Convert centimetre to millimetre

1 centimetre = 10 millimetres. Enter any value below for an exact conversion.

Value in centimetres

1 cm =

10 mm

millimetres

Need the reverse? Convert millimetre to centimetre →

Formula

1 centimetre = 10 millimetres
millimetre = centimetres × 10
centimetre = millimetres × 0.1

centimetre to millimetre conversion table

1 cm10 mm

2 cm20 mm

3 cm30 mm

5 cm50 mm

10 cm100 mm

20 cm200 mm

25 cm250 mm

50 cm500 mm

100 cm1000 mm

1000 cm10000 mm

About converting centimetres to millimetres

Centimetres to millimetres is the everyday precision step in engineering drawings, sewing, and 3D printing, where dimensions are specified in millimetres but measured or sketched in centimetres. One centimetre is exactly 10 mm.

Method & sources

Conversions use exact legal definitions rather than rounded approximations: 1 inch = 2.54 cm and 1 pound = 0.45359237 kg (fixed by the 1959 international yard and pound agreement), 1 mile = 1.609344 km, and 1 US liquid gallon = 3.785411784 litres. Temperatures convert with °F = °C × 9⁄5 + 32 and K = °C + 273.15. Results are rounded only for display.

Page last updated: October 1, 2026

Frequently asked questions

How many millimetres are in a centimetre?

One centimetre equals 10 millimetres. So 10 centimetres is 100 millimetres. Use the converter above for any value.

What is the formula to convert centimetres to millimetres?

1 centimetre = 10 millimetres millimetre = centimetres × 10 centimetre = millimetres × 0.1

Is the centimetre-to-millimetre conversion exact?

Yes. The conversion factor between centimetres and millimetres is defined exactly, so results are precise — only rounded for display.

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