Solar Panel Calculator
Calculate solar panel ROI, payback period, and lifetime savings. Estimate system size needed based on electricity usage and location.
US Federal Solar Tax Credit: 30% (2024–2032)
Payback Period
10.8 years
Net System Cost
$14,000.00
Annual Savings
$1,300.00
25-Year Savings
$18,500.00
25-Year ROI
132.1%
CO₂ Offset (25yr)
113.3 tons
You Save Incentive
$6,000.00
How to Use the Solar Panel Calculator
Enter your values above for an instant result. This tool uses verified formulas and is optimised for users in USA, Canada, UK, Australia. All calculations happen in your browser — your data is never sent to our servers.
Frequently Asked Questions
What is the payback period for solar panels?
In the USA, the average solar payback period is 6–12 years. After that, electricity is essentially free for the remaining 15–20+ year panel life.
How many solar panels do I need for a 2,000 sq ft home?
An average 2,000 sq ft US home uses ~10,000 kWh/year and needs 20–25 solar panels (400W each) to offset 100% of usage.