To convert length x width dimensions from feet to centimeters we should multiply each amount by the conversion factor. One foot equals 30.48 centimeters, in order to convert 21 x 645 feet to cm we have to multiply each amount of feet by 30.48 to obtain the length and width in centimeters. In this case to convert 21 x 645 feet into cm we should multiply the length which is 21 feet by 30.48 and the width which is 645 feet by 30.48. The result is the following:
21 x 645 feet = 640.08 x 19659.6 cm
A foot (symbol: ft) is a unit of length. It is equal to 0.3048 m, and used in the imperial system of units and United States customary units. The unit of foot derived from the human foot. It is subdivided into 12 inches.
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 foot value to the corresponding value in centimeters, just multiply the quantity in feet by 30.48 (the conversion factor).
centimeters = feet * 30.48
The factor 30.48 is the result from the division 1 / 0.03281 (centimeter definition). Therefore, another way would be:
centimeters = feet / 0.03281
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