A UK energy bill calculator helps you estimate your annual gas and electricity costs based on Ofgem price cap rates. Whether you are on a standard variable tariff, direct debit, or prepayment meter, this tool breaks down your standing charges and unit costs so you can budget accurately and compare usage levels.
Energy Usage
No gas supply (all-electric home)
May reduce prepayment surcharge
Cost Breakdown
| Component | Annual | Monthly |
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Usage Comparison
| Usage Level | Electricity | Annual Cost | Monthly |
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Energy Saving Tips
- Turn your thermostat down by 1 degree C — saves around 10% on heating bills, roughly 80-130 pounds per year.
- Switch to LED bulbs — an LED uses 75% less energy than an incandescent and lasts 10 times longer.
- Use a smart meter — seeing real-time usage helps most households cut consumption by 3-5%.
- Draught-proof doors and windows — simple draught excluders cost a few pounds and can save 25-50 pounds per year.
- Wash at 30 degrees C — uses around 40% less electricity than washing at 40 degrees C.
- Only boil the water you need — overfilling the kettle wastes energy on every brew.
Rates are approximate and based on Ofgem price cap data. Your actual bill may differ depending on your supplier, tariff, and usage patterns. Always check with your energy supplier for exact rates.
How to Use the UK Energy Bill Calculator
Energy costs are one of the biggest household expenses in the UK, and understanding your bill can be confusing with standing charges, unit rates, and different payment methods. This UK energy bill calculator uses Ofgem price cap rates to give you a clear estimate of your annual, monthly, and daily energy costs so you can budget effectively and spot opportunities to save.
Step 1: Choose Your Usage Level
Select from three Ofgem-defined usage tiers: Low (1,800 kWh electricity, 8,000 kWh gas), Medium (2,700 kWh electricity, 11,500 kWh gas), or High (4,100 kWh electricity, 17,000 kWh gas). If you know your exact annual consumption from a recent bill or smart meter data, choose Custom and enter your figures directly. The medium tier represents the typical UK household and is the basis for Ofgem's headline price cap figures.
Step 2: Set Your Options
If you live in an all-electric home without a gas supply, toggle on the electricity-only option. This removes gas standing charges and unit costs from your estimate. You can also indicate whether you have a smart meter, which may slightly reduce prepayment surcharges. Then select your payment method: Direct Debit is the standard and cheapest option, Prepayment meters add roughly 5% to costs, and Standard Credit (quarterly billing) adds around 10%.
Step 3: Review Your Estimate
Click the estimate button to see your results. The summary cards show your total annual cost, monthly cost, daily cost, and how much goes to standing charges alone. The detailed breakdown table separates electricity and gas costs into standing charges and unit costs so you can see exactly where your money goes. Standing charges are fixed regardless of how much energy you use.
Step 4: Compare Usage Levels
The comparison table shows estimated annual and monthly costs for all three Ofgem usage tiers using your selected payment method. This is useful for understanding how much you might save by reducing consumption, or how much more you would pay if your usage increased. The row matching your current selection is highlighted for easy reference.
Understanding the Ofgem Price Cap
The Ofgem price cap sets the maximum unit rates and standing charges that energy suppliers can charge on their default tariffs. It is updated quarterly and applies to most households in England, Wales, and Scotland. The cap does not limit your total bill — it limits the rate per unit. If you use more energy, you pay more. Fixed-rate tariffs may be above or below the cap depending on market conditions. Always compare tariffs using your supplier or a price comparison service to find the best deal.
FAQ
Is this UK energy bill calculator free?
Yes, the UK Energy Bill Calculator is completely free to use. No account, signup, or personal information is required. All calculations run locally in your browser.
Is my data private?
Absolutely. All inputs and calculations happen entirely in your browser. Nothing is sent to any server or stored anywhere. Your energy usage information stays completely private.
What are the current Ofgem price cap rates?
The calculator uses approximate Q1 2026 Ofgem price cap rates: electricity at around 24.5p per kWh with a 29p daily standing charge, and gas at around 6.8p per kWh with a 32p daily standing charge. Actual rates from your supplier may differ slightly.
What is a standing charge?
A standing charge is a fixed daily fee your energy supplier charges regardless of how much energy you use. It covers the cost of maintaining the connection to your home. Standing charges are set by Ofgem and apply to both gas and electricity separately.
How much does a typical UK household pay for energy?
Under the Ofgem price cap for Q1 2026, a typical medium-use household using 2,700 kWh of electricity and 11,500 kWh of gas per year pays approximately 1,700 to 1,900 pounds annually. Actual costs depend on your usage, payment method, and tariff.
Why does prepayment cost more than direct debit?
Prepayment meters typically have slightly higher unit rates and standing charges compared to direct debit tariffs. This is because prepayment involves higher administrative costs for suppliers. The difference is usually around 5% more overall.
What if I have an all-electric home with no gas?
Use the electricity-only toggle to remove gas from your calculation. All-electric homes often use more electricity for heating, so you may want to select a higher usage preset or enter custom kWh figures that reflect your actual consumption.
How accurate is this energy bill estimate?
This calculator provides a good estimate based on Ofgem price cap rates. Your actual bill may differ because suppliers can charge below the cap, and your usage patterns vary seasonally. Always check your specific tariff details with your energy supplier for the most accurate figures.