Pounds per square foot (psf) is common in structural and floor-load calculations; psi is per square inch. Since a square foot has 144 square inches, divide psf by 144 to get psi.
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Frequently asked questions
How do you convert psf to psi?
Divide pounds per square foot by 144 (there are 144 square inches in a square foot).
What is a typical floor load?
Residential floors are often designed for around 40 psf live load.