Ofgem Energy Price Cap Calculator
Use your Great Britain energy region, payment method and annual kWh to apply the current capped rates.
Annual energy bill
London · Direct debit
Monthly equivalent
Annual estimate ÷ 12
Standing charges/year
Electricity + gas
Electricity
26.60p/kWh
42.92p/day standing · £822/year
Gas
8.15p/kWh
30.20p/day standing · £884/year
The cap limits rates, not your total bill. Actual cost changes with usage. Fixed tariffs are not covered, and multi-rate electricity requires separate peak/off-peak modelling.
How this calculator uses Ofgem data
Every rate is derived from Ofgem's official Annex 9 nil-consumption and benchmark charges for 2,500 kWh electricity and 9,500 kWh gas, then adds VAT for the cap period (VAT: 0% on electricity (temporarily zero-rated from 1 October 2026 to 31 March 2027) and 5% on gas). The result is an annualised estimate even though this cap period lasts three months.
Frequently asked questions
Does the Ofgem price cap limit my total bill?
No. It caps unit rates and standing charges on default tariffs. Your bill still rises or falls with energy use.
What period does this calculator cover?
It defaults to the Ofgem cap in force, 1 October to 31 December 2026, and includes VAT: 0% on electricity (temporarily zero-rated from 1 October 2026 to 31 March 2027) and 5% on gas. The calculator can also price any other published cap period.
Are fixed tariffs covered?
No. A fixed tariff has contract rates. Compare those rates directly with the capped unit rates and standing charges.
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