Solar Installation Cost Calculator
Estimate your total installed cost with incentives and cost per watt.
Free cost tool
Solar Installation Cost Calculator
Estimate your total installed cost, net price after incentives, and cost per watt — before you get a single quote.
System size
Location & incentives
Estimates based on national averages. Actual costs vary by region, installer, equipment, and roof complexity. Get 2-3 quotes and compare against this estimate.
How to Use This Solar Cost Calculator
This solar cost calculator estimates your total installation price based on system size, cost per watt, installation type, and available incentives. Unlike basic solar price calculators that give a single number, this tool breaks down every cost component — panels, labor, battery storage, federal tax credit, and state rebates — so you see exactly where your money goes.
Start by entering your system size in kW. If you do not know your system size yet, use our Solar System Calculator to size the system from your appliance list first, then come back here with that number. Adjust the cost per watt slider to match your region — the US average is $2.50-3.25/W in 2026, but this varies by state. The calculator handles the incentive math automatically: enter the federal tax credit percentage (30% through 2032) and any state or local rebate amount.
What This Solar Electric Cost Calculator Includes
The solar electric cost calculator covers the complete installed system price — not just the panels. When you see a cost-per-watt figure, it includes solar panels, inverter, racking and mounting hardware, wiring and electrical components, labor, permitting, design, and interconnection fees. Battery storage is calculated separately because not every system includes it, and the cost varies significantly by battery size.
The installation type selector adjusts for the cost difference between rooftop, ground-mount, and carport installations. Ground-mount systems cost 10-15% more than rooftop due to the racking structure and concrete foundations. Carport installations cost 20-25% more but provide covered parking alongside solar production.
Solar Energy Cost Estimator: What Affects Your Price
Four factors determine what you will pay, and this solar energy cost estimator accounts for all of them. First, system size — larger systems cost less per watt due to economies of scale. Second, location — labor rates, permit costs, and installer competition vary by state. Third, equipment choice — premium panels and inverters cost 10-20% more but often produce more energy per dollar over 25 years. Fourth, incentives — the federal ITC alone reduces your net cost by 30%, and many states add rebates of $500-5,000 on top.
After calculating your installation cost here, run the net cost through our Solar Savings Calculator to see your payback period and 25-year return. The combination of this solar power cost estimator and the savings calculator answers both questions: “What will it cost?” and “What will it save?” If you are comparing quotes from installers, our guide on solar installation costs in 2026 shows average prices by state so you can identify fair pricing.
Frequently Asked Questions
How accurate is this solar cost calculator?
The calculator uses national average cost-per-watt data for 2026 and standard incentive structures. It provides a reliable estimate within 10-15% of actual quotes for most US locations. For the most accurate result, adjust the cost-per-watt slider to match your state’s average — Texas and Florida are $2.20-2.60/W while California and New York are $2.90-3.80/W. Always get 2-3 actual installer quotes to compare against this estimate.
Does this solar system cost calculator include battery storage?
Yes. Select a battery size from the dropdown (5 kWh to 20 kWh) and the cost is added to the total. The federal tax credit applies to the battery when installed with solar, so the calculator reduces the combined cost by 30%. If you do not plan to install a battery, select “No battery” and the estimate covers panels, inverter, and installation only.
What is the average solar panel installation cost in 2026?
The average installed cost in the US is $2.50-3.25 per watt before incentives. For a typical 8 kW system, that is $20,000-26,000 gross. After the 30% federal ITC, the net cost drops to $14,000-18,200. Prices vary significantly by state — use this calculator with your state’s cost-per-watt to get a localized estimate.