System Size Calculator

Find the right solar system size for your home based on your electricity bill, available roof area, and budget.

Your Details

Monthly Electricity Bill ($) *

Available Roof Area (sq ft) optional

Limits system size by available space

Budget ($) optional

Caps system cost to your budget

Panel Type

Panel pricing: Compliant (AVL/DomCon) panels run $0.60–$0.80/W. Non-compliant panels (Mission, JA, Canadian) start at $0.37/W. The 30% residential federal tax credit (Section 25D) expired December 31, 2025 — an owned residential system installed in 2026 receives $0 in federal credit regardless of panel choice. Non-compliant panels additionally disqualify the Section 48E credit (lease/PPA/commercial) and IRA bonus credits.See current ITC status →

Enter your electricity bill and optional constraints above, then click "Size My System" to get your recommended solar system size.

Estimates use national averages: $0.1844/kWh electricity rate (EIA April 2026 US residential average), 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

See how your state compares nationally. Installed cost-per-watt and local incentives swing payback by up to 2x across the U.S.

Open the 2026 Solar Guide →