Solar calculator

Estimate your solar savings, with nothing hidden

Every assumption is on the screen and editable. Change your bill, shade, price per watt or local incentives and the results update instantly.

Your home

State Average monthly electric bill$ Roof shade How much of your use to cover 100%

Price and incentives

Installed price per watt $3.00 State, utility or local rebates ($)$ Yearly electricity price increase 3.0%

Assumptions we use

Electricity rate: your state's average (shown in results).
Production: state peak sun hours × 365 × 80% system efficiency × shade factor.
Panels: 430 W each. Output declines 0.5% per year.
Power you make, up to what you use, is valued at your full rate. Extra power sent to the grid is valued at half your rate.
No federal tax credit for homeowner-owned systems installed in 2026.

Your estimate

Recommended system-

Net cost-

First-year savings-

Payback period-

Estimated 25-year net savings-

Cumulative savings vs. cost

Cumulative savings Net system cost

Your rate-

Yearly use-

Yearly production-

CO₂ avoided / year-

Turn this estimate into real quotes

Installers use satellite roof data and your actual utility plan to give exact prices.

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Calculator questions

Why doesn't the calculator include the 30% federal tax credit?

The federal residential clean energy credit ended for systems installed after December 31, 2025. If you lease or use a PPA, the company that owns the system may still use business credits, which can lower your monthly price.

What is a good price per watt?

Most US homeowners see quotes between $2.50 and $3.50 per watt before incentives. Prices are often lower in competitive markets and higher for complex roofs or premium equipment.

Should I cover more than 100% of my use?

Only if you expect to use more electricity soon, for example with an EV or heat pump, and your utility pays fairly for exported power.

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