About the Roof Solar Estimator
Your roof area sets the ceiling on how much solar you can install.
This tool estimates panel count, system size and output from your available space.
How this calculator works
We divide your usable roof area by the footprint of a modern panel, then estimate kW and annual production.
Why it matters
- Know your roof’s solar potential
- Plan around obstructions
- Match ambition to available space
- Feed results into other calculators
Frequently asked questions
A typical panel occupies about 1.9 m² (20 sq ft).
Equator-facing roofs (south in the northern hemisphere) capture the most sun.