Terawatt Solar's free solar calculator gives Ontario homeowners and businesses a real, itemized price estimate, not a generic range, built from your postal code, roof type, and actual electricity usage.
Pricing a solar installation in Ontario used to mean waiting on a sales call just to get a ballpark number. This solar calculator Ontario Canada homeowners can use right now skips that step: enter your postal code, pick your roof type, and tell us your electricity usage (annual, monthly, or a system size you already have in mind), and the calculator builds a real price breakdown on the spot, covering panels, inverter, racking, permitting-related fees, and HST, plus a 30-year savings projection comparing net metering against load displacement with battery backup.
This tool serves the full Terawatt Solar service area across the Greater Toronto Area and southwestern Ontario, including Toronto neighborhoods from the Beaches to Etobicoke, Markham communities like Unionville, Cornell, and Berczy Village, Mississauga areas including Streetsville, Port Credit, and Meadowvale, Brampton's Heart Lake and Springdale neighborhoods, Vaughan including Woodbridge, Maple, and Thornhill, Oakville's Glen Abbey and Bronte neighborhoods, Burlington, Hamilton, and Kitchener-Waterloo. Whichever GTA neighborhood you're in, the calculator pulls the right utility fees and municipal permit costs for your area automatically once you select your city.
Start by entering your postal code so the calculator can confirm you're in our Ontario service area and apply the right utility and municipal fee data for your city. Choose your roof type (sloped, ground mount, or flat), then pick how you'd like to describe your electricity usage: your annual kWh from a recent hydro bill, a full twelve months of monthly usage for a more precise seasonal estimate, or a system size in kW if you already know roughly what you want installed.
From there you can generate a free generalized estimate instantly, or opt into a paid custom solar analysis for a more detailed, site-specific design. The free estimate compares two real paths side by side: net metering, which sizes your system to offset close to 100% of your annual usage and banks credit with your utility, and load displacement with battery backup, a smaller system paired with battery storage that can qualify for Ontario's Home Renovation Savings Program grant. Every estimate includes equipment details (Canadian Solar panels, SolarEdge or Growatt inverters depending on the path, and battery sizing where applicable), a full cost breakdown, and a printable report you can save or share.
Most "solar calculators" online just multiply a national average price per watt by a rough system size guess. This Ontario solar calculator uses Terawatt Solar's actual current equipment pricing, real panel and inverter costs, and the specific utility and permitting fees tied to your city, so the number you see is close to what a real proposal would show, not a marketing placeholder. We still recommend a free in-person or virtual assessment before signing anything, since roof shading, orientation, and panel layout can shift the final design, but this calculator gets you a credible starting point in under two minutes.
