Roof Square Footage Calculator
Calculate roof square footage from measured area or a simple footprint and roof pitch, then convert the result to roofing squares.
Project measurements
Enter measured roof area directly, or estimate sloped area from a rectangular footprint and pitch.
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Roofing squares—
This is a geometry estimate. Complex hips, valleys, dormers and overhangs can require plane-by-plane measurement.
How this calculator works
If you know the measured roof surface area, the calculator uses that value directly. For a simple rectangular footprint, it can estimate sloped area by multiplying footprint area by the slope factor derived from the rise/run triangle.
For irregular roofs, plane-by-plane measurement is more reliable.