Inches to Centimeters (in to cm)
Convert inches to centimeters in one step, learn the formula, and use the quick reference table.
Quick answer: To convert inches to centimeters, multiply the inch value by 2.54. For example, 12 inches × 2.54 = 30.48 cm. One inch equals exactly 2.54 centimeters, so centimeter values are always larger numbers than inches.
Inches to centimeters formula
The conversion is based on the international definition of the inch:
centimeters = inches × 2.54
Because an inch is defined as exactly 2.54 centimeters, this factor gives an exact result. There is no rounding needed for the conversion factor itself.
How to convert inches to cm in 3 steps
- Take the length in inches (for example, 24 in).
- Multiply by 2.54 → 24 × 2.54 = 60.96.
- Round as needed → 24 inches = 60.96 cm.
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| Inches (in) | Centimeters (cm) |
|---|---|
| 1 in | 2.54 cm |
| 2 in | 5.08 cm |
| 5 in | 12.70 cm |
| 10 in | 25.40 cm |
| 12 in | 30.48 cm |
| 24 in | 60.96 cm |
| 36 in | 91.44 cm |
| 100 in | 254.00 cm |
Inches vs centimeters
The inch (in) is a unit of length in the imperial and US customary systems, used widely in the United States. The centimeter (cm) is a metric unit of length used worldwide. The conversion is useful for changing TV and monitor sizes, height and craft measurements between systems. Because 1 inch = 2.54 cm exactly, centimeter values are always larger numbers than inches.
Frequently asked questions
How do you convert inches to cm?
Multiply the inch value by 2.54. For example, 12 inches × 2.54 = 30.48 cm.
How many cm is 1 inch?
One inch equals exactly 2.54 centimeters.
How many cm is 12 inches?
12 inches equals 30.48 centimeters (12 × 2.54 = 30.48 cm).