Roofing calculator

Calculate shingle bundles, metal panels, and fastener counts

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The Roofing Calculator helps contractors and homeowners estimate roofing material quantities for different roof types and materials. Calculate bundles, panels, fasteners, and material costs for shingles, metal, tile, and other roofing systems.

Accurate roofing estimates prevent material shortages and cost overruns. The calculator accounts for roof pitch, waste factors, and material-specific coverage to provide precise quantity estimates.

Enter roof area, pitch, and material type to calculate required quantities. The tool supports multiple roofing materials including asphalt shingles, metal panels, tile, slate, and membrane roofing, with automatic waste factor calculations based on roof complexity.

Features

Everything you need

Multiple roofing material support
Shingle bundle calculations
Metal panel quantity estimates
Fastener count calculations
Roof pitch considerations
Waste factor adjustments
Material cost estimation

How it works

Simple workflow

1
Enter roof area and pitch
2
Select roofing material type
3
Review calculated material quantities
4
See fastener requirements
5
Estimate total material costs

Use cases

Built for real-world scenarios

Material estimation

Estimate roofing material quantities for project budgeting and ordering.

Cost planning

Calculate roofing costs for different material options and compare alternatives.

Contractor bidding

Prepare accurate material estimates for roofing project bids.

Homeowner planning

Estimate material needs and costs for residential roofing projects.

FAQ

Frequently asked questions

One square (100 sq ft) requires 3 bundles of standard 3-tab shingles or 3-4 bundles of architectural shingles. Add 10-15% waste factor. For 1,500 sq ft roof: 15 squares × 3 bundles = 45 bundles + 15% = ~52 bundles.

Roof pitch is rise over run (e.g., 4:12 means 4 inches rise per 12 inches run). Higher pitch increases actual roof area. Area = Horizontal Area ÷ cos(pitch angle).

Waste factors: Simple roofs 10%, Moderate complexity 12-15%, Complex (multiple valleys, hips) 15-20%, Very complex 20-25%. Waste accounts for cutting, overlaps, and mistakes.

Asphalt shingles, metal panels (standing seam, corrugated), tile (clay, concrete), slate, membrane (built-up, EPDM), roll roofing, and wood shingles. Each has different coverage and installation requirements.

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We're always looking to improve our calculators. If you have ideas for new features, improvements, or found something that could work better, we'd love to hear from you.

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