Estimate annual solar yield—then inspect every assumption.
Model system size, region, orientation, shade and self-use. The estimate is indicative, so test it against your own roof.
Solar yield calculator
The model multiplies kWp by a regional factor, an orientation factor and a shade factor. However, a professional design should still use data from your own roof.
Your result will appear here.
Change any input and run the check again. Nothing leaves this page, because the sums run in your browser.
Move from first question to informed decision.
Short guides cover the choices people often blur together. Each one links to the next step.
Run an estimate
Change the important variables and see annual generation and indicative bill value. Read guide 02Understand the factors
Why location, orientation, inclination and shading change the result. Read guide 03Interpret the result
Separate generation, self-use, export and financial assumptions. Read guide 04Compare scenarios
Test conservative, central and higher cases rather than betting on one forecast. Read guide 05Audit the method
See the simplified formula, exclusions and link to the formal MCS standard. Read guide 06Keep data private
Everything calculates locally with no account, tracking or saved inputs. Read guideA calmer way to make the decision.
The tool is a starting point. Written evidence and qualified confirmation finish the job.
- 01
Set
Enter system and site assumptions without personal information. - 02
Stress-test
Change orientation, shade, self-use and tariffs. - 03
Verify
Compare with an installer’s documented site-specific calculation.
What Solar Yield does for you
Solar Yield is an independent estimator for UK homes. It shows how much electricity a roof might make in a year. Every assumption stays on screen, so you can change it and see the effect.
The calculator runs in your browser and stores nothing. However, it is a simple model, not a design. Your installer should confirm the numbers with a survey of your roof.
When you want quotes, send one short enquiry. The operator reviews it in the MoreLeadz lead system and matches it with MCS-certified installers who cover your postcode. No installer gets your details automatically.
Solar Yield is not an installer, lender, broker or government service. We have no phone line and no published address. Because of that, the form is the only way to reach us.
Our figures come from PVGIS, Ofgem, DESNZ and MCS. We check each one and note its date. For example, the city pages use PVGIS output for 24 UK cities.
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We ask for your postcode and one way to reach you, because installers need both to quote. Your request goes to the central MoreLeadz lead dashboard, where the operator matches it with MCS-certified installers.