Metal Roofing Panel Calculator — m to panels, screws, cost
How to use this calculator
Enter roof dimensions in meters and centimeters — either as direct area or length × width plus roof pitch. Select a panel type: standing seam (400–475 mm coverage), corrugated (660 mm), or R-panel/PBR (914 mm). Results update instantly with panel count, ridge cap, trim, screws, and optional cost.
Panel types — Standing seam 400–475 mm, Corrugated 660 mm, R-Panel 914 mm coverage width.
Pitch — Entered as degrees. The calculator applies the pitch factor (1/cos θ) to convert footprint to actual roof area.
Cost — Select your currency and enter price per panel for a full material estimate.
Saved Calculations
| Time | Type | Area m² | Panels | Ridge | Trim | Screws | Total |
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How to Calculate Metal Roofing Panels (Metric)
This calculator estimates the number of metal roofing panels, ridge cap pieces, trim, and screws needed. Enter dimensions in meters and centimeters — either as direct area or length × width with pitch in degrees. Panel types include standing seam (400–475 mm coverage), corrugated (660 mm), and R-Panel/PBR (914 mm).
Formulas
Pitch factor = 1 / cos(angle°). Actual roof area = footprint L × W × pitch factor × sides. Panels across = ceil(width / panel coverage). Screws ≈ 8 per m². Ridge cap = ceil(ridge / 1.9 m effective).
FAQ
What coverage width should I use? Standing seam 400–475 mm after interlocking, corrugated 660 mm after side lap, R-panel 914 mm. Always confirm with your panel supplier.
What endlap for low pitch? For slopes below 15°, use 200–250 mm endlap with sealant. Standard pitch uses 150 mm.
