CM to Inches Converter

Convert centimeters to inches by dividing by 2.54. Enter any length in cm to get inches, the nearest fraction of an inch, and feet and inches. Example: 30 cm = 11.811 in.

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Centimeters (cm)

Decimal places

How to use the CM to Inches Converter

Type the value in centimeters.
Choose how many decimal places you want.
Press Calculate to see the value in inches, with the formula and steps.

Formula and method

inches = centimeters ÷ 2.54

One inch is defined as exactly 2.54 centimeters, so the conversion is exact. To estimate in your head, multiply the centimeters by 0.4 (this is within 2% of the exact value). For example, 50 cm × 0.4 = 20 in, and the exact answer is 19.685 in.

cm to in conversion chart

Centimeters	Inches	Nearest 1/16 in
1 cm	0.394 in	3/8 in
2 cm	0.787 in	13/16 in
5 cm	1.969 in	1 15/16 in
10 cm	3.937 in	3 15/16 in
15 cm	5.906 in	5 7/8 in
20 cm	7.874 in	7 7/8 in
25 cm	9.843 in	9 13/16 in
30 cm	11.811 in	11 13/16 in
40 cm	15.748 in	15 3/4 in
50 cm	19.685 in	19 11/16 in
60 cm	23.622 in	23 5/8 in
70 cm	27.559 in	27 9/16 in
100 cm	39.37 in	39 3/8 in
150 cm	59.055 in	59 1/16 in
160 cm	62.992 in	63 in
170 cm	66.929 in	66 15/16 in
180 cm	70.866 in	70 7/8 in
190 cm	74.803 in	74 13/16 in
200 cm	78.74 in	78 3/4 in

Height in cm to feet and inches

Heights are often given in centimeters outside the US. Divide by 2.54 for total inches, then by 12 for feet. For 170 cm: 170 / 2.54 = 66.929 in, which is 5 ft 6.93 in (about 5 ft 7 in). For 180 cm: 70.866 in = 5 ft 10.87 in (about 5 ft 11 in).

Common uses

People convert cm to inches for screen and TV sizes, clothing and waist measurements, picture frames, paper sizes (A4 is 21.0 by 29.7 cm, or 8.27 by 11.69 in), baby growth charts and luggage limits. Most airlines list carry-on size in both units, so a 55 x 40 x 20 cm bag is 21.65 x 15.75 x 7.87 in.

What are centimeters and inches?

A centimeter is one hundredth of a meter, the SI unit of length. It is about the width of a fingernail (0.39 in) and is the everyday small unit in most countries.

An inch is one twelfth of a foot. Since the international agreement of 1959 it is defined as exactly 2.54 centimeters.

How to convert centimeters to inches step by step

Write the value you want to convert: 25 cm.
Apply the rule centimeters to inches: ÷ 2.54.
Calculate: 25 ÷ 2.54 = 9.8425 in.
Check a second value, 175 cm: 175 ÷ 2.54 = 68.8976 in.

Round the answer to the precision you need. For quick checks use the mental estimate in the formula section above, and use the converter for exact results.

Full cm to in chart

cm	in	cm	in	cm	in
5 cm	1.9685 in	55 cm	21.6535 in	105 cm	41.3386 in
10 cm	3.937 in	60 cm	23.622 in	110 cm	43.3071 in
15 cm	5.9055 in	65 cm	25.5906 in	115 cm	45.2756 in
20 cm	7.874 in	70 cm	27.5591 in	120 cm	47.2441 in
25 cm	9.8425 in	75 cm	29.5276 in	125 cm	49.2126 in
30 cm	11.811 in	80 cm	31.4961 in	130 cm	51.1811 in
35 cm	13.7795 in	85 cm	33.4646 in	135 cm	53.1496 in
40 cm	15.748 in	90 cm	35.4331 in	140 cm	55.1181 in
45 cm	17.7165 in	95 cm	37.4016 in	145 cm	57.0866 in
50 cm	19.685 in	100 cm	39.3701 in	150 cm	59.0551 in

Frequently asked questions

How many inches are in a centimeter?

One centimeter equals 0.393701 inches, because 1 inch is exactly 2.54 cm.

How do I convert 10 cm to inches?

Divide by 2.54: 10 / 2.54 = 3.937 inches, which is just under 3 15/16 inches.

Is the conversion exact?

Yes. The international inch was defined as exactly 25.4 mm in 1959, so cm to inches is exact apart from rounding.

Sources

NIST: Unit conversion factors

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