Construction
Roofing Calculator: Shingles and Bundles
Calculate roofing materials.
Order roofing materials correctly.
Squares
1 square = 100sqft. Most roofs 15-30 squares.
Bundles
3 bundles = 1 square. Add 10% waste.
Pitch Factor
- 4/12: 1.05
- 6/12: 1.08
- 8/12: 1.12
- 12/12: 1.30
Frequently Asked Questions
Measure roof?
Ground area × pitch factor.
Bundles per square?
3 bundles = 1 square (100sqft).
Waste?
10% standard. 15% complex roofs.