You do not. A square foot is a measure of area, with dimensions [L2]. A linear foot is a measure of distance, with dimensions [L]. Basic dimensional analysis teaches that you cannot convert between measures with different dimensions such as these without additional information.
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400 square feet. To calculate square feet simply multiply length by width - the result is the area in square feet.
Just about 400
400 by 400 feet = 160,000 square feet 160,000 square feet = 3.6730946 acres
400 square feet. This is an easy calculation - just multiply the length in feet by the width in feet. The answer is the number of square feet.
There are 44.44 square yards in a room that is 20 feet x 20 feet (400 square feet). 20 feet x 20 feet = 400 square feet 400 square feet x 0.111111111 square yards/1 square foot = 44.44 square yards 1 square foot = 0.111111111 square yards