How this worksheet works
From roof area to whole bundles
Bundle coverage varies by shingle line. Enter the actual coverage shown by the manufacturer or supplier rather than relying on a universal bundles-per-square rule.
How to use it
- Enter total measured sloped roof area.
- Set waste and the coverage of one bundle.
- Round up the calculated order to whole bundles and verify package coverage.
Useful for
- Asphalt shingle ordering
- Comparing products with different bundle coverage
- Adding a transparent waste allowance
Assumptions
- Input area is already the sloped roof area
- All bundles have the entered coverage
- Only whole bundles can be ordered
Limitations
- Starter, ridge cap, underlayment, and flashing are not included
- Does not account for dye-lot availability or minimum order quantities
- Manufacturer coverage controls if it differs from the default
Common checks
Questions about this calculator
How many square feet are in a roofing square?
One roofing square is 100 square feet of roof surface.
Why does bundle coverage vary?
Shingle dimensions, exposure, design, and packaging differ. Use the published coverage for the exact product.