System Size Calculator
Find the right solar system size for your home based on your electricity bill, available roof area, and budget.
Your Details
Limits system size by available space
Caps system cost to your budget
Recommended System
System Size
—
kilowatts
Panel Count
—
panels
Coverage
—
of electricity bill
Gross Cost
—
Net Cost
—
Roof Area Required
—
sq ft
Annual Production
—
kWh / year
Annual Savings
—
Payback Period
—
years
System Constrained
Ready to Go Solar?
Get free, no-obligation quotes from certified solar installers in your area and start saving today.
Enter your electricity bill and optional constraints above, then click "Size My System" to get your recommended solar system size.
Estimates use national averages: $0.15/kWh electricity rate, 5 peak sun hours/day, 85% performance ratio. Actual results vary by location and installation. Note: The federal solar tax credit was eliminated January 1, 2026. State incentives may still be available.
Want an estimate for your actual roof using satellite imagery?
Try our Rooftop Solar Potential Estimator