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A 2,000 sq ft roof at 6/12 pitch covers about 2,236 sq ft of actual sloped surface area (using a 1.118 multiplier). At 3 bundles per square plus 15% waste, that works out to roughly 78 bundles of architectural shingles, or 26 squares total. This article walks through the full calculation including ridge cap, starter strip, drip edge, and underlayment for the same 2,000 sq ft home, with a complete materials list and budget estimate.
The short answer is about 74 bundles — but only if "2,000 square feet" means the roof surface rather than the house. A 2,000 square foot footprint at a 6/12 pitch is 2,236 square feet of roof, and that difference is nearly a whole square of shingle.
| Pitch | Roof area | Squares with 10% waste | Bundles at 3/square |
|---|---|---|---|
| 4/12 | 2,108 sq ft | 23.2 | 70 |
| 6/12 | 2,236 sq ft | 24.6 | 74 |
| 8/12 | 2,404 sq ft | 26.4 | 80 |
| 10/12 | 2,603 sq ft | 28.6 | 86 |
| 12/12 | 2,828 sq ft | 31.1 | 94 |
The spread from 4/12 to 12/12 on the same house is about 15 bundles — roughly a fifth more material for the same footprint.
The figure people usually have is the floor area of the house, not the roof, and the two differ by the pitch. These work both readings side by side.
100 sq ft · 200 sq ft · 400 sq ft · 1,000 sq ft · 1,200 sq ft · 1,500 sq ft · 1,800 sq ft · 2,000 sq ft · 2,400 sq ft · 2,500 sq ft · 3,000 sq ft
About 74 bundles if 2,000 square feet is the footprint at a 6/12 pitch — that is 2,236 square feet of roof, roughly 24.6 squares with 10% waste, at three bundles per square.
That is the question that decides the answer. A 2,000 square foot footprint at 6/12 is 2,236 square feet of roof. A two-storey 2,000 square foot house has a roof over roughly half that footprint.
Considerably. The same 2,000 square foot footprint needs about 15 more bundles at 12/12 than at 4/12 — roughly a fifth more material for the same house.
About 3 rolls of synthetic underlayment, roughly 38 pounds of nails, plus starter strip, ridge cap and drip edge by the linear foot, and ice barrier at the eaves in a freezing climate.
Different size or pitch? The shingle calculator runs the same arithmetic for any roof.