Exterior
Roofing Calculator
Estimate asphalt shingle bundles by roof area, pitch factor, and waste.
Inputs
4/12=1.06, 6/12=1.12, 8/12=1.20
Live estimate
Bundles needed
56
- Actual roof area
- 1,680 sq ft
- With waste
- 1,848 sq ft
- Roofing squares
- 18.48
- Material cost
- $2,240
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How it's calculated
Actual roof area = footprint × pitch factor.
With waste = actual × (1 + waste %).
Squares = area ÷ 100. Bundles = ceil(area ÷ bundle coverage).
Material assumptions
- Pitch factor: 4/12 = 1.06, 6/12 = 1.12, 8/12 = 1.20, 12/12 = 1.41.
- 3-tab shingle: 3 bundles per square (100 sq ft).
- Architectural: often 3 bundles per square as well, but heavier.
Frequently asked questions
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Related calculators
Roofing quantity can vary significantly based on valleys, hips, penetrations, and waste. Get a measurement from your roofer.