One inch is defined as exactly 2.54 centimeters, so the conversion is exact rather than approximate. That matters for clothing sizes, screen dimensions, furniture plans and any product listing that quotes dimensions in both units. For the reverse direction with its own reference table, see the Inches to Cm Converter.
Calculator
Formula used
inches = centimeters ÷ 2.54 · centimeters = inches × 2.54
How to use the Cm to Inches Converter
- Type a length in the centimeters box.
- Read the equivalent in the inches box.
- Or type in the inches box to convert back to centimeters.
- Check the reference table for common values.
About this tool
The Cm to Inches Converter is built for speed and accuracy: every calculation runs in your browser, so your data never leaves your device and the result updates as you type. It works equally well on a phone, a tablet or a desktop, and it is free to use as many times as you like.
Common use cases
- Converting body height for a form that uses inches.
- Checking luggage or package dimensions.
- Comparing screen and monitor sizes.
- Following a pattern or plan written in imperial units.
Tips for the best result
- Use the latest figures you have - even a small change in rate or term can shift the outcome by hundreds.
- For annual figures, divide by 12 to get a monthly number you can compare with the result.
- Bookmark this page and revisit the calculation as the inputs change.
Frequently asked questions
How many inches is 1 cm?
Exactly 0.3937 inches. One inch is defined as 2.54 cm, so dividing centimeters by 2.54 gives inches.
Is 2.54 cm exact?
Yes. Since 1959 the international inch has been defined as exactly 25.4 mm, so the factor never introduces rounding error.
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