Observed arrival · 2026-09-27
Roofline’s Roof Area Calculator
A browser-based calculator estimates roof surface area, roofing squares, and material quantities from dimensions, pitch, overhang, and waste allowance.
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- Homeowners and roofers estimating material quantities
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- A worked example distinguishes 1,502.64 square feet of sloped roof from the 10% planning allowance added afterward.
Field notes
The form starts with building dimensions measured at the exterior walls, then adds the overhang before applying the pitch’s slope factor. Separate sections can be combined, while the page notes that an L-shaped roof should be represented with non-overlapping sections and that shared edges may need manual adjustment. Material quantities are planning estimates, with shingle bundles rounded up according to the selected bundle coverage.
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