cm ↔ Inches Converter
Convert centimeters to inches, or inches to centimeters — type any value in either direction. Click any result to copy it.
cm to Inches Conversion Table
| Centimeters | Inches (decimal) | Inches (fraction) |
|---|---|---|
| 1 cm | 0.3937" | 25/64" |
| 2 cm | 0.7874" | 25/32" |
| 3 cm | 1.1811" | 1 3/16" |
| 4 cm | 1.5748" | 1 37/64" |
| 5 cm | 1.9685" | 1 31/32" |
| 6 cm | 2.3622" | 2 23/64" |
| 7 cm | 2.7559" | 2 3/4" |
| 8 cm | 3.1496" | 3 5/32" |
| 9 cm | 3.5433" | 3 35/64" |
| 10 cm | 3.9370" | 3 15/16" |
| 12 cm | 4.7244" | 4 23/32" |
| 15 cm | 5.9055" | 5 29/32" |
| 20 cm | 7.8740" | 7 7/8" |
| 21 cm | 8.2677" | 8 17/64" |
| 25 cm | 9.8425" | 9 27/32" |
| 30 cm | 11.8110" | 11 13/16" |
| 50 cm | 19.6850" | 19 11/16" |
| 100 cm | 39.3701" | 39 3/8" |
Frequently Asked Questions
How many inches is 1 cm?
1 centimeter equals 0.3937 inches. This is because 1 inch is defined as exactly 2.54 cm, so 1 ÷ 2.54 = 0.3937.
How do you convert cm to inches?
Divide the centimeter value by 2.54. Formula: inches = cm ÷ 2.54. For example, 10 cm ÷ 2.54 = 3.937 inches. To go the other way, multiply inches by 2.54 to get centimeters.
How many cm is 5 inches?
5 inches = 12.7 cm. Multiply by 2.54: 5 × 2.54 = 12.70 cm.
How many inches is 20 cm?
20 cm = 7.874 inches. Divide by 2.54: 20 ÷ 2.54 = 7.874 inches.
How many inches is 30 cm?
30 cm = 11.811 inches, which is just under 1 foot. A standard ruler is 30 cm (12 inches).
Is 2.54 cm exactly 1 inch?
Yes. Since 1959, 1 inch is defined as exactly 2.54 centimeters by international agreement. This is not an approximation — it is the exact legal definition.
How many cm is 1 foot?
1 foot = 30.48 cm. Since 1 foot = 12 inches and 1 inch = 2.54 cm: 12 × 2.54 = 30.48 cm.