Calculating Square Footage Of A Pitched Roof

Convert the area to roofing squares.

Calculating square footage of a pitched roof.

Divide any irregularly shaped areas of the roof into more manageable triangles and rectangles then calculate square footage for those individual elements and add them to get the total square footage. See the image below for more explanation on rise run and pitch. Once you have your roof s pitch divide the number by 12. Multiply by the square footage of a single floor of your house.

Because each 100 square feet of roof is one roofing square divide. Multiply the length by the width to arrive at. For example if your roof s pitch is 4 in 12 you would divide 4 by 12. 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.

A roof s pitch is determined by how much it rises vertically for every foot it runs horizontally. To accurately calculate the area of your roof you must first determine its slope or pitch. How do you calculate square footage for a roof. This would yield 1 3.

Thus a moderate 6 in 12 roof pitch means that the roof rises 6 inches vertically for every 12 horizontal inches it runs. 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.