CM to Inches Converter

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Convert centimetres to inches exactly (1 inch = 2.54 cm). Type on either side to convert back.

From

1 cm = 0.3937007874 in

1 cm in every length unit
Unit	Value
Millimetre mm	10
Centimetre cm	1
Metre m	0.01
Kilometre km	0.00001
Inch in	0.3937007874
Foot ft	0.03280839895
Yard yd	0.01093613298
Mile mi	0.000006213711922
Nautical mile nmi	0.000005399568035
Micrometre µm	10,000

How to use, limits & privacy

About CM to Inches Converter

Convert centimetres to inches with the exact definition: 1 inch is 2.54 cm, so inches = cm ÷ 2.54. For example 10 cm = 3.937 in, 30 cm = 11.811 in, 100 cm = 39.37 in and 170 cm = 66.929 in. The page opens with Centimetre in From and Inch in To. Type in either box and the other updates as you type, and a table below shows the same length in millimetres, metres, feet, yards and more.

How to Use

Type the centimetres

Enter the value in the From box, for example 15 or 172.5. Commas and spaces in long numbers are ignored.

Read the inches

The To box and the line below it show the result, such as "15 cm = 5.905511811 in". Round it to the precision you need.

Need feet too?

Look at the Foot row in the table, or change the To unit to Foot. For a height in feet and inches, see the FAQ below.

Copy or convert back

Click Copy result for the number without commas. Type in the To box, or press Swap units, to go from inches to cm.

Privacy & Processing

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Max Input Size: Device memory limits
Account Required: No
Data Stored Locally: Nothing you type is saved. If you switch to another category, that choice is remembered in this browser.
Network Processing: Assets or models may require an initial download

Everything is calculated in your browser. Nothing you type is sent anywhere.

Rules & Limitations

The conversion uses exact fractions and shows up to 10 significant digits, so 1 cm appears as 0.3937007874 in. Whole-number results are shown in full.
The tool converts one unit at a time; there is no combined feet-and-inches box. Split the inches yourself: 12 inches make a foot.
Type only a number. Letters, fractions such as 1/2 and symbols such as " are not accepted.

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CM to Inches Converter FAQ

How many inches is 1 cm?

1 cm is 0.3937 inches (exactly 1 ÷ 2.54 = 0.393700787…). Going the other way, 1 inch is exactly 2.54 cm, which is the number to remember.

What is 170 cm in feet and inches?

170 cm is 66.929 inches. Take away 60 inches for 5 feet and 6.93 inches are left, so 170 cm is about 5 ft 7 in. Likewise 160 cm is about 5 ft 3 in, 165 cm about 5 ft 5 in and 180 cm about 5 ft 11 in.

How do I convert cm to inches without a calculator?

Divide by 2.54, or for a quick estimate multiply by 0.4: 30 cm × 0.4 is about 12 in (the exact answer is 11.81 in). For anything that must fit, use the exact figure from the tool.

How many cm are in a foot?

Exactly 30.48 cm, since a foot is 12 inches of 2.54 cm. So 1 metre (100 cm) is 39.37 inches, or 3 ft 3.37 in.

Why does the result show so many decimals?

Most cm values do not divide evenly by 2.54, so the inch value never ends. The tool shows up to 10 significant digits so you can round it yourself; Copy result copies that full number.