Tools

Calculators

Free, no signup, no lead capture. Defaults are documented national averages — see the methodology — and every input is yours to override.

The flagship. Monthly bill in — system size, upfront cost, annual savings, and payback period out. Every assumption editable.

The federal homeowner credit ended after 2025. See what applies to your install year, and where state incentives fit.

Year-by-year break-even with panel degradation and utility-rate escalation modeled, plus 25-year lifetime return.

25-year totals and ownership tradeoffs side by side — including the post-2025 lease incentive asymmetry.

What an owned system adds at resale, based on Zillow and Lawrence Berkeley National Laboratory research.