Centimeters to Inches Converter
Enter a length in centimeters to see it in inches right away, using the exact definition that one inch equals 2.54 cm. Edit either box and the other updates live, so it works both ways. A reference table lists common lengths, and the math runs entirely in your browser.
How to convert centimeters to inches
- Type the length in centimeters into the left box labeled Centimeters (cm).
- Read the value in inches in the right box labeled Inches (in) as it updates live.
- To go the other way, type into the inches box and the centimeters box updates instead.
- Check the '1 cm = 0.393701 in' line under the boxes to confirm the conversion factor.
- Use the reference table (1, 2, 5, 10, 25, 50, 100 cm) for quick lookups without typing.
Examples
The exact definition
2.54 cm
1 in
Ten centimeters
10 cm
3.937008 in
Convert a height
170 cm
66.929134 in (about 5 ft 7 in)
Frequently asked questions
What is the formula to convert centimeters to inches?
Divide the centimeter value by 2.54, because one inch is defined as exactly 2.54 cm. So inches = cm / 2.54. For example, 10 cm becomes 10 / 2.54, which the tool shows as 3.937008 inches.
What are some common centimeter to inch conversions?
2.54 cm is 1 inch, 5 cm is about 1.968504 inches, 10 cm is 3.937008 inches, 30.48 cm is exactly 12 inches (one foot), 50 cm is 19.685039 inches, and 100 cm is 39.370079 inches.
Is this conversion exact?
The factor is exact: one inch is exactly 2.54 cm by international agreement since 1959. So 2.54 cm is exactly 1 inch and 30.48 cm is exactly 12 inches. Displayed results are rounded to six decimal places, but the underlying calculation is precise.
How do I convert my height from centimeters to inches?
Divide your height in cm by 2.54 to get total inches, then divide by 12 for feet and keep the remainder as inches. For example, 170 cm is 66.929134 inches, which is about 5 feet 6.9 inches, usually rounded to 5 feet 7 inches.
How many inches are in a centimeter?
One centimeter equals about 0.393701 inches, the number shown under the input boxes. Put another way, there are exactly 2.54 centimeters in every inch, so a centimeter is a little under four tenths of an inch.
Why do I sometimes see a long decimal in the inches box?
Most centimeter values do not land on a whole number of inches, because 2.54 does not divide evenly. The tool rounds to six decimals for display, so 3 cm reads 1.181102 inches. Round it yourself to the precision your task needs.
How do I convert inches back to centimeters?
Multiply the inch value by 2.54, or just type into the inches box on the right and read the centimeters box on the left. For example, 5 inches is 5 times 2.54, which is 12.7 cm.
What is the difference between a centimeter and a millimeter here?
A centimeter is ten millimeters, so 1 cm is 10 mm. If your measurement is in millimeters, divide by 10 to get centimeters first, then convert. For instance, 25 mm is 2.5 cm, which is about 0.984252 inches.
Is my data sent anywhere?
No. The conversion runs entirely in your browser, so the values you enter never leave your device. There is no server call and nothing is logged.
Learn more
- Why one inch equals exactly 2.54 cm
The story behind the 2.54 cm inch, how the 1959 international yard fixed it, and how to convert cm to inches by hand with confidence.
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