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CM to Inches converter
Enter a number, fraction, power, π, or arithmetic expression.1 cm = 0.393700787402 in inches = centimeters ÷ 2.54
Ready for local conversionCM to Inches formula
inches = centimeters ÷ 2.54
1 centimeter = 0.3937007874015748 inches
The relationship comes from the exact international definition that 1 inch equals 2.54 centimeters.
How to convert Centimeters to Inches
Divide the number of centimeters by 2.54. For a quick estimate, multiplying centimeters by 0.394 gives a close inch value; use the converter when the extra precision matters.
Example calculation
A shelf that is 30.48 cm deep is exactly 12 inches deep: 30.48 ÷ 2.54 = 12.
30.48 cm = 12 in
When this conversion is useful
This direction is useful when metric product dimensions need to fit inch-based specifications, such as frames, cabinets, monitors, or sewing patterns.
Common Centimeters to Inches conversions
| Centimeters (cm) | Inches (in) |
|---|---|
| 1 | 0.393700787402 |
| 2.54 | 1 |
| 10 | 3.93700787402 |
| 30.48 | 12 |
| 100 | 39.3700787402 |
| 200 | 78.7401574803 |
CM to Inches FAQ
One centimeter is approximately 0.3937007874 inches. The decimal repeats because the exact definition runs in the other direction: one inch is exactly 2.54 centimeters.
Yes. Since 1959, the international inch has been defined as exactly 25.4 millimeters, which is exactly 2.54 centimeters.
Two decimal places suit many everyday dimensions. Keep more digits for manufacturing tolerances, technical drawings, or calculations that continue through later steps.