The inch is an imperial unit of length used in the United States and the UK.
Inches to Centimeters
Convert inches (in) to centimeters (cm) instantly. Free online length converter with formulas, tables and examples.
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Length Converter
Convert metric, imperial, and nautical distance units.
Context values
Some unit families need one extra value for a physically accurate result.
The centimeter is one hundredth of a meter.
cm = in × 2.54
Results update instantly for Inches to Centimeters conversions.
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Formula
cm = in × 2.54
in = cm ÷ 2.54
Conversion table
| 1 in | 2.540000 cm |
| 10 in | 25.400000 cm |
| 100 in | 254.000000 cm |
| 1000 in | 2540.000000 cm |
Related conversions
Step-by-step example
- Start with the value you want to convert: 12 in.
- Apply the formula: cm = 12 × 2.54.
- Work out the calculation: 12 × 2.54 = 30.48.
- Result: 12 in is equal to 30.48 cm.
Inch vs Centimeter
| Attribute | Inch | Centimeter |
|---|---|---|
| Symbol | in | cm |
| Category | Length | Length |
| System | US customary / Imperial | Metric / SI |
| Typically used for | The inch is an imperial unit of length used in the United States and the UK. | The centimeter is one hundredth of a meter. |
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Frequently asked questions
How do you convert inch to centimeter?
Use the formula cm = in × 2.54. One inch equals 2.54 centimeters.
What is Inch?
The inch is an imperial unit of length used in the United States and the UK.
What is Centimeter?
The centimeter is one hundredth of a meter.
Is the inch to centimeter conversion exact?
Yes. Inch and Centimeter are both defined against internationally agreed constants, so the conversion factor used here is exact -- any rounding you see comes only from the number of decimal places displayed, not from the relationship itself.
How do I convert centimeter back to inch?
Use the reverse formula in = cm ÷ 2.54. This site's reverse converter does the same calculation automatically.
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About this conversion
This length converter turns inch into centimeter using the exact defined relationship between the two units, not an approximation. A 12-inch ruler is about 30.48 cm long. The inch has roots in Roman and Anglo-Saxon measurement; it was standardized internationally in 1959 as exactly 2.54 centimeters. The centimeter is a metric subdivision of the meter introduced with the metric system in the 1790s. Because both units are built on internationally standardized constants, the same inch-to-centimeter factor works whether you're doing a quick everyday estimate or a calculation that needs to be precise.