per square foot (psf):
PSF is short for "per square foot" and is a unit of measure that we use in association with price.
Example: $1.50 psf x 200 sq.ft. = $300.00
So what is a "square foot"?
A "square foot" is a unit of area measurement equal to a square measuring one foot on each side, see example below; 0.0929 square meters. Abbr.: ft2, sq. ft.
Using the formula above, let's bring this all together.
Example: You have a wall on your house that is 10 feet tall by 10 feet wide. ( 10' x 10' )
What is the square footage of this wall?
Answer: 10' x 10' = 100 ft2 (100 ft2 = 100 SqFt = 100 sq.ft.)
Now if a product costs $1.50 psf (per square foot) and you need 100 sq.ft. your cost would be $150.00.
$1.50 psf x 100 sq.ft. = $150.00