Calculate inches from centimeters instantly, with decimal inches, the nearest fractional inch, and a feet and inches breakdown.
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Centimeters to Inches Formula
One inch is defined as exactly 2.54 centimeters, so the calculator converts between the two units with a single constant.
To convert centimeters to inches, divide the centimeter value by 2.54:
inches = cm / 2.54
To convert inches to centimeters, multiply the inch value by 2.54:
cm = inches * 2.54
- cm: the length in centimeters
- inches: the length in inches
- 2.54: the number of centimeters in one inch (an exact, defined value)
The direction selector decides which formula runs. In the centimeters to inches mode the calculator divides by 2.54 and also reports the result as a decimal, as the nearest fraction of an inch, as feet and inches, and in millimeters. In the inches to centimeters mode it multiplies by 2.54 and reports centimeters, millimeters, meters, and feet and inches. The advanced options let you set how many decimal places to show and which fraction of an inch to round to, from a half down to a thirty-second, which matches the marks on a standard tape measure.
Common Centimeter to Inch Conversions
These values cover the conversions you are most likely to need. Inches are rounded to two decimal places.
| Centimeters | Inches (decimal) | Nearest 1/16 inch |
|---|---|---|
| 1 cm | 0.39 in | 3/8 in |
| 2.54 cm | 1.00 in | 1 in |
| 5 cm | 1.97 in | 1 15/16 in |
| 10 cm | 3.94 in | 3 15/16 in |
| 30.48 cm | 12.00 in | 12 in |
| 100 cm | 39.37 in | 39 3/8 in |
The reverse table shows whole inches converted to centimeters, which is handy when you start from an inch measurement.
| Inches | Centimeters |
|---|---|
| 1 in | 2.54 cm |
| 6 in | 15.24 cm |
| 12 in | 30.48 cm |
| 36 in | 91.44 cm |
Example Problems
Example 1: Convert 30.48 cm to inches. Divide the centimeter value by 2.54: 30.48 / 2.54 = 12. So 30.48 cm equals 12 inches, which is also 1 foot 0 inches.
Example 2: Convert 5 cm to inches. Divide by 2.54: 5 / 2.54 = 1.9685 inches. Rounded to the nearest sixteenth of an inch that is 1 and 15/16 inches, which is the mark you would read on a tape measure.
Frequently Asked Questions
How many centimeters are in one inch? There are exactly 2.54 centimeters in one inch. This is a defined value rather than a rounded measurement, so any centimeter to inch conversion is exact when you keep enough decimal places.
How do I convert centimeters to inches without the calculator? Divide the number of centimeters by 2.54. For a quick mental estimate you can multiply the centimeters by 0.4, since one centimeter is about 0.3937 inches, but dividing by 2.54 gives the precise answer.
Why does the calculator show a fraction of an inch? Tape measures and rulers in the United States are marked in fractions such as halves, quarters, eighths, and sixteenths rather than decimals. The calculator rounds the decimal inch result to the nearest fraction you choose so you can match the reading on a physical measuring tool.
