Roof area calculator
Calculate the sloped roof area from the covered footprint and the roof pitch.
Roof area (m²)
115.5
- Extra area vs. footprint (m²)
- 15.5
01
Via the cosine
The roof area is the footprint divided by the cosine of the pitch.
02
Why more area
The steeper the roof, the larger the actual area compared with the footprint.
03
For materials
The sloped area is the basis for tile, insulation and sealing quantities.
Geometric approximation, no warranty; excludes overhangs, dormers and waste — a pure footprint projection.
From measurement to finished quote
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