Solar Size Calc is a free solar calculator tool built for homeowners, businesses, farmers, and off-grid users worldwide. We help you find exactly how many solar panels, what inverter size, and how much battery storage you need — without any technical knowledge or expensive consultation.
We are a team of energy enthusiasts who built this free solar calculator tool to make solar planning accessible to everyone. Our solar size calc platform is used by thousands of users across 100+ countries to plan grid-tied and off-grid systems.
Our mission is simple — to make solar planning accessible to every homeowner and business owner worldwide. Solar Size Calc provides fast, accurate, and unbiased calculators that demystify renewable energy decisions, completely free of charge.
Built on industry-standard formulas and refined with real installer feedback.
Use every tool instantly — no email, no account, no paywall.
Trusted by users across 100+ countries to plan grid-tied and off-grid systems.
Yes — 100% free, forever. Our free solar calculator tool has no hidden charges, no subscription, and no paywall. We earn through ads to keep the service free for everyone around the world.
Very accurate for planning purposes. Our solar size calc uses industry-standard formulas, real-world sun hour data from global databases, and up-to-date panel efficiency ratings. Results are estimates — always consult a certified solar installer before making a final purchase.
No signup required. You can use our free solar calculator tool instantly — no email, no account, no personal information needed. Just open the tool and start calculating.
Absolutely. Solar Size Calc works for residential homes, commercial buildings, farms, factories, and off-grid installations of any size. Simply enter your monthly electricity usage and our solar size calc will give you instant results.
On-Grid systems connect to the electricity grid — cheapest option, no battery needed, best for areas with reliable power supply.
Hybrid systems combine grid connection with battery backup — ideal for areas with load-shedding like Pakistan and India.
Off-Grid systems work completely independently — best for remote areas with no grid access. Our solar size calc handles all three system types accurately.