# Solar Panel Output Calculator for Your Roof | SunCast

Estimate monthly and yearly solar panel output from your roof area, direction, pitch and shade. Compare roof sections with this free solar calculator.

Canonical HTML: https://suncastapp.com/tools/solar-potential
Last updated: 2026-09-17

## Direct Answer

The SunCast roof solar potential calculator estimates how much electricity solar panels could produce from one or more roof sections. Enter the usable area, direction, pitch and approximate shade for each section; the calculator combines the results using PVGIS historical solar-radiation data.

## Key Facts
- Each roof plane is calculated separately, so split, L-shaped and multi-direction roofs can be represented without drawing their full geometry.
- The estimate uses a 450 W panel occupying about 2 square metres and includes 14% standard system losses.
- Local trees, chimneys and nearby buildings are not detected automatically; shade is entered as an approximate range.

## Common Uses
- Get a preliminary production estimate where detailed rooftop imagery is unavailable.
- Compare south-, east- and west-facing sections of the same roof.
- See how roof pitch and approximate shade affect monthly and annual generation.
- Prepare for a professional solar survey with a transparent first estimate.