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Roofing Calculator
Calculate sloped roof area from its horizontal footprint and pitch angle, plus material allowance and roofing cost.
- Material area including waste
- 127.017059 m²
- Sloped area
- 115.470054 m²
- Cost
- 2,540.34
How the calculation works
Sloped area = horizontal projected area/cos(pitch). Material area = sloped area × (1 + waste/100). Enter the pitch in degrees.
Inputs
- Horizontal footprint, m²
- Pitch angle, °
- Waste, %
- Price per m²
Calculation details
A 100 m² horizontal footprint at 30° has about 115.47 m² of sloped surface. Include overhangs in the footprint when they will be covered.
The formula assumes a uniform pitch for the included slopes. Calculate different pitches separately. Obtain effective sheet coverage, allowing for overlaps, from the manufacturer.
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Updated: 2026-10-02