How to convert gas meter readings units (M3) into kWh

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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, can’t be sure you’re getting billed correctly.

Most energy suppliers will estimate your energy usage, but if you regularly take accurate gas meter readings, you’re more likely to pay for the energy you actually used, rather than for your suppliers’ best guess.

Gas units to kWh converter

What type of meter have you got?

Number of units used:

Your gas usage in kWh:

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 above, 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.

If you need any further help reading your gas meter, take a look at our Gas and electricity meter readings page.

Why do you need to take a gas meter reading?

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 switching suppliers, it’s always wise to let them know which type you have, to help with costing, accuracy and it’s generally just good to know.

What are the different types of gas meter?

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.

Imperial gas meters

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.
imperial gas meter

Metric gas meters

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.
metric gas meter

How gas readings differ from electricity readings

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 unit to kWh conversion. 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!

What to do with your gas meter readings

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.

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