Roofing Calculator
Calculate how many roofing squares you need and the estimated material cost.
Enter your numbers and select Calculate to see results.
About This Calculator
Roofing material is typically sold by the 'square' (100 square feet). This calculator converts your roof's total area into roofing squares, applies a waste allowance for cuts and overlaps, and estimates the material cost.
How This Is Calculated
Squares = (Roof Area ÷ 100) × (1 + Waste %)
- Square
- — 100 square feet — the standard roofing material unit
A 2,000 sq ft roof with 10% waste needs 22 roofing squares.
Assumptions
- Roof area should ideally reflect the actual sloped surface area, which is larger than the home's footprint for pitched roofs — a professional measurement is most accurate.
- Cost per square varies significantly by material type (asphalt shingle vs. metal vs. tile) and region.
Frequently Asked Questions
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Last updated January 15, 2026. Results are estimates for informational purposes only — read our disclaimer.