Convert inch to centimetre

1 inch = 2.54 centimetres. Enter any value below for an exact conversion.

Value in inches

1 in =

2.54 cm

centimetres

Need the reverse? Convert centimetre to inch →

Formula

1 inch = 2.54 centimetres
centimetre = inches × 2.54
inch = centimetres × 0.3937008

inch to centimetre conversion table

1 in2.54 cm

2 in5.08 cm

3 in7.62 cm

5 in12.7 cm

10 in25.4 cm

20 in50.8 cm

25 in63.5 cm

50 in127 cm

100 in254 cm

1000 in2540 cm

About converting inches to centimetres

Converting inches to centimetres comes up constantly when buying US-spec products in metric countries — TVs and monitors quoted in inches, tyre and wheel sizes, picture frames, and DIY measurements. One inch is defined as exactly 2.54 cm, so the conversion is precise rather than approximate.

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 centimetres are in a inch?

One inch equals 2.54 centimetres. So 10 inches is 25.4 centimetres. Use the converter above for any value.

What is the formula to convert inches to centimetres?

1 inch = 2.54 centimetres centimetre = inches × 2.54 inch = centimetres × 0.3937008

Is the inch-to-centimetre conversion exact?

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

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