Roofing Calculator
Rise per 12″ of run. 0 = flat.
Roof area1342 sq ft · 124.6 m²
Squares (+10% waste)14.8 sq
Shingle bundles (~3/square)45 bundles
Slope factor1.118 (6:12)
Footprint1200 sq ft
- Slope factor 1.118 at 6:12 — roof area is the 1200 sq ft footprint × that factor.
- A "square" is 100 sq ft. Order ~10% extra for waste, starter, and hip/ridge caps (typical — check your product).
- Bundles assume ~3 per square (typical 3-tab / architectural). Complex roofs — dormers, valleys, overhangs beyond the footprint — add area; measure or add margin.