CM to Inches Converter

Change centimetres to inches, with the working shown. An inch is exactly 2.54 cm, so divide by 2.54.

cm to in

≈ 11.811 in

30 centimetres is about 11.811 inches.

The same amount in other units

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How to convert cm to inches

Divide the centimetres by 2.54, because 1 inch is exactly 2.54 cm. For 30 cm: 30 ÷ 2.54 ≈ 11.811 inches. As a fraction equal to 1, that is 30 cm × (1 in / 2.54 cm): the cm on the top and bottom cancel and leave inches.

For a quick estimate in your head, multiply by 0.4: 30 cm is about 12 inches. The exact factor is 1 ÷ 2.54 ≈ 0.3937.

CM to inches chart

Centimetres	Inches
1 cm	0.3937 in
2 cm	0.7874 in
2.54 cm	1 in
3 cm	1.1811 in
4 cm	1.5748 in
5 cm	1.9685 in
10 cm	3.937 in
15 cm	5.9055 in
20 cm	7.874 in
25 cm	9.8425 in
25.4 cm	10 in
30 cm	11.811 in
40 cm	15.748 in
50 cm	19.685 in
60 cm	23.622 in
75 cm	29.5276 in
100 cm	39.3701 in
150 cm	59.0551 in
200 cm	78.7402 in

Inches rounded to 4 decimal places where they don’t end.

Height in feet and inches

To write a height in feet and inches, change it to inches, then take out 12 inches for each foot. 175 cm ÷ 2.54 ≈ 68.9 inches, and 68.9 = 5 × 12 + 8.9, so 175 cm is about 5 ft 8.9 in.

Height	Feet and inches
150 cm	4 ft 11.1 in
155 cm	5 ft 1 in
160 cm	5 ft 3 in
165 cm	5 ft 5 in
170 cm	5 ft 6.9 in
175 cm	5 ft 8.9 in
180 cm	5 ft 10.9 in
185 cm	6 ft 0.8 in
190 cm	6 ft 2.8 in
195 cm	6 ft 4.8 in
200 cm	6 ft 6.7 in

Inches rounded to 1 decimal place.

Questions

How many inches is 1 cm?

About 0.3937 inches, since 1 ÷ 2.54 ≈ 0.393701.

How many centimetres are in a foot?

Exactly 30.48 cm, because a foot is 12 inches and 12 × 2.54 = 30.48.

Is an inch exactly 2.54 cm?

Yes. Since 1959 the inch has been defined as exactly 2.54 centimetres, so this factor is not rounded.

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