Roofing Takeoff Calculator
Complete roofing material takeoff from roof dimensions and pitch. Get tiles, battens, membrane, felt, fixings, and flashing quantities in one calculation. Free, no signup.
Roof Area Calculator
Calculate actual roof surface area from plan dimensions and pitch
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Roofing takeoff — did you know?
What a full takeoff includes
Tiles (by type and count), underlay/membrane (m² + rolls), battens (linear metres), nails/screws (by type), ridge/hip tiles, valley gutter, flashing (apron/step/valley), verge trim, ventilation. A professional takeoff leaves nothing to guess.
Batten calculation
Batten length = roof_area ÷ batten_gauge. At 35° pitch with 345mm batten gauge: 100 m² ÷ 0.345 = 290 linear metres of batten per slope. Add 10% for cuts. 25mm × 50mm treated timber is UK standard.
Membrane/underlay calculation
Membrane rolls: typically 1.5m × 50m = 75 m² per roll. Coverage with 150mm horizontal laps: ~60 m² effective. 100 m² roof: 100 ÷ 60 = 1.67 → 2 rolls. Add 1 roll for complex roofs. Use breathable membrane for cold roofs.
Fixings and accessories
Nails: tile nails (~2 per tile), batten nails (~1 per batten intersection). Screws: for metal roofing, ~8/m². Dry ridge kit: 1 kit per 10m ridge. Ventilation: 1 tile vent per 5-10 m² of roof space (check Part F).
Formulas used
Tiles
tiles = area × tiles_per_m² × (1 + waste%)
Battens (linear m)
battens = area ÷ batten_gauge × 1.1
Membrane (rolls)
rolls = ceil(area ÷ 60)
Ridge tiles
ridge = ridge_length ÷ 0.4
Frequently asked questions
What is a roofing takeoff?
A complete list of all materials needed: tiles, battens, membrane, nails, flashing, ridge, vents. Everything required to build the roof, quantified from the roof dimensions and pitch.
How do I calculate battens for a roof?
roof_area ÷ batten_gauge × 1.1 (10% waste). At 35° with 345mm gauge: 100 m² ÷ 0.345 × 1.1 = 319 linear metres of batten.
How many rolls of membrane do I need?
Roll coverage: ~60 m² effective (75 m² roll minus 150mm laps). 100 m² roof: 2 rolls. Add 1 for complex roofs.
Best free roofing takeoff calculator?
One that covers tiles, battens, membrane, fixings, and flashing in one pass. This tool does all, free.