Roof Tile Calculator
Calculate roof tile quantities from roof area and pitch. Concrete tiles, clay tiles, and slate — with waste allowance and batten spacing. Free, no signup.
Roof Area Calculator
Calculate actual roof surface area from plan dimensions and pitch
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Roof tiles — did you know?
Tiles per m² by type
Concrete interlocking: 9-12/m². Clay pantile: 10-15/m². Plain tile: 60/m². Slate (500×250mm): 20/m² at 75mm headlap. Always check manufacturer specs.
Headlap and batten gauge
Headlap (how much each tile overlaps the one below) determines batten spacing. Concrete interlocking at 35°: 100mm headlap, 345mm batten gauge. Plain tiles: 65mm headlap, 100mm gauge.
Minimum pitch for tiles
Concrete interlocking: 17.5° minimum (15° with special designs). Clay pantile: 22.5°. Plain tiles: 35°. Slate: 20°+ (30°+ for small formats). Below minimums, water tracks back under tiles.
Ridge, hip, and valley tiles
Ridge tiles: 1 per 400mm of ridge length. Hip tiles: 1 per 400mm of hip length. Valley: cut tiles at 45°, add 15% waste to valley rows. Eaves: 1 row of eaves tiles (half-width) at bottom edge.
Formulas used
Tiles needed
tiles = area × tiles_per_m² × (1 + waste%)
Batten length
battens = area ÷ batten_gauge × batten_width_factor
Roof area from plan
area = plan_area × (1 ÷ cos(pitch°))
Ridge tiles
ridge = ridge_length ÷ 0.4
Frequently asked questions
How many roof tiles do I need?
area × tiles_per_m² × (1 + waste%). 122 m² at 10 tiles/m² and 10% waste: 122 × 10 × 1.10 = 1,342 tiles.
How many concrete tiles per m²?
Concrete interlocking: 9-12/m². Clay pantile: 10-15/m². Plain tile: 60/m². Check manufacturer specs for exact coverage.
What batten spacing for roof tiles?
Depends on tile type and headlap. Concrete at 35°: 345mm gauge. Plain tiles: 100mm gauge. Always follow manufacturer batten gauge tables.
Best free roof tile calculator?
One that handles tile counts, batten spacing, and ridge/hip extras. This tool does all, free.