Solar ROI Calculator 💰

How to Use the Solar ROI Calculator

Enter your total system cost, federal tax credit percentage (default 30%), and any state or local incentives. The calculator subtracts these from the gross cost to find your net investment.

Enter your current monthly electricity bill and the electricity rate per kWh. The calculator uses your annual bill as Year 1 savings, then compounds at the annual rate increase to project 25-year savings.

Payback period is the number of years until cumulative savings equal your net system cost. ROI is calculated as (25-year savings − net cost) / net cost × 100%. A typical residential solar system pays back in 6–10 years.