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inch (in) → centimeter (cm)

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Use our free online converter to convert between units instantly. Enter any value in the field above to get accurate results. No signup or download required—all conversions run in your browser. Our calculator uses standard conversion factors for reliability.

0
in=cm
0.01=0.0254
0.1=0.254
1=2.54
2=5.08
3=7.62
5=12.7
10=25.4
20=50.8
50=127
100=254
1000=2,540

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Brief explanation: inch to centimeter

Length conversion multiplies by a factor. Meter is the base unit in the metric system. Kilometer = 1000 m, mile ≈ 1609 m. Foot = 0.3048 m, inch = 2.54 cm. The metric system (km, m, cm, mm) is used worldwide. The imperial system (mi, ft, in, yd) is common in the United States and United Kingdom. When converting, multiply the value by the appropriate factor—for example, to convert km to miles, multiply by 0.621371.

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Common conversion examples: inch to centimeter

Reference values for quick comparison. Use the converter above for any amount.

  • 1 inch=2.54 centimeter
  • 5 inch=12.70 centimeter
  • 100 inch=254 centimeter

About the Units

inch (in)

Definition: An inch (in) is a unit of length equal to 1/12 of a foot or exactly 2.54 centimeters. It is a fundamental unit in the imperial and US customary systems for small measurements.
History: The inch has been used in England since at least the 7th century. It was historically defined by barleycorns (3 barleycorns = 1 inch). The current definition of 2.54 cm was adopted internationally in 1959.
Current use: Inches are used for screen sizes, tire dimensions, and small measurements in the US and UK. TV and monitor diagonals are often given in inches. Craft and woodworking use inches for precision.

centimeter (cm)

Definition: A centimeter (cm) is a unit of length equal to one hundredth of a meter. There are 100 centimeters in one meter. The prefix centi- means one hundredth. It is commonly used for measurements that fall between millimeters and meters.
History: The centimeter emerged with the metric system in late 18th-century France. It provided a convenient scale for human-scale measurements—body height, object dimensions—without the decimals required when using meters alone. It remains part of the SI system.
Current use: Centimeters are used for human height, clothing sizes, and small object dimensions. They appear on rulers and measuring tapes. In countries using the metric system, body measurements and craft dimensions are typically given in centimeters.

Sources

Centimeters and inches are used for small lengths. Use this for screen sizes, clothing, or precision measurements. 1 cm ≈ 0.394 in.

Conversion factors and unit definitions follow international standards. For authoritative references, see: