Calculate roofing squares, bundles of shingles, and underlayment needed for your roof with pitch adjustment.
squares needed
| Footprint Area | 1200 ft² |
| Actual Roof Area | 1342 ft² |
| With Waste | 1476 ft² |
| Roofing Squares | 14.76 sq |
| Bundles of Shingles | 45 bundles |
| Underlayment Rolls | ~4 rolls |
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Actual Area = Footprint × Pitch Multiplier
Squares = (Actual Area × waste) ÷ 100
Bundles = Squares × 3 (standard shingles)
One roofing square = 100 sq ft. Most bundles of shingles cover 1/3 square (33 sq ft), so 3 bundles = 1 square.
Steeper pitches have more actual surface area. A 12/12 pitch needs ~41% more material than a flat roof.
Simple gable roofs: 10%. Complex roofs with hips/valleys: 15%. Many dormers: 20%.
Typically 4 nails per shingle. In high-wind areas, use 6 nails.
Calculations are for educational purposes only. Consult a qualified financial advisor for personalized advice.