Solar Panel Cost Calculator
Enter your proposed system, electricity use, tariff rates and all-in quote. The calculator estimates annual generation, bill savings, export income and payback. For an estimate based on a specific building, use the solar roof calculator.
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The starting import rate is Ofgem’s price-cap rate for GB average, Direct Debit, 1 October 2026 to 31 December 2026 (Ofgem). Use the rate shown on your own tariff if you have it.
Replace the starting value with the rate offered by your export tariff.
Recent small-installation figures: median £1,780/kW and mean £2,008/kW. Enter the all-in quote for your proposed system.
Estimated roof area: 3.4 m²
This is a simplified self-consumption scenario only. Include any battery in the total installed quote; no battery price is invented here.
£128 per year in combined savings and export income.
Total annual benefits
£128
Combined savings and export income
Payback period
Enter quote
Time to recover the all-in quote you enter
Annual savings
£102
15% of your annual bill (£658)
Export income
£26
581 kWh at 4.5p/kWh
System size
0.9 kWp
2 panels (440W each)
Installation cost
Enter quote
Your all-in installed quote; no modelled substitute
Annual production
968 kWh
Yearly energy generation
Self-consumption
40%
40% modelled maximum without a battery; capped by household use
Improve your estimate
- Use the proposed panel count and rated power from your installer.
- Enter annual electricity use and tariff rates from recent bills.
- Include the full installation and battery price in the quote.
- Check roof direction, angle and shading before relying on the result.
Costs and savings
The latest published figures for small installations show a median of £1,780 per kW and a mean of £2,008 per kW. These are useful context, but they are not a quote for your roof. Savings depend on how much solar electricity you use yourself and the export rate your supplier offers.
Frequently asked questions
How much do solar panels cost in the UK?
The latest published figures for small installations show a median of £1,780 per kW and a mean of £2,008 per kW. These are useful context, but they are not a quote for your roof. Enter an all-in quote for the system you are considering before using the payback result.
How much can solar panels save me?
Savings depend on generation, how much solar electricity you use at home, your import rate and the export tariff you receive. Use your own tariff and an installer’s generation estimate where possible.
Which regions get the most solar energy in the UK?
Homes in sunnier parts of the UK will usually generate more from the same system, but roof direction, angle and shading also matter. For an address-specific estimate, use the solar roof calculator.
How long does it take for solar panels to pay for themselves?
There is no single payback period. It depends on the installed price, generation, electricity use and tariff rates. This calculator works it out from the figures you enter.
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See the seven-day generation forecast or compare storage with the solar battery calculator.
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