Shingle Square Calculator
Calculate how many shingle squares you need for your roofing project. Estimate materials based on roof dimensions, shingle type, and waste factor for accurate purchasing.
Step 1: Roof Specifications
Understanding Roof Measurements
Measure the length and width of each roof plane. For complex roofs, calculate each section separately and add them together. Don’t forget to account for roof pitch in your calculations.
Step 2: Shingle & Waste Factor
About Shingle Squares
A roofing square equals 100 square feet. Most shingle bundles cover about 33.3 square feet, so you typically need 3 bundles per square. Always add a waste factor (5-20%) for cuts, mistakes, and future repairs.
Shingle Calculation Results
Total Shingle Squares Needed
Shingle Type Comparison
| Shingle Type | Coverage per Bundle | Bundles per Square | Lifespan (Years) |
|---|
Materials Cost Breakdown
Shingle Calculation Formula
Squares = (Roof Area × Pitch Factor ÷ 100) × (1 + Waste Factor)
Roof area is length × width. Pitch factor adjusts for roof slope (1.0 for flat, up to 1.5 for steep). Waste factor adds extra material for cuts and mistakes.
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