Last updated: September 2026
Length conversion
Centimeters to Inches (cm to in)
Use this page for international product sizes, furniture dimensions, and body measurements that need an inch equivalent.
1 cm
0.393700787402 in
in = cm ÷ 2.54
The formula
How to convert centimeters to inches
Apply in = cm ÷ 2.54. For example, 1 cm equals 0.393700787402 in.
Precision
Accurate constants, readable results
OmniUnit calculates with the full stored conversion factor, then displays up to 12 significant digits.
Common centimeters conversions
| Centimeters | Inches |
|---|---|
| 1 cm | 0.393700787402 in |
| 5 cm | 1.96850393701 in |
| 10 cm | 3.93700787402 in |
| 20 cm | 7.87401574803 in |
| 50 cm | 19.6850393701 in |
| 100 cm | 39.3700787402 in |
Related length conversions
Frequently asked questions
How many inches are in 1 centimeter?
One centimeter equals 0.393700787402 inches. The inch is defined as exactly 2.54 centimeters, so one centimeter is 1 ÷ 2.54 inches, which is 0.393700787402.
How many centimeters are in 1 inch?
One inch equals exactly 2.54 centimeters, by international definition. To convert inches back to centimeters, use the inches-to-centimeters page, which shows the exact formula and a quick calculator.
How do I convert centimeters to inches without a calculator?
Multiply the centimeters by 0.39 for a quick estimate — for example, 50 cm is about 19.5 inches. For precise results, use the calculator above or divide the centimeters by 2.54.
Is the centimeter-to-inch conversion exact?
Yes. The inch is defined as exactly 2.54 centimeters, so 1 cm = 0.393700787402 in is a fixed definition, not a measurement. OmniUnit calculates with the full stored factor for maximum precision.