Solar Panel Calculator
Calculate solar panel system size, number of panels needed, installation costs, and potential savings.
Your Energy Usage
Recommended System
6.88 kW
18 panels
105% of your usage covered
System Details
Panels Needed18 x 400W
Roof Space Required315 sq ft
Fits On Your Roof✓ Yes
Monthly Production929 kWh
Cost & Savings
Estimated System Cost$18,923
Federal Tax Credit (30%)-$5,677
Net Cost$13,246
Annual Savings$1,356/year
Payback Period9.8 years
25-Year Net Savings$20,655
Environmental Impact
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5.2 tons
CO₂ offset per year
Equivalent to planting ~83 trees
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Editorial Note
MyCalcBuddy Editorial Team
This page is maintained as an educational calculator reference.
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Formula Source: Standard Mathematical References
by Various
🔄Last reviewed: May 2026
✓Formula checks are based on standard references and internal QA review.