Centimeters to Inches (cm to in)
Convert centimeters to inches in one step, learn the formula, and grab a quick reference table.
Quick answer: To convert centimeters to inches, divide the centimeter value by 2.54 (or multiply by 0.393701). For example, 30 cm ÷ 2.54 = 11.81 inches. One centimeter equals about 0.39 inches.
Centimeters to inches formula
The conversion is based on the international definition of the inch:
inches = centimeters ÷ 2.54 = centimeters × 0.393701
Because an inch is defined as exactly 2.54 centimeters, this factor gives an exact result. For everyday use you can round it to 0.3937 with no meaningful loss of accuracy.
How to convert cm to inches in 3 steps
- Take the length in centimeters (for example, 50 cm).
- Divide by 2.54 → 50 ÷ 2.54 = 19.685.
- Round as needed → 50 cm ≈ 19.69 inches.
Convert any value instantly. Skip the math and use the live tool.
Open the converterWorked examples
| Centimeters (cm) | Inches (in) |
|---|---|
| 1 cm | 0.3937 in |
| 5 cm | 1.9685 in |
| 10 cm | 3.9370 in |
| 15 cm | 5.9055 in |
| 20 cm | 7.8740 in |
| 30 cm | 11.8110 in |
| 50 cm | 19.6850 in |
| 100 cm | 39.3701 in |
Centimeters vs inches
The centimeter (cm) is a metric unit of length used worldwide for everyday measurements. The inch (in) is a unit of length in the imperial and US customary systems, common for screen sizes, paper and clothing. Because 1 inch = 2.54 cm exactly, centimeter values are always larger numbers than the equivalent inches.
Frequently asked questions
How do you convert cm to inches?
Divide the centimeter value by 2.54 (or multiply by 0.393701). For example, 30 cm ÷ 2.54 = 11.81 inches.
How many inches is 1 cm?
One centimeter equals about 0.3937 inches.
How many inches is 30 cm?
30 centimeters equals about 11.81 inches (30 ÷ 2.54 = 11.8110 in).