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Metal Roofing Sheet Calculator

Estimate corrugated metal sheets, screws, and overlaps for roofing projects. Supports standard global profiles (R-Panel, U-Panel, Corrugated) and provides visual layout logic to minimize waste.

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Category Roofing
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About

Estimating metal roofing requires more than simple area multiplication. The "effective width" of a sheet determines actual coverage, as side overlaps consume material. Failure to account for side laps and end laps often leads to material shortages mid-project, incurring shipping delays and extra costs.

This tool calculates the total number of sheets required by analyzing the roof dimensions against specific panel profiles. It accounts for side overlap (coverage loss) and calculates the linear footage of screw fasteners needed based on standard structural density guidelines. It is designed for both DIY shed projects and professional residential re-roofing.

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Formulas

The number of sheets is derived from the effective coverage width (Weff) and the total roof width (Wroof).

Rows = ceil(WroofWeff)

Total Sheets = Rows × ceil(LroofLsheet − Lapend)

Screws = Areasqft × 0.8

Screws are estimated at 80 per 100 sq.ft. allowing for stitching laps and purlin attachments.

Reference Data

Profile TypeTotal WidthOverlapEffective Width
Standard Corrugated26"2"24"
R-Panel (PBR)38"2"36"
U-Panel38"2"36"
Metric Corrugated1050mm50mm1000mm
Standing Seam18"N/A (Seam)16"

Frequently Asked Questions

Total width is the physical width of the metal sheet from edge to edge. Effective width is the coverage area after the sheet has been overlapped with the adjacent sheet (usually 1 or 2 corrugations).
For roof slopes less than 4:12, an end lap of at least 6-8 inches (15-20cm) is recommended to prevent water capillary action. For steeper roofs, 4-6 inches is standard.
This calculator focuses strictly on the field sheets and fasteners. Ridge caps, rake trim, and drip edge calculations require linear measurements of the roof perimeter.
Standard residential patterns usually place screws alongside the rib (in the flat) for R-Panel, or on top of the rib for corrugated, typically every 24 inches on center along the purlins.