CM to Inches Converter
Convert centimetres to inches and inches to centimetres, with the nearest fraction of an inch.
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How to do it
- 1Fill in the boxes
Type your numbers or pick the options you need.
- 2See the result
The answer updates right away as you change a value.
- 3Use it
Copy the result or note it down. Nothing is sent anywhere.
About this tool
Enter a length and choose the direction. One inch is exactly 2.54 centimetres. The tool also shows the nearest sixteenth of an inch, useful for measuring and woodworking.
The formula
Inches = centimetres ÷ 2.54. Centimetres = inches × 2.54.
Examples
10 cm is 3.94 in, 30 cm is 11.81 in, 50 cm is 19.69 in and 100 cm is 39.37 in. A standard A4 sheet is 21 by 29.7 cm, or 8.27 by 11.69 in.
Fractions
Tape measures use fractions of an inch down to sixteenths. The tool rounds to the nearest sixteenth to help you read them.
Frequently asked questions
How many inches in a cm?
0.3937 inches.
How do I convert quickly?
Divide centimetres by 2.5 for a close estimate in inches.
What is the A4 size in inches?
8.27 by 11.69 inches.
Is the inch exactly 2.54 cm?
Yes, since 1959 by international agreement.