How to Calculate Shingles Needed
Shingles are sold in bundles, and priced per "roofing square" (100 sq ft). The number of bundles per square depends on the shingle type:
Roofing Squares = Total Roof Area ÷ 100
Bundles = Squares × Bundles Per Square
3-Tab: 3 bundles/square | Architectural: 3-4 bundles/square
- 3-Tab Shingles: 3 bundles per roofing square. Lightweight, affordable, 15-20 year lifespan.
- Architectural Shingles: 3-4 bundles per square (varies by brand). Thicker, more dimensional, 25-30 year lifespan.
- Premium/Designer: 4-5 bundles per square. Highest quality, 30-50 year lifespan.
- Waste Factor: Always add 10-15% for cuts, overlaps, and damaged shingles.