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Solar Panel Sizing Calculator

Calculate exactly how many solar panels you need for your home based on your monthly energy usage, location, and roof specifications.

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Are all calculators completely free to use?

Yes! All 1,628+ calculators are 100% free to use. We also offer a Pro plan with advanced features like PDF exports, saved history, and detailed graphs for power users.

How accurate are the electrical calculations?

Our calculators use industry-standard formulas from NEC (National Electrical Code), IEEE standards, and engineering textbooks. Results are accurate to 4 decimal places and verified by licensed engineers.

Can I use these calculators on my mobile phone?

Absolutely! All calculators are fully responsive and work perfectly on iOS, Android, and any modern mobile browser. You can also add our site to your home screen for quick access.

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