Centimetres to Inches Converter

Convert centimetres (cm) to inches (in) instantly. Enter a value in centimetres and this converter returns the equivalent in inches, using the exact factor of 0.393700787. One centimetre is 0.393700787 inches, and one inch is 2.54 centimetres, so you can convert either way. The factor follows the standard definitions of the metre and the international inch, so it is consistent and reliable for school work, trade, engineering, travel and everyday measuring. The formula, a worked example and a quick-reference table are below.

Value in centimetres (cm)

1 cm =0.393700787 in

1 in =2.54 cm

The formula

Multiply centimetres by 0.393700787 to get inches. In symbols, in = cm × 0.393700787. To go the other way, multiply inches by 2.54 to get centimetres.

Worked example

Convert 10 centimetres to inches: 10 × 0.393700787 = 3.93700787 inches.

Quick reference

Centimetres	Inches
1 cm	0.393700787 in
2 cm	0.787401575 in
5 cm	1.96850394 in
10 cm	3.93700787 in
25 cm	9.84251969 in
50 cm	19.6850394 in
100 cm	39.3700787 in

Frequently asked questions

How many inches are in one centimetre?

One centimetre equals 0.393700787 inches. Multiply the number of centimetres by 0.393700787 to convert.

What is the formula to convert centimetres to inches?

Centimetres times 0.393700787 equals inches. To reverse it, multiply inches by 2.54 to get centimetres.

Is the cm to in conversion exact?

The factor comes from the standard definitions of the metre and the international inch (0.0254 m exactly), so the underlying conversion is exact. Displayed results are rounded for readability.

Who this converter is for

This converter is for students, tradespeople, travellers and anyone who needs to change centimetres into inches quickly and accurately.

What this converter assumes

You enter a length in centimetres.
The factor used is 0.393700787 inches per centimetre.
Results are rounded for display.

Sources

Related converters

Length Converter: convert between any length units.
Unit Converter: convert many kinds of units.
Centimetres to Metres Converter: convert centimetres to metres.
Centimetres to Kilometres Converter: convert centimetres to kilometres.

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