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Roofing Shingle Calculator — Roof Area, Squares, Bundles & Cost

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Roof input Footprint length (ft) Footprint width (ft) Roof pitch rise per 12 Waste allowance (%) Bundles per roofing square Use the exact shingle package coverage.Price per bundle (optional)

Calculated result

45 bundles · 14.76 roofing squares

Roof surface before waste: 1,341.6 sq ft

Pitch factor: 1.11803

Order area with 10% waste: 1,475.8 sq ft

3 bundles per square

Optional bundle price not entered.

Show the working

1. Pitch factor = √(12² + 6²) ÷ 12 = 1.11803; surface = 40 × 30 × 1.11803 = 1,341.6 sq ft.
2. Order area = 1,341.6 × 1.1 = 1,475.8 sq ft.
3. Roofing squares = 1,475.8 ÷ 100 = 14.758.
4. Field bundles = ceil(14.758 × 3) = 45.

Field-shingle planning only. Complex roof geometry and separate starter, ridge/hip, underlayment, flashing and accessory quantities require their own takeoffs.

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