Formula For Roofing Area

1 roof square 100 square feet.

Formula for roofing area.

Divide your roof pitch by 12. Next square your result. 1 9 1. Calculating an area of a triangle when estimating a roof.

Roof pitch is given as the number of inches in height change over the distance of one foot. The answer to this is the total number of squares on your roof for which you need to purchase shingles. If your number is 1 3 squared would yield 1 9 after that add 1 to your number. For example if your roof s pitch is 4 in 12 you would divide 4 by 12.

The length l times the height h of a triangle is twice its area a2. So if you divide your answer of a product of length times height by two you will get the area of a triangle. Dividing by 12 gives the ratio of inches in rise per distance.