⌂PROPERTY
Roofing Calculator
Estimate roof surface area and roofing squares from building footprint, roof pitch and waste.
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Formula
Roof area = footprint area × √(1 + (rise ÷ 12)^2). Roofing squares = roof area ÷ 100 × (1 + waste%).
Roof area = footprint area × √(1 + (rise ÷ 12)^2). Roofing squares = roof area ÷ 100 × (1 + waste%).
How it works
1
Enter the building footprint.
2
Enter roof rise per 12 inches of run.
3
Review roof area and roofing squares.
Important notes
This simplified model assumes a consistent pitch over the footprint; dormers, hips and valleys can increase material needs.