Formula For Square Footage Of A Roof

Multiply the number of roofing squares for a medium pitch roof by 1 12 to 1 25 or by 1 3.

Formula for square footage of a roof.

Multiply the length and width of each square or rectangle shaped plane. Once you have your roof s pitch divide the number by 12. 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.

L h 2 area calculating an area of a triangle when estimating a roof. So keeping with our roof pitch of 4 this gives us 1 9. Adding 1 gives us 1 1 9 10 9 then taking the square root gives us about 1 0541. Steep roofs measure your house at ground level then add in the roof s overhang for greater accuracy.

Include dormers the small outjuttings over attic windows. Calculate each plane separately. The calculator cannot account for complex shapes based on a measurement of square footage alone. Multiply by the square.

So if you divide your answer of a product of length times height by two you will get the area of a triangle. 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 this number by your most recent result to get the estimated square footage of your roof.

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. How to calculate square feet of a roof.