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Centimetres to Inches Converter

Enter centimetres, get inches instantly — plus the same length in millimetres, metres, feet and yards.

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How to use CM to Inches Converter — Exact cm to in

  1. 1Pick the kind of measurement, then the unit you are converting from and to.
  2. 2Type your value — the result updates as you type.
  3. 3Scroll down for the same value in every other unit, and a table of common conversions.

About CM to Inches

Centimetres and inches are the two everyday units that refuse to line up, which is why this conversion comes up constantly — screen sizes, luggage limits, furniture dimensions, fabric, and any product spec written for one market and read in another. The relationship itself is simple and exact: 2.54 cm to the inch, fixed by international agreement in 1959 and unchanged since.

What usually goes wrong is rounding too early. Using 0.39 instead of 0.3937007874 is off by about a millimetre every ten centimetres, so a two-metre measurement drifts by nearly two centimetres — enough to matter for a shelf, a frame or a print. This converter keeps the exact factor throughout and only rounds the number it shows you.

The reference table under the result exists because a single number is rarely the whole answer. A length in centimetres is often wanted in millimetres for a drawing and in feet for a room, so all of them are listed side by side, and the 1 / 2 / 5 / 10 / 50 / 100 table gives you the anchors most people end up memorising anyway.

Frequently asked questions

How do I convert cm to inches by hand?
Divide by 2.54. For example 30 cm ÷ 2.54 = 11.811024 inches, just under a foot. Going the other way, multiply inches by 2.54.
How many inches is 100 cm?
39.370079 inches — that is one metre, or 3 feet 3.37 inches. 50 cm is 19.685039 inches and 10 cm is 3.937008 inches.
Is 1 inch exactly 2.54 cm, or is that a rounding?
It is exact. The 1959 international yard and pound agreement defined the inch as precisely 2.54 cm, so every cm-to-inch conversion is an exact division rather than an approximation.
Why does the result show so many decimal places?
Because 1 cm in inches is a repeating decimal, 0.3937007874…. Rounding it to two places loses about 0.09 mm for every centimetre, which adds up to nearly a whole centimetre over a metre — fine for a rough measurement, not for cutting material.
Does it give fractional inches like 5 3/8?
No — results are decimal inches only. If you need sixteenths for woodworking or sewing, take the decimal part and multiply by 16: 0.375 in × 16 = 6, so 6/16, which is 3/8.
Is it free, and does it work offline?
Yes to both. There is no sign-up and no limit, and because the whole converter is JavaScript running on your device you can load the page, go offline, and it still works.