Roof size
More usable roof area can allow more panels.
Free address-based roof analysis
Solar Panel Calculator
See how much solar your roof can support
Enter your address to analyze your roof and estimate its solar potential, possible panel capacity, system size, and annual electricity production.
Start your free analysis
Use your address,not a generic guess.
See available solar potential, possible roof capacity, and estimated annual electricity production for your home.
A more useful starting point
How does the solar panel calculator work?
SunMyRoof uses available address and building context to estimate rooftop solar potential instead of relying only on a generic square-footage assumption.
Your early estimate can depend on roof geometry, usable area, orientation, pitch, shade, and location. It is a preliminary planning tool—not a replacement for a site visit or installation design.
The financial side
Want to estimate potential savings too?
Use your roof analysis and average electricity bill to explore potential savings and simple payback.
Roof capacity
How many solar panels can my roof support?
Roof size alone does not determine capacity. Usable area, separate roof sections, obstacles, shade, orientation, panel dimensions, and local building or site conditions all matter.
Learn how many solar panels can fit on your roofUsable roof area
Roof sections and obstacles
Shade and orientation
Panel dimensions
Setbacks and local conditions
Roof layout
Capacity and production
How much electricity could my solar panels produce?
System capacity is commonly expressed in kilowatts (kW). Electricity production is expressed in kilowatt-hours (kWh) over time.
Two roofs with similarly sized systems can produce different annual electricity because of sun exposure, orientation, shading, climate, and roof characteristics. A capacity estimate is useful context, but it does not guarantee a production outcome.
The practical signals
What affects your roof's solar potential?
Roof orientation
Surfaces receiving better sun exposure generally have stronger potential.
Roof pitch
Pitch influences how directly panels receive sunlight.
Shade
Trees, neighbouring buildings, and roof structures can reduce production.
Geographic location
Solar exposure varies by location and climate.
Roof layout
Dormers, skylights, vents, chimneys, setbacks, and separate sections affect usable area.
Preliminary, not final
How accurate is the SunMyRoof solar calculator?
Results are estimates based on available building and solar data plus the assumptions used in the analysis. They are intended for preliminary planning.
Actual installation design may vary. Roof condition needs separate inspection, local permitting and electrical requirements can affect the final system, and an installer should verify measurements and feasibility before installation.
A useful first read
What can you learn from your solar analysis?
Your report can help you understand whether the roof appears worth exploring, approximate panel potential, possible system capacity, estimated electricity production, and potential energy coverage. Financial estimates appear only where regional support is available.
Questions, answered plainly
Solar calculator FAQs
Is the SunMyRoof solar panel calculator free?
Yes. Homeowners can use SunMyRoof to analyze available solar potential without charge or an account.
Do I need to know my roof size?
No. The address-based analysis attempts to use available building and roof information, so you can start without measuring your roof yourself.
How many solar panels do I need for my house?
The right number depends on your electricity consumption, available roof space, solar production, and the amount of energy you want the system to cover. See how many solar panels can fit on your roof for more context on the available roof space.
Does roof direction affect solar panel production?
Yes. Roof orientation affects solar exposure, though multiple roof directions can still be viable. It is considered alongside shade, pitch, layout, and location.
Can a shaded roof still use solar panels?
Potentially. Shade can reduce output, and the practical effect depends on when and where it falls on the roof. A site-specific analysis is needed for a useful first estimate.
Is this a final solar installation quote?
No. SunMyRoof provides preliminary planning estimates, not a contractor quote, final installation design, engineering assessment, or approval decision.