It's really important to take and regularly send accurate gas meter readings to your energy supplier – if you don’t know how to use your meters correctly, you can’t be sure you’re getting billed correctly.
Most electricity and gas suppliers will estimate your energy usage, but if you regularly provide them with accurate gas meter readings, you’re more likely to pay for the energy you actually used, rather than for your suppliers’ best guess.
If you want to find out what your gas usage is in kilowatt hours (kWh), just pop the number of units you use into the calculator below, and it’ll give you an exact figure, so you can make sure you’re being charged correctly for what you use and the readings you have.
For imperial meters, the reading is in hundreds of cubic feet (100 ft³), so if your meter shows a usage of 1, you've actually used 100 ft³.
Your reading is then multiplied by 2.83 to convert to cubic metres (if the reading to the supplier was provided in cubic feet then this should be multiplied by 0.0283).
If you need any further help reading your gas meter, take a look at our Gas and electricity meter readings page.
It's important to take accurate gas meter readings to avoid over or underpaying for your energy.
If you don’t give regular readings, your supplier will base your bills on how much gas it assumes your using, and this estimate can be inaccurate, to the point where it costs you money - overpaying could mean you struggle to pay your energy bills, while underpaying could quickly see you fall into debt with your energy supplier.
It’s also really handy to know how much you actually use so that you’re more capable of switching suppliers once your contract is up.
And you also need to be aware of what type of gas meter you have, to ensure you’re being charged correctly. If you're considering an energy switch, it’s always good to know what types of meters you have and let your supplier know.
Below are illustrations and examples of gas meter types. This will help you better identify your own meter at home. It will be either an imperial or a metric gas meter.
If your meter is an old imperial gas meter, which will measure gas in cubic feet, it will have the words "cubic feet" or the letters ft3 shown on the front of the meter.
If your meter is a newer metric meter, which measures gas in cubic meters, it will state "cubic meters" or display M3 on the front of the meter.
Electricity consumption is usually shown in kilowatt-hours (kWhs) on your meter and bill, but gas can be referred to as either units on your meter, or kilowatt-hours on your bill. If you’re unaware of this, it can lead to confusion.
To help you better understand your gas usage in relation to how much you're being charged, the gas meter reading calculator at the top of the page works out the gas coversion in units to kWh. All you have to do is include whether you have an imperial or metric meter and how many units you've used. The calculator will do the rest of the work for you!
Once you have recorded your meter readings, check your last bill and see what the estimated reading was. If the true number is smaller than the estimate, then you have been overpaying. In this case, you’re entitled to a refund from your gas company, and it’s worth checking out How to get a refund from your energy company.
If you have been underpaying then the sooner you contact your supplier the better. You will need to increase your Direct Debit payments or pay it off in one go if it is a small amount, but the quicker you contact the supplier, the less debt you will accumulate. Once you've paid off what you owe, you can search for a cheaper supplier.
If you are closing your account with your current supplier, you will need to send them an accurate meter reading. You’ll also need to submit readings to your new supplier to make sure your new bills are accurate.
The suppliers often have a dedicated phone line you can call to provide your own meter readings. This number should appear clearly on your bill. Some companies will automatically send you a fresh bill based on your reading.
The volume correction factor is used to take into account the temperature, pressure and atmospheric conditions at a property. This factor is typically 1.02264 unless your household has unusual atmospheric conditions. You can usually find this number on your gas bill.
A calorific value (CV) is a measurement of the amount of energy contained in gas, measured in megajoules per cubic meter (MJ/m cubed).
The CV of the gas at each Local Distribution Zone is continually measured by the National Grid who sends this figure to your gas supplier, who then uses it for their calculations. Typically, a gas supply has a CV between 37.5 and 43.0 MJ/m cubed. You can use 40.0 as a default number if you don’t have the exact figure.