Seldons
cm to inches
1 centimeter = 0.393701 inches.
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How do you convert centimeters to inches?
Use this formula. It is exact — these units are defined by international agreement, not measured.
in = cm ÷ 2.54
Example: 10 cm × 0.393700787 = 3.93701 in.
cm to inches conversion table
Common values, rounded to six significant figures.
| cm | in |
|---|---|
| 1 cm | 0.393701 in |
| 2 cm | 0.787402 in |
| 5 cm | 1.9685 in |
| 10 cm | 3.93701 in |
| 15 cm | 5.90551 in |
| 20 cm | 7.87402 in |
| 25 cm | 9.84252 in |
| 30 cm | 11.811 in |
| 40 cm | 15.748 in |
| 50 cm | 19.685 in |
| 60 cm | 23.622 in |
| 80 cm | 31.4961 in |
| 100 cm | 39.3701 in |
| 120 cm | 47.2441 in |
| 150 cm | 59.0551 in |
| 170 cm | 66.9291 in |
| 180 cm | 70.8661 in |
Centimeters are the everyday metric length for clothing sizes, luggage dimensions and body measurements; inches are what US retail listings use. Airline cabin bag limits are a common collision — 55 × 40 × 20 cm is 21.7 × 15.7 × 7.9 in, which is why the US equivalents are usually quoted as 22 × 16 × 8.
Values worth remembering
These come up often enough that knowing them saves a lookup.
- 170 cm = 66.9291 inaverage adult height
- 30 cm = 11.811 ina school ruler
- 2.54 cm = 1 inexactly one inch
Questions people ask
How many inches is 1 centimeter?
1 centimeter is 0.393701 inches.
How many centimeters is 1 inch?
1 inch is 2.54 centimeters.
How do you convert centimeters to inches in your head?
Use × 0.4. That lands within a percent or so of the exact figure, which is close enough for packing, shipping estimates and shopping — use the calculator when the number has to be right.
Is the centimeter to inch conversion exact?
Yes. The relationship is exact by international agreement, so 0.393700787 is a definition rather than a measurement. Rounding in the answer comes from display, not from the conversion.