Metal Roofing Panel Calculator — ft to panels, screws, cost
How to use this calculator
Enter your roof dimensions two ways: direct roof area in square feet, or length × width plus roof pitch. Select a panel type — standing seam, corrugated, or R-panel/PBR — then choose panel length and overlap settings. Results update instantly with panel count, ridge cap, trim, screws, and optional cost.
Panel types — Standing seam (16–18″ coverage), Corrugated (26″ coverage), R-Panel/PBR (36″ coverage).
Pitch adjustment — When entering footprint dimensions, the calculator applies the pitch multiplier to get true roof area.
Cost — Enter price per panel or per linear foot for a full material estimate.
Saved Calculations
| Time | Type | Area ft² | Panels | Ridge | Trim | Screws | Total $ |
|---|
How to Calculate Metal Roofing Panels
This calculator estimates the number of metal roofing panels, ridge cap pieces, trim, and screws needed to cover a roof. Enter the roof dimensions in feet and inches — either as direct area or as length × width with a pitch multiplier — then select a panel type. Standing seam panels provide 16–18 inches of coverage width, corrugated panels cover 26 inches, and R-panel/PBR panels cover 36 inches after side lap.
Formulas Used
Pitch factor = √(1 + (rise/12)²). Actual roof area = footprint length × width × pitch factor × number of sides. Panels across = ⌈roof width ÷ panel coverage width⌉. Rows lengthwise = ⌈roof length ÷ (panel length − endlap)⌉ if panels are shorter than the roof. Screws ≈ 80 per roofing square (100 ft²). Ridge cap = ⌈ridge length ÷ 10 ft⌉ with overlap.
FAQ
How many screws per panel? Typically 60–80 screws per 100 ft² (one roofing square). Panels get fastened at every rib on eave/ridge rows and every other rib in the field.
What overlap do I need? Side overlap is built into the panel coverage width. End overlap (endlap) is typically 6″ for standard pitch, 9–12″ for low-slope applications below 3:12.
