Real Estate & Civil
Roofing Material Estimator
Sloped roof area, roofing squares, shingle bundles, and underlayment rolls from a building footprint and pitch.
Steeper pitches need more shingles per plan sq ft.
$
Bundles needed
45
Roofing squares
14.8
Underlayment rolls
4
Breakdown
| Plan (footprint) area | 1,200 sq ft |
| Sloped (actual) roof area | 1,476 sq ft |
| Roofing squares (1 square = 100 sq ft) | 14.76 |
| Estimated shingle cost | $1,575.00 |
Based on standard 3-bundle-per-square asphalt shingles and 400 sq ft synthetic underlayment rolls — adjust for the specific products you’re buying.
Formula
Footprint to sloped area
Sloped area = Plan area × Pitch factor
Plan areaLength × width of the building footprint
Pitch factor√(rise² + run²) ÷ run — steeper pitch, bigger factor
Square100 sq ft of roof coverage, the standard ordering unit
Bundle1/3 of a square for standard asphalt shingles
FAQ
Common questions
A sloped roof has more surface area than the flat footprint below it — the steeper the pitch, the bigger the difference. This tool multiplies the plan (footprint) area by a pitch-specific factor to estimate the actual sloped area that needs covering.