One inch equals 2.54 centimeters, to convert 21 inches to cm we have to multiply the amount of inches by 2.54 to obtain the width, height or length in centimeters. 21 inches are equal to 21 x 2.54 = 53.34 centimeters.
An inch (symbol: in) is a unit of length. It is defined as 1⁄12 of a foot, also is 1⁄36 of a yard. Though traditional standards for the exact length of an inch have varied, it is equal to exactly 25.4 mm. The inch is a popularly used customary unit of length in the United States, Canada, and the United Kingdom.
The centimeter (symbol: cm) is a unit of length in the metric system. It is also the base unit in the centimeter-gram-second system of units. The centimeter practical unit of length for many everyday measurements. A centimeter is equal to 0.01 (or 1E-2) meter.
To calculate a inch value to the corresponding value in centimeters, just multiply the quantity in inches by 2.54 (the conversion factor).
centimeters = inches * 2.54
The factor 2.54 is the result from the division 1 / 0.393701 (centimeter definition). Therefore, another way would be:
centimeters = inches / 0.393701
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