How Many Solar Panels Fit on My Roof?
Enter any address and get the answer in 10 seconds — exact panel count, system size in kW, and lifetime savings, computed from satellite roof data. Free calculator, no phone calls, no sales pitch.
Solar Panel Calculator
Enter any address – see how many panels fit
See your full solar savings breakdown
Enter your email to reveal your payback period, system cost before incentives, and lifetime savings on the next screen — right now.
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How it works
Enter an Address
Type any US property address into the form above.
We Analyze Your Roof
Our system pulls satellite roof data from Google Solar and models how much sun your roof gets.
Get Your Estimate
Instantly see how many panels fit, your system size, annual savings, and payback period.
How many solar panels do you need — and will they fit?
Before you talk to a single installer, it helps to know what solar could actually do for your home. How many panels fit your roof? How much could you save? When does the system pay for itself? This free tool answers those questions from satellite roof data in seconds — no salesperson required.
How homeowners use their solar estimate
Size the system: See how many panels fit and your potential system size in kW
Estimate savings: Get a ballpark for annual and 25-year savings before calling anyone
Check the payback: Know roughly how many years until the system pays for itself
Shop with confidence: Walk into installer quotes already knowing the numbers
What your free solar estimate includes
- Panels that fit: How many solar panels your roof can hold based on usable area
- System size: Estimated capacity in kilowatts (kW)
- Annual savings: Estimated yearly electricity savings from going solar
- Payback period: Roughly how many years to recover the system cost
- System cost before incentives: Estimated gross installation price
- Lifetime savings: Estimated total savings over 25 years
Prepare for installer quotes with the printable checklist.
A note on accuracy
These numbers are estimates based on Google Solar roof data and average local electricity rates. Your actual results depend on your real energy use, roof shading, panel choice, local rates, and installer pricing — so treat this as a confident starting point, not a final quote.
Bring better questions to a solar installer
Use your browser’s Print command to print this page and checklist, then fill the blanks by hand. This starter needs no address or email. Your bills and roof records are facts you supply; this tool’s output is a planning estimate. An installer must inspect the site and provide a written quote.
Gather your own facts
- Collect 12 months of electricity bills: usage in kWh, billing dates, current tariff and fixed charges. Note planned loads such as an EV or heat pump.
- Gather available roof age, repair and warranty records. Mark unknowns; an imagery result does not establish roof condition or remaining life.
Ask each installer the same questions
- What site inspection, shading, usable roof area, structural or electrical work, permits and utility approval does this design require?
- Which panels, inverter and optional battery are included? Ask for system size in kW, annual production in kWh, equipment warranties and exclusions.
- Which electricity rates, export credits, production changes and maintenance or replacement costs support the savings forecast? Compare those assumptions with your own bills.
- Request an itemized gross installed cash price. Price roof repairs, electrical upgrades and optional equipment separately; compare financing APR, fees, term and total repayment if borrowing.
- Ask for the installation schedule, payment milestones, workmanship coverage and responsibility for utility approval. Record what is still unconfirmed.
Incentive check, October 19, 2026: For a new residential installation completed after December 31, 2025, do not subtract the federal residential clean energy credit. Prior qualifying installations and unused-credit carryforwards are separate questions. Check the IRS Form 5695 instructions and IRS completion-date FAQ. Confirm any current state or utility program and eligibility separately; this tool deducts no incentives.
Write on your printed copy
Bill period / annual kWh:
Roof record / source and date:
Installer / gross quote / date:
Open question / next action and owner:
Continue manually: After signing in and selecting the correct home, use Projects to record confirmed scope and Records to upload your own bills or quotes. This checklist does not create or save a project, transfer your notes, or contact an installer.
Frequently asked questions
How accurate is this solar estimate?
The estimate is based on Google Solar roof data (sun exposure, usable area, and orientation) and average local electricity rates. It’s a confident starting point, but your actual results depend on your real energy use, roof shading, panel choice, local rates, and installer pricing. Treat it as a ballpark, not a final quote.
What addresses are covered?
We have solar coverage for most residential properties in the United States where Google Solar data is available. Rural or newly constructed properties may have limited or no data — if that’s the case, we’ll let you know and save your info in case coverage expands.
How many solar panels will fit on my roof?
The tool estimates how many standard panels fit based on your roof’s usable area, orientation, and shading from satellite data, then shows the resulting system size in kilowatts (kW). Larger, sunnier, less-shaded roofs fit more panels.
How many solar panels do I need to power my house?
Most U.S. homes need roughly 15–25 panels to offset their electricity use, but the real answer depends on your usage and your specific roof. Enter your address above to see how many panels actually fit on your roof and the system size in kW they would support.
How are the savings calculated?
Annual savings come from your estimated system’s yearly production multiplied by your area’s average electricity rate. Lifetime savings project that out over 25 years. No incentives are deducted. The federal residential credit ended for installations completed after December 31, 2025; verify local programs separately.
Do I have to talk to a salesperson?
No. You get your full estimate instantly on screen — no phone calls and no high-pressure sales pitch. You’re free to use the numbers however you like.
Is this really free?
Yes, this tool is completely free for homeowners. No credit card required and no hidden fees. We built it to help you make an informed decision about going solar.
How do I use BuildFolio’s free solar estimate tool?
Enter a US address to see the free preview. Enter your email to request the full planning estimate, including system cost before incentives. Current estimates deduct no incentives; older saved estimates may have unverified assumptions and withhold payback or lifetime figures. These are modeled results, not an installer quote.
Ready to see your home’s solar potential?
Get your free solar estimate — panels, savings, and payback — in seconds. No signup.
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