Calculating Square Footage Of A Pitched Roof

For example take an area made up of a triangle that s 20 feet high and has a base of 40 feet plus a square that s 40 feet by 40 feet.

Calculating square footage of a pitched roof.

See the image below for more explanation on rise run and pitch. 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. For example if your roof s pitch is 4 in 12 you would divide 4 by 12. Because each 100 square feet of roof is one roofing square divide.

A 12 in 12 pitch is a steep 45 degree angle roof. How do you calculate square footage for a 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. Multiply by the square footage of a single floor of your house.

This would yield 1 3. 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. Measure the ground dimensions of the house using a tape measure and write down these dimensions.

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