Wondering what your gas and electricity bill will actually look like this quarter? This free UK energy bill calculator uses the latest Ofgem Price Cap unit rates and standing charges so you can estimate your annual and monthly energy costs in seconds — just edit the numbers below to match your own usage or your supplier’s current rates.
UK Energy Bill Calculator (Ofgem Price Cap)
Electricity
Gas
Annual electricity cost: £0.00
Annual gas cost: £0.00
Total annual bill: £0.00
Monthly average: £0.00
Default figures are illustrative examples based on typical recent Ofgem Price Cap levels — always check the current cap on Ofgem’s website and enter your own supplier’s rates for an accurate estimate.
How the Ofgem Price Cap Works
The Ofgem Energy Price Cap is often misunderstood — it does not cap the total amount you can be charged. Instead, it caps the maximum unit rate (pence per kWh you use) and the maximum standing charge (a fixed pence-per-day fee) that suppliers can charge customers on a standard variable tariff. This means two households on the same tariff can still end up with very different bills, because the cap limits price, not consumption. If you use more energy, you pay more — even though the rate is capped for everyone.
The cap applies across England, Scotland and Wales and is reviewed and reset every three months by Ofgem, the UK’s independent energy regulator, based on wholesale energy market costs, network costs and supplier operating costs.
Current Price Cap Figures Explained
Ofgem reviews and updates the price cap four times a year, with new rates typically taking effect on 1 January, 1 April, 1 July and 1 October. Because rates change quarterly, the unit rate and standing charge figures pre-filled in the calculator above are illustrative examples only — always check Ofgem’s official announcement or your supplier’s tariff information for the exact current figures before relying on your result for budgeting.
As a rough guide, recent typical dual-fuel figures for a medium-usage household have looked something like this:
- Electricity unit rate: roughly 24-28p per kWh
- Electricity standing charge: roughly 45-60p per day
- Gas unit rate: roughly 6-7p per kWh
- Gas standing charge: roughly 30-35p per day
These ranges vary by region and by supplier within the cap, so your own bill may differ slightly even on a capped tariff.
What Is a “Typical” Household Usage?
When Ofgem announces a headline “typical annual bill” figure, it is based on a standardised usage assumption called the Typical Domestic Consumption Value, or TDCV. This represents a medium-usage household and is currently set at around 2,700 kWh of electricity and 11,500 kWh of gas per year.
In reality, very few households use exactly this amount. Usage depends heavily on the size of your home, how many people live there, how well insulated the property is, what heating system you use, and your day-to-day habits. A one-bedroom flat with good insulation could use far less gas than the TDCV assumes, while a large, older, poorly insulated house could use significantly more. That is exactly why this calculator lets you enter your own usage figures rather than relying only on the national “typical” average.
Standing Charge vs Unit Rate — What’s the Difference
Your energy bill is made up of two separate components for each fuel:
- Standing charge — a fixed daily fee you pay regardless of how much energy you use, covering the cost of connecting your home to the network and maintaining the supply infrastructure. It applies every single day, even if you use zero energy.
- Unit rate — the price you pay per kWh actually consumed. This is the variable part of your bill and directly reflects your usage.
Low-usage households, such as people who work away from home often or live alone in a small flat, tend to feel the standing charge as a proportionally larger part of their bill, since it doesn’t shrink even if consumption does.
How to Reduce Your Energy Bill
While the price cap limits the rate suppliers can charge, there is still plenty you can do to bring your actual bill down:
- Get a smart meter fitted — free from your supplier, it gives you accurate real-time usage data instead of estimated bills.
- Consider an off-peak or time-of-use tariff — if you can shift usage like EV charging, washing or dishwashing to cheaper overnight hours, some tariffs reward this significantly.
- Improve insulation — loft and cavity wall insulation, draught-proofing doors and windows, and thermostatic radiator valves can meaningfully cut gas usage for heating.
- Check Warm Home Discount eligibility — a one-off annual discount off your electricity bill for eligible low-income households, usually applied automatically or via a short application depending on your supplier and circumstances.
- Check Winter Fuel Payment eligibility — an annual payment towards heating costs for people who have reached State Pension age, with eligibility and payment amounts subject to household circumstances and current government rules.
- Turn heating down by even 1 degree — a small, often unnoticeable adjustment that can produce a measurable saving over a full winter.
Worked Example
Take a medium-usage household with 2,700 kWh of electricity a year at 27p/kWh and a 53p/day standing charge, plus 11,500 kWh of gas a year at 6.5p/kWh and a 32p/day standing charge.
- Electricity usage cost: 2,700 x 0.27 = £729.00
- Electricity standing charge: 0.53 x 365 = £193.45
- Electricity total: £922.45
- Gas usage cost: 11,500 x 0.065 = £747.50
- Gas standing charge: 0.32 x 365 = £116.80
- Gas total: £864.30
- Combined annual bill: £1,786.75, or roughly £148.90 a month
Plug in your own usage and current supplier rates in the calculator above to get a figure tailored to your household.
FAQs
Does the Ofgem Price Cap mean my bill is capped at a fixed amount?
No. The cap limits the unit rate and standing charge suppliers can charge on standard variable tariffs — it does not cap your total bill. If you use more energy, your total bill still goes up, even though the price per unit is capped.
How often does the price cap change?
Ofgem reviews and updates the price cap every three months, with new rates usually starting on 1 January, 1 April, 1 July and 1 October.
Why is my bill higher than the Ofgem “typical annual bill” figure?
The headline figure is based on a standardised medium-usage assumption (TDCV) of around 2,700 kWh electricity and 11,500 kWh gas a year. If your home is larger, less insulated, or has more occupants, your actual usage — and therefore your bill — will likely be higher than this typical figure.
What’s the difference between the standing charge and the unit rate?
The standing charge is a fixed daily fee charged regardless of usage, covering network and supply costs. The unit rate is the price per kWh you actually consume. Together they make up your total bill for each fuel.
Can I reduce my bill even though the unit rate is capped?
Yes. Reducing your actual energy consumption through insulation, efficient habits and smart meters, switching to off-peak tariffs where beneficial, and checking eligibility for support schemes like the Warm Home Discount or Winter Fuel Payment can all lower your real bill even under a capped rate.
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