Solar Panel Calculator – Free Solar Cost & Savings Estimator

Solar Panel Calculator

Estimate your solar system size, cost, savings, and payback time in minutes.

Calculate My Solar Setup

Full Calculator Page

Free · No signup · US assumptions, fully adjustable

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Adjust the values below — results update instantly.

Monthly electricity bill (USD/month)

Electricity rate (USD/kWh)

Average sun hours per day Typical US range: 3.5–6.5 depending on state.

Desired bill offset<br>50% 75% 90% 100%

Panel wattage<br>350 W 400 W 450 W<br>Installed cost per watt (USD/W)

Roof usable area (sq ft) — optional Leave empty if unknown.

Battery option<br>No battery Small backup battery (~$9,000) Whole-home battery (~$18,000)

Apply 30% federal tax credit

Your Solar Estimate

Estimated system size<br>Panels needed<br>Net cost<br>Payback period<br>Yearly production<br>Roof area needed<br>Gross cost<br>Federal tax credit<br>Yearly savings<br>Monthly savings<br>With battery

Total cost including battery:<br>&middot; Payback:

This is an estimate. Actual results depend on roof direction, shading,<br>local incentives, utility rules, and installer pricing.

Why use this calculator?<br>No signup required<br>Get your full estimate instantly — no email, no phone number, no sales calls.

Based on your real bill<br>Uses your electricity bill, roof size, and location assumptions instead of generic averages.

Clear financial picture<br>See estimated system size, net cost after tax credit, and payback period side by side.

What it estimates

One set of inputs, a complete picture of your potential solar project:

✓ System size in kWp<br>✓ Number of panels<br>✓ Yearly energy production<br>✓ Estimated installation cost<br>✓ Estimated yearly savings<br>✓ Payback period<br>✓ Optional battery recommendation

Example result<br>System size8.2 kW<br>Panels needed21 panels<br>Yearly production12,400 kWh<br>Gross cost$22,550<br>Tax credit−$6,765<br>Net cost$15,785<br>Yearly savings$2,108<br>Payback period7.5 years

Estimate only<br>This calculator provides a rough estimate only. Actual solar production, installation cost, incentives, utility savings, and payback period depend on your location, roof orientation, shading, electricity provider, installer pricing, tax eligibility, and local regulations. Always consult a qualified solar installer or tax professional before making a purchase decision.

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