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Solar Panel Calculator

Result
—panels
◆ LIVE 3D PREVIEW
System kW
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Est. Savings
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CalcBuild › Solar Panel Calculator

How to Calculate Solar Panel

Use this free solar panel calculator to get instant, accurate results for your construction project. Simply enter your measurements above and the calculator will automatically compute the result using industry-standard formulas.

Pro Tip: Always add 10-15% extra material to account for waste, cuts, and job-site conditions. This is standard practice recommended by experienced contractors.

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💡 Pro Tips — Solar Panel

❓ Frequently Asked Questions

+How many panels do I need?
Average home uses 900 kWh/month. At 5 peak sun hours and 400W panels: about 15-20 panels.
+How much roof space per panel?
Standard panel is about 17.5 sq ft (65" × 39"). 20 panels need about 350 sq ft of suitable roof area.
+What direction should panels face?
South-facing is ideal in the Northern Hemisphere. East/west reduces output by 10-15%. North-facing is not recommended.
+How long is the payback period?
Typically 6-10 years depending on electricity rates, incentives, and sun exposure. Systems last 25-30+ years.
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