Solar Panel Calculator
Solar Panel Calculator – Size, Cost & Savings For Your House
Enter your monthly electricity bill to instantly see the right solar system size for your home in 🇮🇳 India, plus equipment cost, annual savings, payback period and 25-year net savings.
See your recommended system size, savings and payback in seconds — for 🇮🇳 India.
Tip: each 1 kW needs about 80–100 sq ft of unshaded roof.
How it works
We estimate monthly units from your bill, size the system to cover ~100% of usage, and apply local tariffs & generation factors.
Accurate for India & USA
Toggle the country switch (top right). Tariff, kWh per kW and pricing auto-adjust for IN or US.
Next step
Use the result to download an instant solar quote or compare top tier-1 brands side by side.
How accurate is this solar calculator?
Our calculator uses regional benchmarks: ~120 kWh/kW/month in India and ~130 kWh/kW/month in US sunbelt, with average residential tariffs of ₹8/kWh (India) and $0.16/kWh (USA). Real generation varies ±10% with roof angle, shading and weather.
What size solar do I need for my house?
A 3 kW system suits a ₹2,500–₹3,500 bill in India or a ~$80–$120 bill in the US. A 5 kW system covers ₹5,000 / $150 bills. 10 kW systems cover ₹10,000 / $300+ bills and run AC, EV charging and pool pumps comfortably.