Roofing Material Calculator
Roof Length (ft)
Roof Width (ft)
Roof Pitch (rise/12)
3/12 (Low)
4/12
5/12
6/12 (Medium)
7/12
8/12
9/12
10/12 (High)
11/12
12/12 (Steep)
Waste Factor (%)
Calculate Materials
Results
Formula:
Area = (Length × Width) × Pitch Factor. Pitch Factor = sqrt((pitch/12)^2+1). Area with Waste = Area × (1 + waste/100). Squares = Area with Waste / 100. Bundles = Squares × 3 (for 3-tab shingles).