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Now multiply the factor below times the footprint of your roof. Pitch Factor4/12 1.054 5/12 1.083 6/12 1.118 7/12 1.157 8/12 1.202 9/12 1.25 10/12 1.302 11/12 1.356 12/12 1.414 In our example, with a 6 in 12 roof, the roof area would equal 1600 x 1.118 = 1788.8 ft. Shingles are sold by the square, with a square being 100 ft.. Therefore you would need at least 18 squares of shingles. In addition to calculating the area of a roof, you must also determine how many shingles you will need for the ridges and hips. You will also need to know how much of valley flashing you need, eave protection, and so on. There are many roofing calculators on the Internet. For example go to

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