Roof Tile & Sheet Calculator
Free Australian roof tile and sheet calculator. Calculate Colorbond corrugated sheets, Klip-Lok standing seam, concrete tiles, terracotta tiles and shingles in pieces and pallets per m².
Roof Tile / Sheet Calculator
Estimate tiles, sheeting or shingles needed for your roof — pieces, pallets/sheets, ridge cap and starter course.
How this Australian roof tile and sheet calculator works
Enter the eave-line length and width, the pitch in degrees (most AU homes are 22.5°–30° for tile, 5°–10° for low-slope sheet, 25°–35° for skillion), the eaves overhang, and the waste percentage. Pick the material — Colorbond corrugated, Klip-Lok standing seam, concrete tile, terracotta tile, or architectural asphalt shingle — and the calculator returns the surface area in m², the piece count, the pallet/sheet count, the starter course, the ridge cap pieces, and a material-only cost in AUD.
Pitch is treated in degrees by default to match BCA/NCC documentation; switch to X/12 if you have an imported plan from the US.
The math, derived from first principles
slope factor = 1 / cos(angle)
roof area = (length + 2×overhang) × (width + 2×overhang) × slope factor
pieces = roof area × density × (1 + waste %)A 12 × 9 m brick veneer house at 22.5° pitch with 0.45 m eaves overhang has a surface area of roughly 107 m². At 10/m² for Boral concrete tile that is 1,177 tiles + 10% = 1,295 tiles, or 6 pallets at 240 tiles per pallet. In Lysaght Custom Orb at 0.42 BMT, the same surface area is roughly 47 sheets at 3.0 m sheet length × 0.762 m cover.
Tile and sheet density (AU, 2026)
Densities verified against Boral, Monier, Wienerberger, Lysaght, Stratco and BlueScope current technical data:
| Profile | Pieces / m² (or m² / sheet) | Per pallet / unit | Typical price (A$/m²) |
|---|---|---|---|
| Concrete tile (Macquarie / Madison) | 10 | 240 | A$60 |
| Terracotta tile (Marseille) | 10 | 240 | A$95 |
| Lysaght Custom Orb 0.42 BMT | 0.5 | sheet | A$65 |
| Klip-Lok 406 / 700 standing seam | 0.5 | sheet | A$95 |
| Architectural asphalt shingle (GAF imported) | 6.9 | 21 (bundle) | A$85 |
| Stone-coated metal tile (Decra) | 3.4 | 21 (box) | A$110 |
Prices are 2026 builder-bag, ex-GST, ex-delivery. hipages and Service Seeking quote installed rates of A$60–110 per m² for concrete tile, A$80–130 per m² for Colorbond Custom Orb, and A$130–180 per m² for terracotta or Klip-Lok premium standing seam.
Common mistakes
Cyclonic zones need a different fixing schedule. N4, C1, C2, C3 and C4 wind regions per AS 1170.2 require every tile clipped, not every second tile. The calculator returns piece count regardless — but order extra clips and screws for cyclonic specifications. AS 3959 BAL ratings (BAL 12.5 to FZ Flame Zone) also dictate flashing and underlay choice — not the tile count.
Underestimating skillion-roof sheet length. A skillion or “shed” roof has the entire run at slope, not half — the rafter is the full eave-to-ridge length. The calculator handles this when you select the skillion shape.
Forgetting the verge tile-and-a-half. On half-bond concrete tile every other course needs a tile-and-a-half at the verge. That is built into the 10/m² density already, but order verge tile-and-a-halfs separately if buying loose.
Wrong sheet length spec. Lysaght delivers Custom Orb to your exact rafter length cut on a saw bench at the depot, plus 100 mm for the eave drip. Order 1 piece per gable face at the actual rafter length, not the rounded square-metre figure.
Code references
- BCA / NCC 2022 Volume 2 — Part 7.2 roof cladding and Part 7.3 weatherproofing, plus 3.5 wind classification.
- AS 1562.1 — Design and installation of metal roof cladding.
- AS 2050 — Installation of roof tiles (the AU equivalent of BS 5534).
- AS 1170.2 — Wind action; Region A through D and the cyclonic regions.
- AS 3959 — Construction of buildings in bushfire-prone areas (BAL 12.5–FZ).
- NCC Volume 2 Part 3.7 — Fire safety; roof flashings on BAL-FZ require non-combustible only.
Industry references: Master Builders Australia, Australian Roofing Contractors, Lysaght Roofing & Walling Manual, BlueScope Steel technical data sheets.
How this calculator differs
The metal roof calculator covers metal sheet systems only — panel type, gauge, span. The calculate-roofing material takeoff covers a full reroof bill of materials. This tile-and-sheet calculator sits in between: actual surface area plus just the cladding line items for any of five common AU materials.
Putting it together
Run the calculator, write down the piece count, pallet count, ridge cap pieces and material cost. For a complete budget add the roof cost calculator, and for shape comparisons before you commit, the roof area calculator lets you swap gable vs hip vs skillion on the same footprint.
A typical 110 m² Australian home reroof in Colorbond Custom Orb runs A$8,500–A$12,000 in materials and A$13,000–A$18,000 installed. In concrete tile the same job is roughly A$6,500–A$10,000 in materials and A$11,500–A$15,000 installed. Get the takeoff right at the merchant order stage and the rest of the project schedules cleanly.