Calculate roofing materials including shingles, underlayment, and ridge caps for your roof.
Most shingles come 3 bundles per square (100 sq ft). Calculate your roof area in squares and multiply by 3.
A roofing square is 100 square feet (9.29 m²). It’s the standard unit for measuring and ordering roofing materials.
Steeper pitches have more surface area. A 6:12 pitch adds about 12% more area than a flat roof; a 12:12 pitch adds about 41%.
Asphalt shingles typically last 20–30 years, concrete tiles 40 years or more, and natural slate far longer. Lifespan depends on the material, the pitch and how exposed the roof is.
Work out the footprint from the ground and multiply by a pitch factor for the slope. Our Roof Area calculator does exactly this from your plan size and pitch.
Calculate the true sloped surface area of a roof from its footprint and pitch, in square feet, square metres and roofing squares.
OpenCalculate the number of plywood or OSB sheathing boards needed to deck a roof, allowing for pitch and waste.
OpenFind the pitch, angle, and slope of your roof from rise and run measurements.
Open