Calculating Square Footage Of A Pitched Roof

How do you calculate square footage for a roof.

Calculating square footage of a pitched roof.

Multiply by the square footage of a single floor of your house. For example if your roof s pitch is 4 in 12 you would divide 4 by 12. To accurately calculate the area of your roof you must first determine its slope or pitch. A 12 in 12 pitch is a steep 45 degree angle roof.

Once you have your roof s pitch divide the number by 12. Measure the ground dimensions of the house using a tape measure and write down these dimensions. If you don t want to do a lot of measuring you can use your pitch calculation to get an estimated square footage of your roof. A roof s pitch is determined by how much it rises vertically for every foot it runs horizontally.

So continuing our example if you ve got a two story house with a total square footage of 2 700 square feet with each floor having. Thus a moderate 6 in 12 roof pitch means that the roof rises 6 inches vertically for every 12 horizontal inches it runs. This would yield 1 3. Given pitch and a horizontal area measurement multiply the horizontal area by a correction factor corresponding to pitch provided in the table below to determine the actual area of the roof to be used in the roofing material calculator.

See the image below for more explanation on rise run and pitch. Convert the area to roofing squares. Because each 100 square feet of roof is one roofing square divide.