About this calculator
The solar panel roi calculator gives you a fast, realistic estimate using the same math the pros use. It runs entirely in your browser — nothing you enter is sent to a server.
Use the inputs above to match your exact situation. The result updates in real time.
How to use the result
Solar Panel ROI is one piece of the picture. The biggest gains usually come from running the math before committing. Plug in different scenarios to see how sensitive the answer is to each assumption.
What this doesn't include
Every calculator here uses simplifying assumptions. Taxes, fees, and real-world friction can move the answer 10-30%. Use this as a starting point, not a final answer — and always verify with a qualified professional before making real decisions.