Solar Calculator
Use this solar cost calculator to find the perfect solar system for your home or business. Enter your monthly electricity bill and get instant results — recommended kW size, total installation cost, government subsidy, and final price after subsidy.
Enter Your Monthly Electricity Bill
Your electricity bill helps the solar power calculator estimate your energy usage.
₹3,000
Basic Details to Calculate Solar Savings
Your location helps us calculate the correct subsidy, improve cost accuracy, and connect you with nearby solar experts.
How This Solar Calculator Works
Three simple steps. No confusion. Just the numbers you need.
Enter Your Electricity Bill
Drag the slider to your average monthly electricity bill. This single number tells the solar power calculator how much energy you use and what system size you need.
Add Your Location
Your state determines the subsidy rate under PM Surya Ghar. Your city and PIN improve the accuracy of cost estimates and help us connect you with verified solar installers nearby.
Get Instant Results
See your ideal kW size, estimated installation cost, government subsidy amount, and final cost range — all in seconds. No email required, no waiting.
How to Choose the Right Solar System Size
Choosing the right size is important. The easiest way is to work backwards from your monthly bill.
If your bill is ₹3,000 and the electricity rate is ₹7.5/unit, you consume around 400 units per month — roughly 13 units per day. In India, a 1 kW solar system generates about 4–5 units per day (based on 4.5 peak sun hours). So a 3 kW solar system is the right fit for this usage.
Solar Saathi's solar panel calculator does this automatically for any bill amount. You can also understand how solar works in simple terms with our solar energy guide.
PM Surya Ghar Subsidy Explained
The government provides a subsidy under PM Surya Ghar Yojana for residential rooftop solar installations. Here's the subsidy structure:
- ₹30,000 per kW for the first 2 kW
- ₹18,000 for the 3rd kW
- ₹9,000 per kW from 3–10 kW
- Maximum subsidy: ₹1,17,000
Important: You pay the full installation cost upfront. The subsidy is credited directly to your bank account within 30–90 days after a DISCOM inspection confirms your installation.
Solar Panel Cost & Roof Area in India (2025)
All-in installation cost runs between ₹55,000–₹70,000 per kW for residential systems. For example, a 3 kW system costs ₹1.65–₹2.1 lakh before subsidy. After the ₹78,000 PM Surya Ghar subsidy, the net cost comes down to roughly ₹87,000–₹1.32 lakh.
For roof space, plan for 100–110 sq ft per kW — so a 3 kW system needs 300–330 sq ft. Make sure the area is shadow-free and ideally south-facing for maximum generation.
Use the solar panel price calculator above for exact pricing based on your bill and state.
Who Should Use This Solar Calculator?
This solar rooftop calculator is built for anyone in India considering a solar installation:
- Homeowners planning their first solar installation
- Business owners comparing system costs
- Property developers evaluating solar for multiple units
- Solar buyers wanting a quick cost estimate before vendor meetings
If you want to reduce your electricity bills, this solar power calculator is the right first step.
Your Solar Installation Journey
Switching to solar is simple when you follow the right steps. Here's your complete journey from calculation to savings.
Run this solar calculator to find your system size
Check your savings with the solar savings calculator
Get free solar consultancy from our experts
Schedule your free site survey
Install your solar panels and start saving
Know your system size? Calculate your returns.
Use the Solar Savings Calculator to see your exact payback period, 10-year and 25-year ROI, and total lifetime profit.