How do I calculate roofing? Enter your numbers above and the result updates instantly. For example: Roof footprint length: 40 ft · Roof footprint width: 30 ft · Pitch: 6/12 · Waste: 12% → Roofing squares needed: 15.1 squares.
Is this Roofing Calculator free? Yes — completely free with no sign-up or paywall. It runs entirely in your browser and keeps working offline; the numbers you enter never leave your device.
How accurate is it? It uses the standard published formula for roofing. Results are estimates for planning — not financial, tax, medical, engineering, or legal advice.