CM to Inches Formula
Exact conversion factor
Inches = Centimeters ÷ 2.54 Example: 10 cm ÷ 2.54 = 3.94 in This factor is exact rather than an approximation—derived directly from the 1959 International Yard and Pound agreement defining 1 inch as precisely 2.54 cm. Because of this unified definition, there is no variance between US Customary and Imperial values.
Common reference points
| Centimeters | Inches |
|---|---|
| 1 cm | 0.39 in |
| 5 cm | 1.97 in |
| 10 cm | 3.94 in |
| 15 cm | 5.91 in |
| 20 cm | 7.87 in |
| 30 cm | 11.81 in |
| 50 cm | 19.68 in |
| 100 cm | 39.37 in |
Frequently asked questions
How many inches is 1 cm?
1 cm equals approximately 0.3937 inches. Divide any centimeter value by 2.54 to convert it into inches.
How many centimeters is an inch?
There are exactly 2.54 centimeters in 1 inch by international definition.
How many inches is 10 cm?
10 cm equals approximately 3.94 inches.