Inches to Centimeters
Turn any inch measurement into precise centimeters—the exact reverse of the imperial-to-metric formula.
in
2.54 cm
Formula
centimeters = inches × 2.54. This multiplier is fixed by international treaty, so the result is exact rather than an approximation.
Quick reference
| Inches | Centimeters |
|---|---|
| 1 | 2.54 |
| 3 | 7.62 |
| 6 | 15.24 |
| 12 | 30.48 |
| 24 | 60.96 |
| 36 | 91.44 |
| 60 | 152.4 |
The inch is defined as exactly 25.4 millimeters and is still the everyday unit for screens, tools, and lumber in the United States, the United Kingdom, and Canada, even though both countries formally adopted the metric system decades ago.
The centimeter, one hundredth of a meter, is the practical unit most countries use for body measurements, packaging, and product dimensions. Converting inches to centimeters is the step that lets a specification written in one system be read accurately in the other.
Common uses
- Translating a suitcase, monitor, or picture frame dimension listed in inches on a U.S. product page into centimeters before ordering from a store that ships internationally.
- Checking whether a piece of imported furniture or hardware, specified in whole or fractional inches, will actually fit an opening measured at home in centimeters.
Frequently asked questions
- How many cm is 12 inches?
- 12 inches equals exactly 30.48 cm (12 × 2.54). This is also the length of a standard U.S. ruler.
- Why do U.S. screen sizes stay in inches instead of switching to cm?
- The consumer electronics industry standardized on diagonal inches decades ago, and changing the labeling convention now would break comparisons with older products and existing marketing.
- Is the conversion the same for fractional inches like 5 1/2?
- Yes. Convert the fraction to a decimal first (5.5), then multiply by 2.54; the formula does not change for fractional or whole-number inputs.