Formula
How this estimate works
bundles = roofing squares x bundles per square, rounded up
A 14.75 square roof using 3 bundles per square needs about 45 bundles after rounding.
Estimate shingles and underlayment
The calculator converts roof area into roofing squares, then estimates shingle bundles using the selected bundles per square. Underlayment rolls are estimated from roll coverage.
Materials not included
Roofing projects often need starter shingles, ridge caps, drip edge, flashing, nails, vents, ice barrier, and disposal. Add those separately for a full project estimate.
Assumptions used
- One roofing square equals 100 square feet.
- Shingle bundles are rounded up to whole bundles.
- Underlayment rolls are estimated from entered roll coverage.
Before you order materials
- Confirm bundle coverage for the exact shingle product.
- Add starter, ridge, flashing, drip edge, nails, and ventilation separately.
- Use a higher waste factor for roofs with hips, valleys, and dormers.
Frequently asked questions
How many shingle bundles are in a roofing square?
Many asphalt shingles use about 3 bundles per square, but premium or specialty shingles may use different bundle counts.
How much waste should I add for roofing?
Simple roofs may use around 10% waste, while cut-up roofs with valleys, hips, and dormers may require more.
Does this calculate labor cost?
No. It estimates selected material quantities and basic material cost, not labor, permits, tear-off, disposal, or accessories.