Formula For Square Footage Of A Roof

1 roof square 100 square feet.

Formula for square footage of a roof. Measure the length and width of every roof plane or surface. The length l times the height h of a triangle is twice its area a2. Once you have your roof s pitch divide the number by 12. The calculator cannot account for complex shapes based on a measurement of square footage alone.

So if you divide your answer of a product of length times height by two you will get the area of a triangle. Steep roofs measure your house at ground level then add in the roof s overhang for greater accuracy. Multiply this number by your most recent result to get the estimated square footage of your roof. How to calculate square feet of a roof.

Multiply the number of roofing squares for a low pitch roof by 1 06 to 1 08 to get the square roof area. If your roof is flat or has no more than a 3 in 12 pitch you can calculate its total square footage by simply multiplying the length by the width. Multiply the length and width of each square or rectangle shaped plane. So keeping with our roof pitch of 4 this gives us 1 9.

Include dormers the small outjuttings over attic windows. Multiply by the square. Adding 1 gives us 1 1 9 10 9 then taking the square root gives us about 1 0541. 1 300 x 1 05 1 365 square feet calculating the area true if you want to get the exact area measurement for your roof you can follow these steps.

Add 1 then take the square root. Multiply the number of roofing squares for a medium pitch roof by 1 12 to 1 25 or by 1 3.