 centimeters.

Questions

How many millimeters are in 1 centimeter?

1 centimeter is 10 millimeters, and 1 millimeter is 0.1 centimeters.

How do I convert centimeters to millimeters?

Use mm = cm × 10. For example, 170 centimeters × 10 = 1,700 millimeters.

Is the centimeter to millimeter factor exact?

The factor comes from the unit definitions. Results here are rounded to 6 significant digits for display.

How much is a tall adult in millimeters?

180 cm is 1,800 mm.

Source for the conversion factor: NIST SP 811, Appendix B (conversion factors).

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