A roofing square = 100 square feet of roof area. Roofers use this unit to price materials and labor consistently.
How to Calculate
1. Measure roof footprint (length Γ width)
2. Multiply by pitch factor (e.g., 4/12 pitch = Γ1.054, 6/12 = Γ1.118, 8/12 = Γ1.202)
3. Divide total sq ft by 100 = number of squares
Materials per Square
- 3-tab shingles: 3 bundles per square
- Architectural shingles: 3β4 bundles per square
- Underlayment: 1 roll per 2β4 squares