Centimeters to Inches Converter (cm to in) + Formula
One centimeter equals 0.39370079 inches — multiply centimeters by 0.39370079 to convert to inches. To reverse it, multiply inches by 2.54. This factor is exact by definition, since one inch is defined as precisely 2.54 centimeters.
The formula
Multiply your centimeter value by 0.39370079 to get inches.
in = cm × 0.39370079
Example: 30 cm × 0.39370079 = 11.811024 inBecause 1 in = 2.54 cm exactly, dividing centimeters by 2.54 produces the identical result.
Conversion table
| Centimeters (cm) | Inches (in) |
|---|---|
| 1 | 0.3937008 |
| 2 | 0.7874016 |
| 5 | 1.9685039 |
| 10 | 3.9370079 |
| 25 | 9.8425197 |
| 50 | 19.685039 |
| 100 | 39.370079 |
| 200 | 78.740157 |
| 500 | 196.85039 |
| 1000 | 393.70079 |
How to convert online
- Type the number of centimeters into the first box.
- Read the equivalent in inches instantly in the second box.
- Enter an inch value instead to convert back to centimeters.
Use the Centimeter to Inch Converter — free and instant in your browser.
Where this conversion is used
Converting centimeters to inches is a daily need in sewing and tailoring, printing and screen sizes, woodworking, shipping dimensions and online shopping, where product measurements often appear in one system while your tools or expectations use the other.
FAQ
How many inches are in a centimeter?
One centimeter equals 0.39370079 inches. For example, 10 cm is 3.937008 in and 100 cm is 39.370079 in.
What is 20 cm in inches?
20 cm × 0.39370079 = 7.874016 inches, just under 8 inches.
Is the conversion exact?
Yes — the inch is defined as exactly 2.54 cm, so 0.39370079 is that reciprocal rounded to eight decimals and is accurate for any practical purpose.
How do I convert inches back to centimeters?
Multiply inches by 2.54, or use our Inch to Centimeter converter for the reverse direction.
Related converters
- Inch to Centimeter Converter
- Centimeter to Millimeter Converter
- Centimeter to Meter Converter
- Centimeter to Foot Converter
Built by ByteVancer
ByteTools is a free product of ByteVancer, a software and web development studio. Every converter runs entirely in your browser — private and offline-capable. Need a custom tool or web app? ByteVancer builds them to the same standard.
Recommended reading
Yards to Millimeters (yd to mm) Converter
1 yard equals 914.4 millimeters exactly. Multiply yards by 914.4 to convert, with the formula, a reference table and worked examples.
Yards to Miles (yd to mi) Converter
1 yard equals 0.00056818 miles, because there are 1760 yards in a mile. Convert with the formula, a reference table and examples.
Yards to Meters (yd to m) Converter
1 yard equals 0.9144 meters exactly. Multiply yards by 0.9144 to convert, with the formula, a reference table and worked examples.
Yards to Kilometers (yd to km) Converter
1 yard equals 0.0009144 kilometers. Multiply yards by 0.0009144 to convert, with the formula, a reference table and worked examples.