Roofing Squares Calculator
Roofing material is often sold by the square (100 sq ft). A pitched roof has more surface than its footprint. A simple pitch factor approximates that extra area. Complex roofs need a professional takeoff.
Pitch factor1.118
Roof surface1,968 sq ft
Squares19.68
Rough planning only.
Formula
Factor = √(1 + (rise/12)²). Squares = footprint × factor × (1+waste) ÷ 100.
How to use this calculator
- Enter plan-view area.
- Enter pitch as rise in 12 inches of run (6 is a 6/12 roof).
- Read squares including waste.
Examples
1,600 sq ft, 6/12, 10% waste
Factor ≈ 1.118. About 19.7 squares.
FAQ
Hips and valleys?+
They increase waste. Ask a roofer for a measured estimate.
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