Roofing calculators

3 free calculators · instant · nothing you enter is uploaded

A roof is measured in squares, and the area of the roof is always larger than the footprint of the building because of the pitch and the overhang. These calculators work from the plan area and a roof pitch or a rise-and-run ratio to find the true surface area, then convert that into bundles of shingles with the correct waste allowance, and size gutters from the roof area they have to drain. Getting the roof area right is what keeps the material order and the delivery in step.