Roofing Calculator
Calculate true roof area and material required including pitch multiplier and waste.
Estimate only — not a substitute for a licensed tradesperson, a certified engineer, or sign-off from your local building surveyor. Verify against current standards and site conditions before ordering materials or starting work.
Result
- True roof area
- 162.36m²
- Material to order (incl. waste)
- 178.59m²
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What this is based on
Geometry and quantity take-off - true roof area from plan area, pitch multiplier and a waste allowance. No code governs this arithmetic. Minimum pitch for a given cladding is set by the cladding manufacturer and AS 1562, and is not checked here.
We cite the clause and link to the publisher so you can read the source yourself. We do not reproduce the text or tables of the NCC or of any Australian Standard.