Convert centimeters to inches instantly. Enter a value below, or use the formula and reference table further down the page.
In practice
Centimeter-to-inch conversions come up constantly in clothing sizes, furniture dimensions, and product listings — most manufacturers outside the US quote sizes in centimeters, while American shoppers think in inches. The ratio itself isn't an approximation: 1 inch was fixed at exactly 2.54cm by international agreement in 1959, so this conversion is exact, not rounded. One thing worth double-checking when you're shopping internationally: a listing's centimeter figure might describe exterior dimensions on one site and interior (usable) space on another — the unit conversion is reliable, but what's actually being measured isn't always stated clearly.
How to convert centimeters to inches
Multiply the value by 0.3937007874.
in = cm × 0.3937007874Example: 10 cm = 3.937 in.
Centimeters to Inches conversion table
| Centimeters (cm) | Inches (in) |
|---|---|
| 1 cm | 0.3937 in |
| 2 cm | 0.7874 in |
| 3 cm | 1.1811 in |
| 4 cm | 1.5748 in |
| 5 cm | 1.9685 in |
| 10 cm | 3.937 in |
| 15 cm | 5.9055 in |
| 20 cm | 7.874 in |
| 25 cm | 9.8425 in |
| 50 cm | 19.685 in |
| 100 cm | 39.3701 in |
Frequently asked questions
How many inches is 1 centimeter?
1 centimeter equals 0.3937 inches.
What is the formula to convert cm to in?
To convert cm to in, multiply the value by 0.3937007874. The full formula is: in = cm × 0.3937007874.
How do I convert inches back to centimeters?
Use the same calculator above and type your value into the inches field instead — it converts in both directions. Or use the reverse formula: cm = in ÷ 0.3937007874.
Is the cm to in conversion exact?
The conversion factor used here (0.3937007874) is the standard internationally defined value. Results on this page are rounded to four decimal places for readability.