Inches to Centimeters Converter
Convert inches to centimeters instantly and back. Uses the exact 2.54 cm per inch factor, with worked examples, a screen-size chart and common in to cm conversions.
Updated 2026-06-14 · Free · No sign-up · Runs privately in your browser
Show the formula & steps
How the Inches to Centimeters Converter Works
This converter switches between inches (in) and centimeters (cm) in both directions, using the exact factor of 2.54 cm per inch. Type a value, pick the direction, and the result updates live with the steps shown.
The Formula
Centimeters = inches × 2.54
Since 1959 the inch has been defined as exactly 2.54 cm, so this conversion is precise rather than approximate. To convert centimeters back to inches, divide by 2.54 (or multiply by about 0.393701).
Worked Example
Convert 12 inches to centimeters:
- 12 × 2.54 = 30.48 cm
Convert 30 centimeters to inches:
- 30 ÷ 2.54 = 11.81 inches
Common Sizes Reference Chart
| Inches | Centimeters |
|---|---|
| 1 | 2.54 |
| 6 | 15.24 |
| 12 (1 ft) | 30.48 |
| 24 | 60.96 |
| 36 (1 yd) | 91.44 |
Where You Will Use It
Inch-to-centimeter conversions show up in screen sizes, clothing measurements, paper and photo dimensions, and DIY projects where US-spec tools meet metric materials. Because the factor is exact, you can convert back and forth as many times as you like without drift.
Frequently asked questions
How many centimeters are in an inch?+
One inch equals exactly 2.54 centimeters by international definition. So 1 cm is about 0.393701 inches.
How do I convert inches to centimeters?+
Multiply the number of inches by 2.54. For example, 12 inches × 2.54 = 30.48 cm. To reverse it, divide centimeters by 2.54.
How many cm is 12 inches?+
12 inches (one foot) equals exactly 30.48 centimeters. Multiply 12 by 2.54 to confirm the figure.
How many cm is a 6 inch ruler?+
A 6 inch ruler is exactly 15.24 cm long. Multiply 6 by 2.54 to get the figure of 15.24 cm.
Is the inch to cm conversion exact?+
Yes. Since 1959, the international inch has been defined as exactly 2.54 cm, so the conversion has no rounding error at all.