One foot equals 12 inches, to convert 20640 feet to inches we have to multiply the amount of feet by 12 to obtain the width, height or length in inches. 20640 feet is equal to 20640 feet x 12 = 247680 inches. The result is the following:
20640 feet = 247680 inches
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.
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.
To calculate a foot value to the corresponding value in inches, just multiply the quantity in feet by 12 (the conversion factor).
inches = feet * 12
The factor 12 is the result from the division 1 / 0.0833333 (inch definition). Therefore, another way would be:
inches = feet / 0.0833333
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