Formula To Find Square Footage Of A Roof

For example if your roof s pitch is 4 in 12 you would divide 4 by 12.

Formula to find square footage of a roof.

Multiply the length and width of each square or rectangle shaped plane. Multiply the number of roofing squares for a medium pitch roof by 1 12 to 1 25 or by 1 3 to 1 42 for a high pitch roof to get the square roof area. How to calculate square feet of a roof step 1. L h 2 area calculating an area of a triangle when estimating a roof.

Calculate each plane separately. If your number is 1 3 squared would yield 1 9 after that add 1 to your number. Things you will need steel tape measure. Calculating the area true once you have your roof s pitch divide the number by 12.

Next square your result. 1 9 1. Add 1 then take the square root. Multiply by the square.

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. The calculator cannot account for complex shapes based on a measurement of square footage alone. Include dormers the small outjuttings over attic. 1 roof square 100 square feet.

So keeping with our roof pitch of 4 this gives us 1 9. A gable roof and a hip roof of the same length and slope will have identical areas. 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.

Gable or hip roof. So if you divide your answer of a product of length times height by two you will get the area of a triangle. In cases where a roof has a complex shape such as in the image to the right measuring the dimensions and areas of each part of the roof to calculate total area will result in a more accurate measurement of area.