Free solar calculators for homes, institutions, farms & EV owners
Every tool shows its assumptions. Use them, then get a firm quote from a verified installer.
These free tools turn your electricity bill or your system details into plain numbers. The rooftop calculator sizes a system to take your monthly bill near zero and shows subsidy and payback for Kerala or Kanyakumari. The Solar Rules Checker lists the subsidies, metering rules and conditions that apply to your property. The EMI, institution, pump and EV calculators cover financing, churches and schools, farms and electric vehicles. Every tool shows its assumptions, and every result can be sent to us on WhatsApp for a firm quote.
Solar Rules Checker
Pick your system, state and units to see every subsidy, rule and condition that applies.
Check my rules →Rooftop Solar Calculator
System size, subsidy, payback and 25-year savings from your bill.
Open calculator →Solar Loan EMI Calculator
Calculate your solar loan EMI and compare it with your monthly electricity saving.
Open calculator →Institution Solar ROI Calculator
Compare CAPEX vs zero-investment RESCO for institutional solar projects.
Open calculator →Solar Pump Savings Calculator
Estimate diesel savings, subsidy impact and payback for a solar water pump.
Open calculator →Solar + EV Savings Calculator
See petrol vs electric running costs and how much solar your EV needs.
Open calculator →