Roof shingle calculator
Convert the horizontal roof projection to sloped area using one pitch, then add waste and divide by coverage per bundle.
Shopping estimate
Enter your measurements to see an estimate.
How it works
Convert the horizontal roof projection to sloped area using one pitch, then add waste and divide by coverage per bundle. Measure complex slopes separately.
Worked example
- Net area
- 100 m²
- Roof rise per 12 horizontal units
- 6 :12
- Coverage per bundle
- 3 m²
- Waste allowance
- 10 %
Result 41 bundles
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