Roofing Material Calculator
Calculate exactly how much roofing material you need for your project. Determine shingles, underlayment, flashing, nails, and other materials based on your roof specifications and dimensions.
Step 1: Roof Specifications
Understanding Roof Pitch
Roof pitch is expressed as the vertical rise per 12 inches of horizontal run. A 4/12 pitch means the roof rises 4 inches for every 12 inches of horizontal distance.
Step 2: Material Parameters
About Waste Factor
The waste factor accounts for cutting, trimming, and material loss during installation. More complex roofs with valleys, hips, and dormers require a higher waste factor (15-25%). Simple roofs typically need 5-10% waste.
Material Calculation Results
Total Material Needed
Roofing Material Comparison
| Material Type | Cost per Square | Lifespan | Weight (lb/sq ft) | Maintenance |
|---|
Material Cost Breakdown
Material Calculation Formula
Squares = (Roof Area × Pitch Factor) / 100
Bundles = Squares × Bundles per Square × (1 + Waste Factor)
To calculate materials: First account for roof pitch using the pitch factor, then calculate the number of roofing squares (100 sq ft each). Multiply by bundles per square and add waste factor for total bundles needed.
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