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Energy saving calculators and tools

Solar panel calculator

Find out how much you could save with solar

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Use our solar panel calculator to get an idea of how much you could save by installing a solar photovoltaic (PV) system at home.

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By answering just three questions, the solar panel calculator will estimate:

  • How many solar panels should be right for your roof space.
  • How much you could save on your electricity bills.
  • Installation costs.
  • How much could you lower your carbon footprint.

You can then personalise your results to get even more accurate figures.

Once you have your results, you can use them to speak to a solar panel installer. They can give you more tailored advice on your solar panel setup.

For more information on solar panels, read our solar panel guide.

Screenshots of the solar panel calculator showing how the tool looks on a mobile device.

Find out how much you could save by installing solar panels

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Last updated: 18 July 2025