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Inches to CM converter
Enter a number, fraction, power, π, or arithmetic expression.1 in = 2.54 cm centimeters = inches × 2.54
Ready for local conversionInches to CM formula
centimeters = inches × 2.54
1 inch = exactly 2.54 centimeters
Because 2.54 is an exact defined factor, any rounding comes from the input measurement or the displayed result—not from the conversion itself.
How to convert Inches to Centimeters
Multiply inches by 2.54. You can calculate fractional inputs such as 8 1/2 directly in the converter, which is useful for dimensions originally written with common inch fractions.
Example calculation
A 12-inch measurement converts to 30.48 cm: 12 × 2.54 = 30.48.
12 in = 30.48 cm
When this conversion is useful
Use inches to centimeters when adapting US hardware dimensions, checking luggage or display sizes, or entering measurements into a metric-only form.
Common Inches to Centimeters conversions
| Inches (in) | Centimeters (cm) |
|---|---|
| 1 | 2.54 |
| 4 | 10.16 |
| 8.5 | 21.59 |
| 12 | 30.48 |
| 24 | 60.96 |
| 36 | 91.44 |
Inches to CM FAQ
There are exactly 2.54 centimeters in one international inch.
Turn the fraction into a decimal or enter it as an expression. For example, 6 1/2 inches is 6.5 × 2.54 = 16.51 centimeters.
Yes for a physical diagonal length. A 15.6-inch screen diagonal is 39.624 centimeters, although the screen's width and height depend on its aspect ratio.