To convert length x width x height dimensions from inches to centimeters we should multiply each amount by the conversion factor. One inch equals 2.54 centimeters, in order to convert 18 x 21 x 12 inches to cm we have to multiply each amount of inches by 2.54 to obtain the length, width and height in centimeters. In this case to convert 18 x 21 x 12 inches into cm we should multiply the length which is 18 inches by 2.54, the width which is 21 inches by 2.54, and the height which is 12 inches by 2.54. The result is the following:
18 x 21 x 12 inches = 45.72 x 53.34 x 30.48 cm
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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