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Roofing Calculator
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Roof area from footprint and pitch (X:12 format). Squares, bundles of shingles, ridge cap, underlayment, drip edge. Common pitches with slope factors shown.
How to Use
- 1Enter the building footprint length and width
- 2Enter the roof pitch in X:12 format (e.g. 6 for a 6:12 pitch) - the slope factor is shown
- 3Select your waste factor (10% standard, 15% for complex roofs)
- 4Click Calculate to see roof area in sq ft, squares, bundles, ridge cap, and underlayment
- 5Cost estimate: enter shingle price per square for a materials budget
Features
- Roof area from footprint + pitch (X:12 format)
- Common pitches shown with slope factors (3:12 to 12:12)
- Squares, bundles, ridge cap, underlayment
- 10–15% waste factor adjustment
- Drip edge length from perimeter
- 100% browser-based
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