Formula For Square Footage Of Roof

L h 2 area calculating an area of a triangle when estimating a roof.

Formula for square footage of roof.

Multiply the length and width of each square or rectangle shaped plane. Steep roofs measure your house at ground level then add in the roof s overhang for greater accuracy. The calculator cannot account for complex shapes based on a measurement of square footage alone. The only difference in this calculation to the one for a gable roof area is the amount of the ridge.

Calculate each plane separately. The length l times the height h of a triangle is twice its area a2. Adding 1 gives us 1 1 9 10 9 then taking the square root gives us about. The square footage of a hip roof area is identical to the square footage of a gable roof of the same size.

Square the result of step 1. 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. 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. 1 roof square 100 square feet.

Once you have your roof s pitch divide the number by 12. Include dormers the small outjuttings over attic windows. 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. How to calculate square feet of a roof.

So if you divide your answer of a product of length times height by two you will get the area of a triangle. Multiply this number by your most recent result to get the estimated square footage of your roof. Multiply the number of roofing squares for a medium pitch roof by 1 12 to 1 25 or by 1 3. Add 1 then take the square root.

Measure the length and width of every roof plane or surface.