Solar Panel Calculator: How Many Panels Fit on Your
Use this free interactive solar panel calculator to find out how many solar panels fit on your roof. Draw your roof outline on the satellite map, choose
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Project Sunroof
Search for a city, state, or zip code to see solar potential and impact across entire geographic areas. We currently have solar data for portions of 50 states and Washington DC.
How Many Solar Panels Do I Need? 2025 Calculator
How many solar panels do I need? Use our 2025 calculator to size your system by home size, kWh usage, and location. Get panel count, roof