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Energy Price Cap Calculator
See what you pay now under the confirmed cap, and what the predicted January 2027 rise could add.
Last updated: 17 May 2026
Your yearly usage
Find these on a recent bill or in your supplier's app. They are measured in kWh.
Defaults are the Ofgem typical household figures: 2,500 kWh of electricity and 9,500 kWh of gas.
The rates used
Electricity: 26.32p per kWh plus 54.83p a day standing charge.
Gas: 7.969999999999999p per kWh plus 29.68p a day standing charge.
Confirmed Direct Debit averages for England, Scotland and Wales, October to December 2026. No VAT is charged on electricity until 31 March 2027. Source: Ofgem.
Predicted January 2027 bill
£179.40 / month
£2,153 a year, up £35.76 a month (£429 a year) if the prediction holds.
What you pay under the confirmed cap
£143.63 / month
£1,724 a year at the October to December 2026 cap.
Where it goes
Your bill is usage plus standing charges. The cap limits the rates, not the total, so using less energy always lowers the bill.
Cross-check against Ofgem
A typical household using 2,500 kWh of electricity and 9,500 kWh of gas pays £1,723 a year under the confirmed cap. If the predicted 24.9% rise goes ahead, that becomes about £2,152. Set the inputs above to the typical figures and the calculator will land on the same numbers.
Should you fix your tariff?
A fixed deal protects you from the January rise, but only if the rate is low enough. Compare the unit rate and standing charge of any fix against the predicted cap, not just the monthly figure, and check the exit fee. Our January 2027 price cap guide covers the prediction in detail, and the guide to cutting your energy bills shows where to save without switching.
Frequently Asked Questions
How does the energy price cap calculator work?
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Enter your yearly electricity and gas use in kWh. The calculator applies the confirmed Ofgem price cap unit rates and standing charges for October to December 2026 to your usage, then shows what the same usage could cost if the predicted January 2027 rise goes ahead.
What rates does it use?
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It uses the confirmed Direct Debit averages for October to December 2026: electricity at 26.32p per kWh and gas at 7.97p per kWh, with standing charges of 54.83p and 29.68p a day. These are averages for England, Scotland and Wales, and your regional rates will differ.
How accurate is the January 2027 prediction?
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It is a forecast, not a confirmed figure. EDF, British Gas and E.On Next predicted a rise of about 24.9% in the week of 14 September 2026. Ofgem confirms the real level on 25 November 2026, and the forecast can move a lot before then.
Does the cap limit my total bill?
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No. The cap limits the unit rates and the daily standing charges, not the size of your bill. Use more energy and you pay more. The calculator reflects that because it is built from your own kWh figures.
Where do I find my yearly energy usage?
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Check a recent bill or your supplier's app. Look for the annual or yearly usage figures, shown in kWh. If you have a smart meter, the usage summary is usually on the first page of the bill.
Should I fix my tariff before January?
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A fixed deal priced below the predicted cap can protect you through the winter quarter. Compare unit rates and standing charges rather than the headline annual figure, and check the exit fees. If you are on a standard variable tariff, the cap applies automatically.