Calculating Square Footage Of A Pitched Roof

A 12 in 12 pitch is a steep 45 degree angle roof.

Calculating square footage of a pitched roof.

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. 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. How do you calculate square footage for a roof. Measure the ground dimensions of the house using a tape measure and write down these dimensions.

See the image below for more explanation on rise run and pitch. 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. For example if your roof s pitch is 4 in 12 you would divide 4 by 12. Convert the area to roofing squares.

To accurately calculate the area of your roof you must first determine its slope or pitch. Multiply the length by the width to arrive at. Once you have your roof s pitch divide the number by 12. Because each 100 square feet of roof is one roofing square divide.

This would yield 1 3. A roof s pitch is determined by how much it rises vertically for every foot it runs horizontally. Thus a moderate 6 in 12 roof pitch means that the roof rises 6 inches vertically for every 12 horizontal inches it runs.