Solar Roof Area Calculator
Calculate available roof space and solar panel capacity for your roof
About this calculator
The Solar Roof Area Calculator helps homeowners determine how much usable roof space they have for solar panel installation and estimates the maximum solar capacity their roof can accommodate. This tool considers roof dimensions, obstacles like chimneys and vents, roof pitch, and orientation to provide accurate calculations. By knowing your roof's solar potential, you can make informed decisions about solar system sizing, expected energy production, and return on investment before consulting with installers.
How to use
Enter your roof's length and width measurements to calculate total area. Input any obstacles or unusable spaces that need to be subtracted. Select your roof pitch and orientation if prompted. The calculator will determine your available solar installation area and estimate how many panels can fit, along with potential system capacity in kilowatts.
Frequently asked questions
What roof obstacles should I account for?
Include chimneys, vents, skylights, HVAC units, satellite dishes, and any areas with heavy shading. Also consider setbacks required by local building codes.
How accurate are the solar capacity estimates?
Estimates provide a good starting point but actual capacity depends on specific panel sizes, spacing requirements, and local installation codes. Professional assessment is recommended.
Does roof pitch affect solar panel capacity?
Yes, steeper roofs may require more spacing between panel rows to prevent shading, potentially reducing total capacity compared to moderate-pitched roofs.