What do I do when a gas meter dial is between 9 and 0?

The reason is mechanical. The pointer has not yet completed its turn to 0, so 0 would record a figure the dial has not reached. Writing 9 records the last number the pointer passed. The same logic runs through every dial: when a pointer rests between two numbers, you always write down the lower number, which is not necessarily the nearest one to the pointer².

Reading a dial meter takes about a minute once you know the sequence. Work from left to right, read only the four main dials, ignore the large dial and any red dials, and check the dial to the right before you finalise any number a pointer appears to sit on¹. The sections below set out the rule, the step-by-step method, and what the reading feeds into.

What the dials on a gas meter show

A gas dial meter has four or more dials, each turning to point to a number between 0 and 9¹. An electricity dial meter has five or more, so the gas version is the shorter of the two⁵. The dials sit next to each other and alternate direction: one turns clockwise, the next anticlockwise, and so on along the row. That alternation is why a reading taken by eye can look wrong when it is right, and why the pointers appear to move in opposite directions as gas is used.

Dial meters are the imperial generation of gas meter. They measure gas usage in cubic feet (ft³), not cubic metres³. Imperial gas meters, which include dial meters and some analogue meters, show readings in cubic feet and have four numbers to read⁶. Newer meters are metric, show readings in cubic metres (m³) and have five numbers to read⁶. If your meter has a row of small clock faces rather than a digital display, it is almost certainly imperial, and the four-digit reading is what your supplier wants.

The dials themselves are a display, not the metering mechanism. Gas meters approved under UK law must be within 2% accurate, and electricity meters within +2.5% and -3.5%⁴. The accuracy requirement sits with the meter, so the job of the householder is simply to transcribe what the dials show without introducing an error at the point of reading. That is where the nine-to-zero rule earns its place: it is the transcription rule that stops a correct meter producing an incorrect bill.

The nine-to-zero rule: when the pointer sits between 9 and 0, write 9

If the number is between 9 and 0, use 9². That is the rule in full. It applies on a gas dial meter and on an electricity dial meter alike, and it is the same instruction whether the pointer is a hair past the 9 or almost touching the 0.

The wider rule it belongs to is this: when the pointer is between two numbers, always write down the lower number, which is not necessarily the nearest number to the pointer². Between 3 and 4, you write 3. Between 9 and 0, the lower number in the sequence is 9, because the dial runs 0 through 9 and the pointer is still completing the 9. Writing 0 would jump the dial forward to a figure it has not reached.

There is a second check that catches the same problem from the other direction. Look at the next dial to the right: if it shows a high number, 8 or 9, the pointer has not passed the digit it hovers above; if it shows a low number, 0 or 1, it has⁷. So a pointer that appears to sit exactly on 5, with the next dial showing 9, has not actually reached 5, and the number to record is 4. Some guides express this as reducing the previous number by one when the next dial along is on 9⁸. Others describe underlining a number the pointer points straight at, then taking one away from an underlined number if it is followed by a 9⁹.

The two formulations, write 9 when between 9 and 0, and reduce the previous digit when the next dial is on 9, are the same correction applied at different points in the row. Applying both is not double-counting: the first governs the dial you are looking at, the second governs the dial to its left.

How to read a dial meter step by step

The sequence below follows the published guidance for dial meters, which is consistent across consumer bodies, energy advice services and suppliers¹.

1. Read the dials from left to right².
2. Read only the four main dials. You might see four or more dials, but you only need to read the four main ones⁸.
3. Ignore the large dial and the red dials². Dials without numbers or hands should be disregarded¹⁰.
4. For each dial, write down the number the pointer has just gone past⁷.
5. If the pointer is between two numbers, write the lower number².
6. If the pointer is between 9 and 0, write 9².
7. If a pointer sits directly over a number, check the next dial to the right: a high number there (8 or 9) means the pointer has not passed it, so reduce by one; a low number (0 or 1) means it has⁷.
8. Write the four digits in order as your reading.

A worked example makes the last step concrete. One published dial meter reading is 7120⁷. Another example page gives 9476². In a third case, the dials appear to show 15659, but the actual reading is 15649, because the fourth dial pointer is pointing at 5 while the next dial is between 9 and 0⁵. That is the rule doing its work: the apparent 5 becomes a 4, and the reading drops by one digit in the fourth position.

Which dials to ignore, and why the count differs

Read the first four dials from left to right and ignore the large dials or red dials¹. The red dials and any marked 1/10 or 1/100 show fractions of a unit, and suppliers bill on whole units, so including them would produce a reading that does not match the meter's own register. On a digital metric gas meter the same principle applies: ignore the numbers after the decimal point, sometimes shown in red¹.

The count differs between fuels. Electric has five digits to read, and gas has four⁶. That is why a gas dial meter reading is four digits and an electricity dial meter reading is five, and why a reading copied from one to the other will be rejected. On a digital display, for both gas and electricity you usually use the first five digits from the left¹⁰, but on a gas dial meter the four main dials are the whole reading.

If your meter is not a dial meter, the method changes but the left-to-right order does not. A digital metric gas meter reading is the five numbers from left to right, including the zeros, but not the numbers in red or any numbers after the decimal point³. A digital imperial gas meter reading is the first four numbers from left to right, ignoring the rest of the numbers shown in red¹. A digital gas meter reading is the numbers from left to right, including all zeros but ignoring the red numbers or any number after a decimal point¹¹. Standard gas meters need the first four or five numbers¹⁰.

Smart gas meters remove the dials altogether. On a smart gas meter with a button to the left and right of the screen, press either button and wait until you see '01' with numbers followed by 'M3'¹². On a keypad model, press 9 and you will see 'VOLUME' on the screen, which then changes to numbers followed by 'M3'¹². A Secure smart gas meter works the same way: press number nine on the keypad, the word 'volume' appears followed by the gas reading in cubic metres, and you take the first five digits¹³. For meter readings, the reading will be a number followed by 'm3'³.

Why the nine-to-zero rule matters for your bill

A reading that is one digit out in one position is not a rounding error. It is a whole unit of gas, and on a dial meter that unit is a cubic foot. Get the nine-to-zero rule wrong and you either understate your usage, which leads to a catch-up bill later, or overstate it, which means paying now for gas you have not used. Neither is a billing dispute you want to open over a transcription mistake.

The scale of the underlying problem is visible in supplier performance data. Bills accuracy on traditional meters stood at 91.0% for British Gas in January to March 2026¹⁴. That figure covers billing accuracy generally rather than meter reading specifically, but it shows that roughly one bill in ten on traditional meters is not accurate, and a misread dial is one route into that group.

The reading also feeds the wider question of what a household pays per unit. The electricity-to-gas price ratio is a live policy question, with a recommendation that the UK government should act to reduce the ratio to 2.9 or below¹⁵. That ratio is calculated from unit prices, and unit prices are applied to the units your meter records. An accurate reading is the input to every downstream figure.

There is a separate check worth knowing if you suspect the meter on your bill is not yours. In Wales, you can find out if the gas meter on your bill is correct by comparing the Meter Point Reference Number (MPRN) on your bill with the MPRN registered to your address, and contacting your gas supplier if they do not match¹⁶. The MPRN is the identifier assigned to the gas meter at your property and typically ranges from six to ten digits¹⁷, or between six and 11 digits according to other guidance¹⁸. If a reading looks persistently wrong, the MPRN is the first thing to verify.

If a pointer seems stuck, or the reading will not move

A pointer resting between two numbers is normal and is exactly what the rule covers: record the lower number². A pointer that appears genuinely stuck, or a reading that does not change between checks, is a different matter. For gas meter issues, call your gas supplier, whose number can be found at the top of your energy bill¹⁹. Suppliers handle meter faults, exchanges and accuracy disputes, and there is a separate route for reporting a meter you believe is faulty²¹.

If you can smell gas, that is not a meter-reading question. If you can already smell gas and think there could be a leak, call the National Gas Emergency Service immediately on 0800 111 999 at any time²². The same number applies if you smell gas, experience low gas pressure or suspect carbon monoxide²³. Do not wait to finish a reading, and do not use a phone inside the property if you suspect a leak.

For everything else, the reading itself is the householder's job, and it is the point at which a household has the most direct control over what it pays. A dial meter does not report to a supplier on its own, and it does not depend on a signal, an app or a cloud service. The dependence runs the other way: the supplier depends on you to transcribe the dials correctly. That is a small piece of energy independence, and the nine-to-zero rule is the part of it most often lost.