Use panel specs first
The calculator estimates from coverage width and a selected fastening pattern. Manufacturer fastening instructions still control the final order.
Roofing Tool
Metal Roofing Screw Calculator
Estimate exposed-fastener metal roof screws from roof dimensions, panel coverage width, screw pattern, overlap screws, and waste allowance. Use it as a material planning baseline before quoting panels, trim, closures, and color-match fasteners.
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Screw Count Estimate
Enter the roof and panel details
This tool follows the same practical input model contractors expect: roof length, roof width, panel coverage, fastening pattern, overlap screws, and waste factor.
Method
How this estimate works
The calculator starts with a screws-per-square baseline for the selected fastening pattern, uses panel coverage width to estimate panel count and optional side-lap screws, then applies the selected waste factor.
Estimating note: this is a planning tool, not an engineered fastening
schedule. Roof complexity, hips, valleys, ridge, rake, eave details, substrate, wind zone,
and manufacturer specs can change the final count.
Screw Guide
Before ordering fasteners
Buy the buffer
Keep a 10% to 15% allowance for dropped fasteners, broken heads, trim adjustments, future repairs, and roof details that were not in the first measurement.
Match the screw to the substrate
Metal-to-wood, metal-to-metal, and lap conditions can need different screw heads, drill points, lengths, and coatings.
Next Step
Need panels, trim, and screws priced together?
Send the calculator result with your color, panel lengths, trim needs, and pickup or delivery details. Call the yard at (215) 688-3986 if the fastening schedule is not clear.