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Roofing Calculator
Plan area × pitch factor + waste.
Open interactive calculatorHow to use
Rise/run (e.g. 6/12). Materials from area and pitch.
Formula
factor = hypot(1, rise/run); area = plan × factor × (1+waste)
FAQ
Is this Roofing calculator accurate?
The formula and assumptions are shown on the page, and the engine is covered by audit tests. Results are for reference — not financial or medical advice.
Do I need an account?
No. Calculations run in your browser. Recents can stay on this device.
What inputs do I need?
Rise/run (e.g. 6/12). Materials from area and pitch.
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