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Centimetres to millimetres

One centimetre equals ten millimetres.

Centimetres (cm)
10 mm

1 cm = 10 mm.

Formula: Millimetres = Centimetres × 10

*This tool is for informational purposes only. Verify measurements with official records for legal transactions.

Understanding these units

Centimetres

Centimetres are a convenient everyday metric step.

Millimetres

Millimetres add precision for gaps, glass thickness, and tolerances.

Common questions

Multiply your value in centimetres by the conversion factor (see the formula on this page), or use the calculator above.

Yes for everyday engineering: inches are defined as exactly 2.54 cm, and the foot–metre relation follows from that definition.

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