About Solar Size Calculator

solarsizecalculator.com is the most comprehensive free solar calculator platform on the web. With 130+ calculators covering everything from residential panel sizing to RV solar systems to financial analysis, we help you make informed decisions about solar energy.

Our Mission

Solar energy has a complexity problem. Between panel wattage, battery amp-hours, charge controller ratings, wire gauges, and financial incentives, the average homeowner faces a wall of technical jargon. We built solarsizecalculator.com to cut through that complexity.

Every calculator starts with sensible defaults and shows results instantly. Technical terms have tooltips. Examples use real-world scenarios. The math is transparent — formulas are shown on every page.

How Our Calculators Work

• 100% client-side — all calculations run in your browser. Nothing is sent to our servers.
• No signup required — no accounts, no email gates, no paywalls.
• No cookies — we don't track you.
• Shareable — every calculator encodes your inputs in the URL. Share your exact setup with anyone.
• Mobile-first — designed for phones because that's where most people research solar.

Accuracy & Limitations

Our calculators use industry-standard formulas and up-to-date data. However, they provide estimates — not engineering specifications. Real-world solar performance depends on countless variables that no online calculator can fully account for. Always consult a certified solar installer for final system design.

Contact

Questions, corrections, or suggestions? We'd love to hear from you. Email us at hello@solarsizecalculator.com.