Inches to CM
This free inches to cm converter multiplies any inch value by exactly 2.54 the moment you type it — no tables, no rounding guesswork.
How to use
- Type a value in inches into the Value box.
- The equivalent length in centimeters appears instantly as you type.
- Swap the From and To selects to convert centimeters back to inches.
- Copy the full equation shown under the result into your notes or document.
Frequently asked questions
Is 1 inch exactly 2.54 cm when converting?
Yes. The international inch is defined as exactly 2.54 centimeters, so inches × 2.54 is the exact conversion with no hidden rounding. 10 in × 2.54 = 25.4 cm is precise, not approximate.
What is the formula for inches to centimeters?
cm = inches × 2.54. For example, 27 in × 2.54 = 68.58 cm. The reverse direction divides by 2.54 instead. Both directions use the same single exact factor.
Why is the inch defined in centimeters?
In 1959 the United States and countries of the Commonwealth agreed on international yard and pound definitions to end small differences between national standards. Fixing the yard at 0.9144 meters makes the inch exactly 2.54 cm, so one conversion factor serves trade, engineering and science everywhere.
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 inches to cm converter multiplies any inch value by exactly 2.54 the moment you type it — no tables, no rounding guesswork. The inch has been internationally defined as exactly 2.54 centimeters since the 1959 yard and pound agreement, so multiplying by 2.54 is not an approximation but the legal definition itself, and your result agrees with engineering drawings, medical charts and product specs worldwide. The formula fits on one line — cm = inches × 2.54 — and the complete equation is printed under every result, ready to paste into homework, pattern drafts or dimension sheets. It is the everyday direction for US-sourced information: a 27-inch monitor becomes 68.58 cm, a 5-foot-9 person listed in inches becomes a clean centimeter figure for forms, and furniture sized in inches suddenly fits (or does not fit) through a door frame measured in centimeters. Like every tool on this site, the conversion runs entirely in your browser: nothing you type is uploaded, stored or logged, so measurements from private projects or personal documents stay on your device. To go the other way, the From and To selects on this page swap to cm to inches in one click.