You don't. Square feet is a measure of area and lineal foot is a measure of length Your question is like asking how do you convert Gallons to Inches
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A linear foot is a unit of distance. A square foot is a unit of area. The two units are therefore incompatible.
Lineal foot can be measured on the ground. It is related to an actual measurement. Linear foot is a distance not necessarily measured along the ground. Also linear foot can refer to board feet.
Lineal metres = Square metres/Width of the boards.
There are 144 square inches in a square foot. So, 500 square feet x 144 = 72,000 square inches.
Pounds per square foot x 0.006944 equals psi