Measure the length in feet
Measure the width in feet
Multiply length by width
Use the formula: square feet = length × width
For irregular spaces, divide the area into smaller rectangles
Calculate each rectangle’s square footage
Add the square footage totals together
Round measurements to the nearest inch or tenth of a foot if needed
Convert inches to feet by dividing by 12 before multiplying
For triangles, use the formula: square feet = 0.5 × base × height
For circles, use the formula: square feet = 3.14 × radius × radius