To convert length x width dimensions from inches to feet we should multiply each amount by the conversion factor. One inch equals 0.0833333 feet, in order to convert 21 x 18 inches to feet we have to multiply each amount of inches by 0.0833333 to obtain the length and width in feet. In this case to convert 21 x 18 inches into feet we should multiply the length which is 21 inches by 0.0833333 and the width which is 18 inches by 0.0833333. The result is the following:
21 x 18 inches = 1.75 x 1.5 feet
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.
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.
To calculate an inch value to the corresponding value in feet, just multiply the quantity in inches by 0.0833333 (the conversion factor).
feet = inches * 0.0833333
The factor 0.0833333 is the result from the division 1 / 12 (foot definition). Therefore, another way would be:
feet = inches / 12
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