Inches to CM Converter
Convert inches (in) to centimeters (cm) instantly. Type a value — the result updates as you type, and the swap button converts the other way.
More cm and inch tools
Inches to cm formula
cm = in × 2.54
1 inch = 2.54 centimeters · 1 centimeter = 0.3937 inches
To convert inches to centimeters, multiply the value by 2.54. For example, 12 in:
cm = 12 × 2.54cm = 30.48
So 12 in = 30.48 cm.
Mental math shortcut
Quick mental estimate: multiply by 2.5. For 12 in that gives about 30 cm — off by 0.48 cm (1.6%). Use the exact formula when precision matters.
Inches to cm conversion table
cm back to Inches
The same values converted the other way, rounded for everyday use:
| Centimeters | Inches |
|---|---|
| 1.27 cm | 0.5 in |
| 2.54 cm | 1 in |
| 5.08 cm | 2 in |
| 7.62 cm | 3 in |
| 10.16 cm | 4 in |
| 12.7 cm | 5 in |
| 15.24 cm | 6 in |
| 20.32 cm | 8 in |
About the units
Inches (in)
An inch is defined as exactly 2.54 centimeters. There are 12 inches in a foot; inches are used in the US for screens, heights and small lengths.
Centimeters (cm)
A centimeter is one hundredth of a meter. It is the everyday metric unit for body height, clothing and short lengths.
Frequently asked questions
How many centimeters are in a inch?
One inch equals 2.54 centimeters.
What is 12 Inches in cm?
12 in = 30.48 cm.
How do I convert cm back to Inches?
Divide the centimeters by 2.54. Or use the CM to Inches converter.