Centimeters to Inches
Type centimeters (cm), see inches (in).
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How to convert centimeters to inches
To change centimeters into inches, multiply by 0.393700787402.
inches = centimeters × 0.393700787402
Going the other way: centimeters = inches × 2.54
1 centimeter = 0.39370079 inches. This factor does not end, so results on this page are rounded.
Worked example
You have 30 centimeters. Multiply by 0.393700787402. 30 × 0.393700787402 = 11.811 in.
Centimeters to inches conversion table
| Centimeters (cm) | Inches (in) |
|---|---|
| 1 cm | 0.3937 in |
| 2 cm | 0.7874 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 |
| 30 cm | 11.811 in |
| 50 cm | 19.685 in |
| 75 cm | 29.5276 in |
| 100 cm | 39.3701 in |
| 150 cm | 59.0551 in |
| 175 cm | 68.8976 in |
| 180 cm | 70.8661 in |
The inch is defined from the centimeter, not the other way round
1 inch is exactly 2.54 cm. That is a definition, agreed internationally in 1959, not a measurement — which is why converting inches to centimeters is exact and converting centimeters to inches is not. Going this direction you divide by 2.54, and the answer is a decimal that never quite ends.
Heights are the usual reason people land here, and they are spoken in feet and inches rather than inches alone. 180 cm is about 70.9 inches, which people say as 5 ft 11 in. The table below gives the decimal; divide by 12 for the feet and keep the remainder for the inches.
Screen sizes are measured diagonally, corner to corner, never across the width. A 15-inch laptop screen is about 38 cm diagonally, and its width is considerably less.
Some trades still use fractional inches — sixteenths, eighths, quarters. 2.54 cm is one inch, 1.27 cm is a half, and 0.3175 cm is an eighth.
Frequently asked questions
How many inches is 30 cm?
30 cm is about 11.81 inches — just under a standard 12-inch ruler.
How many inches is 100 cm?
100 cm, one meter, is about 39.37 inches.
What is 180 cm in feet and inches?
180 cm is about 70.87 inches, which is 5 ft 11 in.
How many cm is 1 inch?
1 inch is exactly 2.54 cm, by international definition.
How many inches is 15 cm?
15 cm is about 5.91 inches.
Why is this conversion not exact both ways?
Because the inch is defined as exactly 2.54 cm. Multiplying inches by 2.54 is exact; dividing centimeters by 2.54 gives a decimal that repeats, so this direction is always rounded.
Related converters
- Inches to Centimeters in → cm
- Feet to Centimeters ft → cm
- Meters to Feet m → ft
- All length converters How long or tall something is — feet, centimeters and meters.
Every factor on this page is listed in our conversion methodology.