Rooftop Solar Space Calculator

Find out how much solar capacity your roof can hold.

Usable roof length (m)

Usable roof width (m)

Usable area after setbacks/shading (%)

Panel wattage (W)

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Estimated system capacity

Total roof area—

Usable area—

Estimated panel count—

Assumes ~2.1 m² per panel including spacing. Actual fit depends on roof shape, obstructions, and orientation — a site survey gives an exact layout.