Energy Bill Calculator
Estimate how much you should expect to pay for gas and electricity over any time period — daily, monthly or annually.
We've created this electricity and gas bill calculator to help you estimate how much you should be expecting to pay for your energy over any set period of time.
This is both an electricity bill calculator and a gas energy bill calculator. You can use it to calculate either gas or electricity bills (or both these utility bills together!)
This may be because you are moving home and want to work out how much more or less you may have to pay, or maybe you are looking to switch tariffs and see how much you could save on your utility bills. Whatever your reason, keep reading to see how to use our free energy bill calculator and find out what you need to know.
Use our referral link, and we'll both get £50 credit once your switch is complete.
Existing customer? Find out how you can benefit too. T&Cs apply (only one switching offer per household)
Are you being overcharged?
A total on its own does not tell you whether it is fair. What does is your unit rate and standing charge next to the maximum Ofgem allows for your region and payment method — the two things the price cap actually limits.
Are your rates above the price cap?
The cap limits unit rates and standing charges, not your total bill — a household using more energy pays more and is still capped. Put your own rates in and compare them against the published maximum for your region and payment method.
| Rate | Yours | Cap | Verdict |
|---|---|---|---|
| Electricity unit rate | — | 26.11p | — |
| Electricity standing charge | — | 57.19p | — |
| Gas unit rate | — | 7.33p | — |
| Gas standing charge | — | 29.04p | — |
If your rates are within the cap and the bill is still more than you can pay, that is affordability rather than overcharging. The consumer scheme register records what each scheme is, what it is worth and where to apply. It does not decide whether you qualify, and nothing on this page is an eligibility test — read the published criteria and apply officially.
How to use our electricity and gas energy bill calculator
You need to start by deciding how many days you want to look at, one day, one week, one year or anything in between.
Next, the energy cost calculator needs to know your daily electricity and gas consumption. This can be worked out from your latest energy bill, or you can use our average estimates below.
The next two pieces of information you will need to get from your utility bill will differ depending on your energy supplier and tariff.
Your unit rate is how much you pay for each unit of electricity, and your standing charge is a fixed amount you pay per day regardless of how much energy is used.
Once you put all these details in, you will automatically see a breakdown of your total unit charge over the period you set, the total cost of your standing charge, and your overall bill for that period of time.
What is a Unit of Electricity?
A unit of electricity refers to one kilowatt-hour (kWh) of energy consumption. A kilowatt-hour means you have used 1,000 watts of electricity for one hour. For example:
The total units you consume are recorded on your electricity meter and are used to calculate your electricity bill, based on the unit rate charged by your energy provider.
What is a Unit of Gas?
A unit of gas refers to the amount of gas you consume, measured in kilowatt-hours (kWh). However, gas meters typically measure consumption in cubic meters (m³) or cubic feet (ft³). To calculate how many units of gas you've used (in kWh), your energy supplier converts the volume of gas recorded on your meter into kilowatt-hours using a standard formula.
The calculation factors in:
- Volume of gas used (m³ or ft³)
- Calorific value (the energy content of the gas)
- Correction factor (to adjust for pressure and temperature differences)
The total units of gas consumed in kilowatt-hours (kWh) are used to calculate your gas bill based on the unit rate your supplier charges.
What is a Daily Standing Charge?
A daily standing charge is a fixed cost you pay to your energy supplier every day, regardless of how much energy you use. It covers the costs associated with maintaining the energy network, including:
- Maintaining energy infrastructure (like power lines and substations)
- Billing and customer services
- Government schemes for zero-carbon energy
The daily standing charge is applied as a set daily rate and is added to your energy bill alongside the unit rate charges for the energy you use. Even if you don't use any energy, you'll still need to pay the daily standing charge.
Average energy usage per household type (2025)
If you aren't sure of your energy usage, below we have given you the average monthly usage for various property types in the UK according to Ofgem.
Your usage will vary depending on property age, number of occupants, types of appliances etc.
| Property type | Daily | Monthly | Annual |
|---|---|---|---|
| 1 Bedroom Flat | 5 | 150 | 1,800 |
| 2 Bedroom House | 6 | 175 | 2,100 |
| 3 Bedroom House | 8 | 250 | 3,000 |
| 4 Bedroom House | 10 | 290 | 3,480 |
| 5 Bedroom House | 12 | 360 | 4,320 |
Note: This is the average monthly usage over 12 months. Usage may be higher in the winter months.
| Property type | Daily | Monthly | Annual |
|---|---|---|---|
| 1 Bedroom Flat | 21 | 625 | 7,500 |
| 2 Bedroom House | 25 | 750 | 9,000 |
| 3 Bedroom House | 32 | 958 | 11,500 |
| 4 Bedroom House | 41 | 1,250 | 15,000 |
| 5 Bedroom House | 47 | 1,417 | 17,000 |
Note: This is the average monthly usage over 12 months. Usage may be higher in the winter months.
We also have a gas bill calculator and electricity bill calculator available.
Frequently asked questions
What is a unit of electricity?
A unit of electricity refers to one kilowatt-hour (kWh) of energy consumption. A kilowatt-hour means you have used 1,000 watts of electricity for one hour.
What is a unit of gas?
A unit of gas refers to the amount of gas you consume, measured in kilowatt-hours (kWh). Gas meters typically measure consumption in cubic meters or cubic feet, which your supplier converts to kWh using a standard formula.
What is a daily standing charge?
A daily standing charge is a fixed cost you pay to your energy supplier every day, regardless of how much energy you use. It covers costs like maintaining energy infrastructure, billing and government schemes for zero-carbon energy.
How much electricity does a typical UK household use?
Ofgem sets the figure used across the industry for a typical household: 2,500 kWh of electricity a year, or about 7 kWh a day, since 1 July 2026. It was 2,700 kWh before that, so an older comparison is not measuring the same household. Ofgem publishes low, medium and high values rather than a figure per bedroom, and a home with electric heating or an EV will use considerably more.
How much gas does a typical UK household use?
Ofgem’s typical household figure is 9,500 kWh of gas a year, or about 26 kWh a day, since 1 July 2026. It was 11,500 kWh before that — a 17% reduction that reflects Ofgem revising the assumption, not households suddenly using less. The per-bedroom estimates in the table above are a separate industry rule of thumb and are not Ofgem figures.
Other calculators
- £Calculator
Gas Bill Calculator
Calculate your gas bill over any time period using your standing charge, unit rate and daily usage.
Open calculator → - £Calculator
Electricity Bill Calculator
Calculate your electricity bill over any time period using your standing charge, unit rate and daily usage.
Open calculator → - £Calculator
Standing Charge Calculator
Work out how much your daily standing charge is costing you per week, month and year for gas and electricity.
Open calculator →
Written by
Rob Gibbs
Hi, I'm Rob, and I run Energy-Review.co.uk. I initially started this project in 2018 when I was looking to switch energy suppliers and found there wasn't a website that provided simple, data-backed reviews on all the suppliers available. Since then, I have spent a lot of time (too much, some may say!) looking at all publicly available data about each supplier and writing reviews using this information. These reviews are updated as regularly as possible, and any data is backed up by a source where necessary. I have also started writing guides on various energy-related topics, which hopefully you will find useful. If you find any issues, please use our contact form to let us know.