How to convert centimeters to inches
1 in = 2.54 cm (exact, since 1959)
inches = centimeters ÷ 2.54
1 cm ≈ 0.393701 in
Shortcut: Multiply centimeters by 0.4 for a quick estimate (it runs about 1.6% high): 30 cm ≈ 12 in; the exact answer is 11.811 in.
Cm to inches table
| Centimeters | Inches |
|---|---|
| 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 |
| 6 cm | 2.3622 in |
| 7 cm | 2.7559 in |
| 8 cm | 3.1496 in |
| 9 cm | 3.5433 in |
| 10 cm | 3.937 in |
| 15 cm | 5.9055 in |
| 20 cm | 7.874 in |
| 25 cm | 9.8425 in |
| 30 cm | 11.811 in |
| 40 cm | 15.748 in |
| 50 cm | 19.685 in |
| 60 cm | 23.622 in |
| 70 cm | 27.5591 in |
| 80 cm | 31.4961 in |
| 90 cm | 35.4331 in |
| 100 cm | 39.3701 in |
| 150 cm | 59.0551 in |
| 200 cm | 78.7402 in |
Values are calculated with exact factors and rounded for the table; the converter above shows full precision.
Worked examples
10 cm to inches
10 ÷ 2.54
3.937 in
30 cm to inches
30 ÷ 2.54
11.811 in
100 cm to inches
100 ÷ 2.54
39.3701 in
Questions
How many inches is 1 cm?
About 0.3937 inches. Exactly, 1 cm = 1 ÷ 2.54 in.
How many cm are in an inch?
Exactly 2.54 centimeters, by international agreement since 1959.
How do I convert cm to inches without a calculator?
Divide by 2.5 for a close estimate (about 1.6% high), or multiply by 4 and divide by 10. For exact results divide by 2.54.
Related conversions
- Inches to centimeters (the reverse)
- Meters to feet
- Feet to meters
- Kilometers to miles
- Miles to kilometers
- Millimeters to inches
- Length & distance converter: every length & distance unit, with the full drawing
The history: Where the inch, foot, yard and mile came from.