Get Started

Energy Savings:

Air source heat pumps

Solar panels

Battery storage

Solar panel calculator

See how many panels you’ll need for your home with our solar panel calculator. In just a few clicks, you’ll have a savings estimate based on your location and energy use. Start now!

Build your free quote now
solar install

How to use our solar panel calculator

To use our solar panel calculator, you just need to provide some basic information about your home, including:

  • Location
  • Roof size and orientation
  • Average energy use

Once you’ve done that, the solar panel calculator will tell you:

  • How many solar panels you need
  • The estimated output (in kWh per year)
  • How much your solar package may cost

Try our solar panel calculator today and see how much you could save with a bespoke solar system.

Build my free solar quote
solar panel installation on home

How the solar panel calculator works

The solar panel calculator uses your address to pull satellite data and map the shape and size of your roof. It then factors in your roof direction, pitch, shading, and a number of floors to understand your solar potential. Based on this, we run performance estimates and calculate how many solar panels you could install, your expected output, and the best-fit packages for your home.

Build your free quote today

Ready to save on energy bills? Use our free solar panel calculator to get started.
Get your free quote now
Trustpilot

Fully certified solar installs

  • jinko-solar-logo
  • huawei-logo
  • giv-energy-logo
  • growatt-logo
  • fox-ess-logo
  • viridian-solar-logo
  • esdec-logo
  • solar-edge-logo
  • solis-inverters
  • schletter-logo
  • Rectangle-e1725528041152
  • lg-logo
  • Tesla Energy
  • Construction Line
  • JA Solar
  • Gas Safe Register
  • msc logo
  • big-recc-ctsi-code-logo-colour

Frequently Asked Questions

How much electricity do you get from one solar panel?

The amount of electricity you get from a solar panel depends on a number of factors, including the efficiency of the panel, the amount of daylight it receives, and the temperature. In general, a typical solar panel can produce up to 450 watts of power in full daylight.

How many solar panels are needed for 1 kW?

Three panels should be enough to generate this amount of electricity.

How much power does a 4 kW solar system produce per day?

Taking daylight hours and exposure to direct sunlight into consideration, a 4 kW system would typically produce around 19 – 20 kW hours of electricity per day in optimal summer conditions.

Can I have too many solar panels?

Yes, you can have too many solar panels. More isn’t always better. Installing more than you need can push up costs without much extra benefit. A solar panel calculator helps you strike the right balance between energy output, system cost, and available roof space.

How do I calculate how many solar panels I will need?

Our solar panel calculator gives you an accurate estimate based on your roof size. It uses satellite imagery to map your roof, then calculates how many panels can fit and what you’d likely need based on your energy use.

What is a solar panel calculator?

A solar panel calculator is an online tool that estimates how many solar panels you might need, based on your roof size, building details, and energy usage. It gives you a quick, personalised overview, without the need for a site visit or any technical knowledge.

Why should I use a solar panel calculator?

Using a solar panel calculator takes the guesswork out of going solar. By entering a few details, you’ll instantly see custom system options that suit your property and budget. It’s fast, free, and helps you make informed choices before speaking to an installer.

Latest energy funding news

Real results, real people

It’s not just numbers on a page – it’s real people saving real money. We’ve helped homes, businesses, and local authorities just like yours unlock a brighter energy future.

Trustpilot