Converters
Centimeters to Inches Converter
Convert centimeters to inches with the exact 2.54 factor. Enter any value for an instant result, then review the formula, examples, and conversion chart.
Centimeters to Inches Converter
Enter a value for an instant, accurate result.
Decimals and zero are supported. Results use four decimal places.
Common values (cm)
Result
3.937in
10 centimeters equals 3.937 inches.
Inches · shown to 4 decimal places, trailing zeros removed
Formula: inches = centimeters ÷ 2.54
Formula
How to convert cm to inches
The relationship is fixed: one inch is exactly 2.54 centimeters. That makes the conversion a single division.
To convert centimeters to inches, divide the centimeter value by 2.54. The result is the length in inches. Because 2.54 is an exact definition rather than a rounded measurement, the same calculation works for a button, a piece of furniture, or a person's height.
For example, 20 centimeters divided by 2.54 equals 7.8740 inches. If you only need a rough estimate, multiplying by 0.4 gives a close answer; the exact result will be slightly smaller. The calculator above always uses the exact factor.
Need the opposite direction? The inches to centimeters converter multiplies by 2.54 instead. You can also use the swap button in the calculator to reverse the direction without leaving this page.
Centimeters → inches
in = cm ÷ 2.54
Divide the centimeter value by 2.54 to get the length in inches.
20 cm ÷ 2.54 = 7.8740 in
Inches → centimeters
cm = in × 2.54
Multiply the inch value by 2.54 to return to centimeters.
12 in × 2.54 = 30.48 cm
The exact factor
2.54
centimeters per inch, exactly. There are no exceptions and no rounding in the underlying conversion.
Examples
Centimeters to inches, worked out
Three examples show how the formula behaves at different scales.
A short measurement
5 cm
5 ÷ 2.54 = 1.9685
= 1.9685 in
A common reference
50 cm
50 ÷ 2.54 = 19.6850
= 19.685 in
An adult height
180 cm
180 ÷ 2.54 = 70.8661
= 70.8661 in
Chart
Common centimeter to inch conversions
These are the values people look up most often. The full chart covers every whole centimeter from 1 to 300.
Displayed inch values are rounded to four decimal places. The calculator above uses the same exact factor with full internal precision.
| Centimeters (cm) | Inches (in) |
|---|---|
| 1 | 0.3937 |
| 5 | 1.9685 |
| 10 | 3.937 |
| 20 | 7.874 |
| 50 | 19.685 |
| 100 | 39.3701 |
| 150 | 59.0551 |
| 170 | 66.9291 |
| 180 | 70.8661 |
| 190 | 74.8031 |
| 200 | 78.7402 |
Reading the result
Decimal inches and rounding
The calculator displays up to four decimal places and removes trailing zeros. A result of 3.937 inches is the same as 3.9370; the shorter form is simply easier to read. When a value is smaller than 0.0001, the display uses a “less than” indicator instead of rounding it to zero.
Decimal inches are convenient for calculators and spreadsheets, but a tape measure is usually marked in fractions. To find the nearest common fraction, convert the decimal part to sixteenths or thirty-seconds and simplify. For everyday work, rounding to the nearest 1/16 inch is usually sufficient. For precision machining or construction, verify against the project's required tolerance.
To convert a height into feet and inches, use the centimeters to feet and inches converter. It converts 180 cm to 5 ft 10.87 in, for example. For a full reference, see the centimeter to inches chart or read the step-by-step conversion guide.
Answers
Frequently asked questions
Quick answers to the questions people ask most about this conversion.
Have another question? Contact CMtoIN.
How do you convert cm to inches?
Divide the centimeter value by 2.54. For example, 20 cm ÷ 2.54 = 7.8740 inches. You can enter any positive value, including zero and decimals, in the calculator above.
What is 1 cm in inches?
One centimeter is 0.3937 inches when rounded to four decimal places. The full value is 0.3937007874 inches, because 1 inch equals 2.54 centimeters.
What is 180 cm in inches?
180 cm is 70.8661 inches. That is the same as 5 feet 10.87 inches when converted to feet and remaining inches.
What is 170 cm in inches?
170 cm is 66.9291 inches. As a height, it is about 5 feet 6.93 inches.
Can I convert inches back to centimeters?
Yes. Use the swap button in the calculator to reverse the direction, or open the inches to centimeters converter. To convert manually, multiply the inch value by 2.54.
Why are results shown to four decimal places?
Four decimal places give a precise result for typical measurements without adding unnecessary digits. The calculator removes trailing zeros, so a whole-number result stays easy to read.
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