Roofing Calculator
True roof area from footprint and pitch, squares + underlayment.
ROOFING
Asphalt Shingles (Architectural)
Fiberglass-mat shingles, the North American residential standard. Sold by the bundle; three bundles per roofing square (100 ft²).
Typical coverage
33.3 ft²/bundle
1/3 square; check product — 3-tab differs slightly
Sold as
Bundles
3 per square
Field-tested tips
- +10–15% waste for hips, valleys and starter
- Starter strip and ridge cap are separate products
- Steep-slope work is professional territory