Roofing shingles calculator
Enter your roof and get a material takeoff: shingle bundles, underlayment, starter, ridge caps and nails. Waste factors are shown, not hidden.
| Roof area | |
|---|---|
| Squares (with waste) | |
| Shingle bundles (3/square) | |
| Underlayment rolls (4 sq/roll synthetic) | |
| Starter strip bundles (~105 lf each) | |
| Ridge cap bundles (~33 lf each) | |
| Roofing nails, lbs (≈2.5 lbs/square) |
Assumes standard architectural shingles. Perimeter and ridge lengths are estimated from footprint geometry — round up when buying.
FAQ
How many bundles of shingles per square?
Three bundles cover one square (100 sq ft) for standard architectural shingles. Heavier designer shingles can take four or five — check the wrapper.
How much waste should I add?
10% for a simple gable roof, 15% for hips, valleys and dormers. Complex cut-up roofs can hit 20%.
How do I measure my roof from the ground?
Multiply the house footprint by a pitch factor: 1.05 for low slopes (4/12), 1.12 for average (6/12), 1.25 for steep (9/12), then add overhangs.
Want the installed cost, not just materials? See city cost guides.