Energy Bill Calculator
Estimate your combined gas and electricity bill using the 2025 Ofgem price cap — unit rates plus standing charges — for any billing period, monthly and yearly.
Dual-fuel bill estimate
Gas + electricity, Ofgem cap 2025.
Based on the Ofgem dual-fuel price cap. The £1,755/yr "typical" figure assumes 2,700 kWh elec + 11,500 kWh gas a year.
How your combined energy bill works
A dual-fuel energy bill is just your electricity and gas costs added together. Each fuel has its own unit rate (charged per kWh) and its own daily standing charge. This calculator combines all four numbers over your billing period, using the 2025 Ofgem price-cap defaults you can edit to match your tariff.
The Ofgem price cap for a typical dual-fuel home is £1,755 a year (Oct–Dec 2025). That assumes about 2,700 kWh of electricity and 11,500 kWh of gas a year, at 26.35p and 6.29p per kWh plus standing charges of 53.68p and 34.03p a day.
2025 Ofgem price cap at a glance
| Charge | Electricity | Gas |
|---|---|---|
| Unit rate | 26.35p / kWh | 6.29p / kWh |
| Standing charge | 53.68p / day | 34.03p / day |
| Typical annual use | ≈ 2,700 kWh | ≈ 11,500 kWh |
Source: Ofgem — energy price cap Oct–Dec 2025. Typical household; your bill will vary.
What the price cap does and doesn't do
The price cap limits the unit rate and standing charge, not your total bill — so the more energy you use, the more you pay. The widely quoted £1,755 figure is for a typical household only. The fastest way to cut a bill is to reduce kWh used (heating, hot water and tumble-drying are the big ones) and to check whether a fixed deal beats the cap.
Frequently asked questions
How is my energy bill calculated?
Add your electricity cost (kWh × unit rate) and gas cost (kWh × unit rate), then add both daily standing charges multiplied by the number of days. The calculator does all four parts and shows monthly and annual totals.
What is the Ofgem price cap for 2025?
For October to December 2025 the cap sets a typical dual-fuel bill of £1,755 a year. Electricity is 26.35p per kWh with a 53.68p daily standing charge; gas is 6.29p per kWh with a 34.03p daily standing charge.
Does the price cap mean my bill can't go above £1,755?
No. The £1,755 figure is for a typical household. The cap limits the rate per unit and the standing charge, not your total, so a larger or less efficient home will pay more.
How can I lower my energy bill?
Reducing the kWh you use is the most effective step — especially heating, hot water and high-power appliances. Comparing a fixed-rate deal against the cap, and checking your standing charges, can also help.
Where do I find my kWh usage?
Your energy bill or online account shows kWh used for each fuel over the billing period. If your gas meter reads in cubic metres, multiply by about 11.2 to convert to kWh.