Free Sizing Calculator

How Much Solar Do I Need?

Answer 4 quick questions. Get your recommended system size, panel count, and cost estimate — instantly.

Step 1 of 4 — Your Energy Usage

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Energy Location Roof Results

Your Energy Usage

How much electricity does your home use?

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Monthly Bill ($) Monthly kWh

What's your average monthly electric bill?

Your Solar System Recommendation

Based on your energy usage, location, and roof details

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Recommended System Size

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Solar Panels

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Bill Covered

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Est. Cost

Your Panels on the Roof

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System Size

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Sun Hours

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Avg. peak sun hours/day in your area

Estimated Cost

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Roof Space Used

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Estimated Bill Coverage

Your monthly usage —

Solar production —

Get a Personalized Quote

Connect with certified solar installers in your area for exact pricing based on your roof and energy needs — free, no obligation.

No spam, no pushy sales calls. Just accurate quotes from vetted installers.

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How We Calculate Your Solar System Size

Our sizing calculator uses your monthly electricity consumption (from your bill or kWh usage), local peak sun hours based on your zip code, your roof's available square footage, and roof orientation to recommend the right system size. We estimate the number of 400-watt panels needed, check whether they fit your roof, and calculate the approximate cost at the national average of $3.00 per watt installed. The 30% federal Investment Tax Credit (ITC) under the Inflation Reduction Act is applied to show your net cost. These are estimates — actual system design depends on your specific roof, shading, and installer pricing.