Roof Area from Pitch Calculator
Calculate true sloped roof area from the plan footprint and pitch.
Result
- Plan footprint
- 80 m²
- Pitch multiplier
- × 1.12
- True sloped area
- 89.44 m²
- Add 10% waste
- 98.39 m²
Roofing calculators
Shingles, underlay, gutters and roof area by pitch.
Shingle Bundle Calculator
How many bundles of asphalt shingles you need for a given roof area.
Result
- Area with waste
- 132 m²
- Bundles needed
- 43
- Squares (100 ft²)
- 14.21
Gutter & Downpipe Calculator
Estimate gutter run, downpipes and brackets needed for a house.
Result
- Gutter required
- 36 m
- Downpipes
- 3
- Brackets
- 45
Roof Tile & Replacement Materials Calculator
Count roof tiles, battens, membrane, ridge tiles and fixings for a full re-roof or a partial repair, with waste and an optional cost estimate.
Result
- True roof slope area
- 97.66 m²
- Area being replaced
- 97.66 m²
- Tiles needed (incl. waste)
- 1,075
- Tiling battens
- 298 m
- Breathable membrane
- 2 roll(s) of 75 m²
- Ridge tiles (≈450 mm)
- 23
- Tile nails / clips
- 1,129
Slope area = plan area ÷ cos(pitch); tiles = area × tiles per m² × (1 + waste)