To convert length x width dimensions from feet to millimeters we should multiply each amount by the conversion factor. One foot equals 304.8 millimeters, in order to convert 21 x 20 feet to mm we have to multiply each amount of feet by 304.8 to obtain the length and width in millimeters. In this case to convert 21 x 20 feet into mm we should multiply the length which is 21 feet by 304.8 and the width which is 20 feet by 304.8. The result is the following:
21 x 20 feet = 6400.8 x 6096 mm
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 millimeter (symbol: mm) is a unit of length in the metric system, equal to 1/1000 meter (or 1E-3 meter), which is also an engineering standard unit. 1 inch = 25.4 mm.
To calculate a foot value to the corresponding value in millimeters, just multiply the quantity in feet by 304.8 (the conversion factor).
millimeters = feet * 304.8
The factor 304.8 is the result from the division 1 / 0.003281 (millimeter definition). Therefore, another way would be:
millimeters = feet / 0.003281
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