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Roofing Calculator
Convert roof footprint and pitch into roof area, roofing squares and shingle bundles.
How it works
Pitch factor = √(1 + (pitch ÷ 12)²). Roof area = footprint × factor. Squares = area ÷ 100. Most 3-tab and many architectural shingles are 3 bundles per square; check the wrapper.
Examples
- 1,500 ft² footprint at 6/12: factor 1.118 → 1,677 ft² → 16.8 squares before waste.
FAQ
What is a roofing square?
100 ft² (9.29 m²) of roof surface.