CM to Inches
This free cm to inches converter turns any centimeter value into inches the moment you type it, using the exact internationally agreed factor: one inch is defined as exactly 2.54 centimeters, so the math is a single division by 2.54 with no rounding hidden inside.
How to use
- Type a value in centimeters into the Value box.
- The equivalent length in inches appears instantly as you type.
- Swap the From and To selects to convert inches back to centimeters.
- Copy the full equation shown under the result into your notes or document.
Frequently asked questions
Is 1 inch exactly 2.54 cm?
Yes — exactly. Since the 1959 international yard and pound agreement, the inch is defined as 2.54 centimeters with no rounding at all. Dividing centimeters by 2.54 therefore gives the mathematically exact inch value, limited only by how many decimals you choose to display.
What is the formula for cm to inches?
inches = centimeters ÷ 2.54. For example, 30 cm ÷ 2.54 = 11.81102362 in, which this tool displays rounded to 10 significant digits. The reverse direction multiplies by 2.54 instead.
How many inches is 1 cm?
One centimeter is 1 ÷ 2.54 = 0.393700787 in, roughly three eighths of an inch. A quick mental shortcut: 10 cm is a little under 4 inches (3.937 in).
Do you store the measurements I convert?
No. The conversion runs entirely in your browser and nothing is uploaded, stored or logged. Close the page and nothing remains.
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About this tool
This free cm to inches converter turns any centimeter value into inches the moment you type it, using the exact internationally agreed factor: one inch is defined as exactly 2.54 centimeters, so the math is a single division by 2.54 with no rounding hidden inside. That definition comes from the 1959 international yard and pound agreement, which means your result matches every engineering standard, not a memorized approximation. The formula is simple — inches = cm ÷ 2.54 — and the page shows the full equation under each result so you can copy it into homework, spec sheets or shopping notes with confidence. Typical uses include clothing and shoe sizes, laptop and TV screen diagonals, carpentry cuts and product dimensions listed on European or Asian sites that need to make sense to an American tape measure. Everything runs locally in your browser: the numbers you type are never uploaded, stored or logged, so you can convert confidential measurements — body sizes, private projects, unreleased products — without a trace. If you need the opposite direction, the unit selects on this page swap to inches to cm in one click.