# Keyword Analysis & Research: figuring out square footage of roof

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How do I calculate the square footage of my roof?

Then, multiply length x width to get the square footage of each plane. Finally, calculate your roof's total square footage by simply adding the square footage of each of the planes together. ... Simply measure length (A) x width (B): A x B = 120' x 100' = 12,000 sq. ft. for the total square footage of the roof.

How do you calculate the square footage of a 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. 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.

What is the average square footage of a roof?

Helpful Information. A few tips: To figure the size of your roof, see our square footage calculator. In roofing terminology, a "square" is 100 square feet. Composition shingles (asphalt or fiberglass) come in bundles that cover 1/3 square. Roofing comes in rolls 3 feet wide and 36 feet long, for a coverage of about 1 square.