Total Panels
93
Roof Area
1,342 sq ft
Estimated Cost
$6,641
Common pitches: 4:12 (moderate), 6:12 (standard), 8:12 (steep)
Typical: 10% for simple roofs, 15-20% for complex shapes
Inputs
Result
Area = 40 × 30 × 1.118 = 1,341.6 sq ft. With waste: 1,475.8 sq ft. Panel area = 1.33 × 12 = 16 sq ft. Panels = ⌈1,475.8 / 16⌉ = 93. Cost = 1,475.8 × $4.50 = $6,641.
Inputs
Result
Area = 60 × 30 × 1.054 = 1,897.4 sq ft. With waste: 2,087.1 sq ft. Panel area = 2 × 12 = 24 sq ft. Panels = ⌈2,087.1 / 24⌉ = 87. Cost = 2,087.1 × $2.50 = $5,218.
Calculate roof area with pitch (L × W × pitch multiplier), add 10% waste, then divide by panel coverage area (panel width × panel length). For a 1,200 sq ft roof with 16" standing seam panels at 12 ft long: 1,320 sq ft / (1.33 × 12) = 83 panels.
Metal roofing costs $2.50-$8.00 per square foot for materials. Corrugated: $2.50-4.00/sq ft, Ribbed/R-Panel: $3.00-4.50/sq ft, Standing seam: $4.50-8.00/sq ft. Installation adds $3-7/sq ft for labor.
| Panel Type | Material Cost/sq ft | Installed Cost/sq ft | Best For |
|---|---|---|---|
| Corrugated | $2.50–$4.00 | $5.50–$11.00 | Barns, sheds, budget projects |
| Ribbed/R-Panel | $3.00–$4.50 | $6.00–$11.50 | Commercial, agricultural |
| Standing Seam | $4.50–$8.00 | $7.50–$15.00 | Residential, modern homes |
Use approximately 80 screws per 100 sq ft of metal roofing. Each panel typically needs screws every 12-24 inches along each rib, plus additional screws at overlaps, eaves, and ridge. Budget 80 screws per panel as a safe estimate.
Metal roofing lasts 40-70 years depending on material. Corrugated steel: 40-60 years, Standing seam: 50-70 years, Aluminum: 50+ years, Copper: 70-100+ years. Far outlasts asphalt shingles at 15-30 years.
| Material | Lifespan | Rust Risk | Cost Level |
|---|---|---|---|
| Corrugated Steel | 40–60 years | Moderate (needs coating) | Low |
| Standing Seam Steel | 50–70 years | Low (hidden fasteners) | Medium |
| Aluminum | 50+ years | None | Medium–High |
| Copper | 70–100+ years | None (develops patina) | High |
Read our guide
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Last Updated: Mar 9, 2026
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