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March 7, 2023
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Would anyone kindly help with converting a very old imperial meter reading to kwh please?

  • March 7, 2023
  • 75 replies
  • 3809 views

Hello, I have a very old imperial meter made by Parkinson Cowan (Ser/ No S512290) that works in ft2. Would someone kindly help with the conversion to kwh please. I also would like to know if it measures in ft2 or 100ft2. This is an image, many thanks.

 

Best answer by BPLightlog

Updated on 20/07/26 by Ben_OVO

Ok so it’s measuring in cubic feet (ft3) the reading on the dial is 4974 (ignore the Red figure) and the calculations are like this (posted on your bill)

So the extra piece to understand is the x 2.83 along with the others to get kWh. 
If the previous reading was 4874 for example the difference is 100 so the calculation would be:

100 x 2.83 x calorific value (typically 39) x 1.02264

The result is then divided by 3.6 to get kwh

Remember that the calorific value varies so that figure can change (and does).

 

The calculation above is shown on your monthly statements, which can be viewed on your app and online account by following the guide below:

 

 

If you’ve got an imperial gas meter then it may be old, and may have reached the end of it’s certification. We’d recommend upgrading to a smart meter free of charge. Smart meters send reads to us automatically so you don’t have to, meaning your bills won’t be to estimated readings. You can find out more, and book an appointment, here.

 

 

75 replies

Newcomer
September 12, 2025

While the last estimation made from them  is  :

14.6990 Estimated reading

5 Sep 2025

244.0000 Customer reading

 

 

Consumption

229.3010 Units (100s of

f3

Firedog
Super User
Super User
September 12, 2025

… my first ever reading sent to EDF was 9424 on Feb 2023---
  

Now we’re getting somewhere!  That was a long time ago, but we can now assume that the meter reached 9999 sometime after you moved in, started again at 0000 and has now reached 0244. Over those 2½ years, then, you seem to have used 820 units of gas, or perhaps 27 per month on average. 

27 x 2.83 = 76 m³ which equates to something of the order of 850 kWh, probably £50 or £60 each month on average, plus, of course, the standing charge of around £9 a month. If this is very different from the amounts you’ve been paying, you’re either in for a nice windfall or a major shock to the wallet. I’m afraid that with the latest estimated reading you showed above being so much lower than the actual one, you may be presented with a big bill. If it’s too big to manage, your supplier will make it easier for you by giving you time to pay, so call them when you get the bill. 

Noel | I have no official status; I'm just a volunteer who comes here to help other customers. My gear: Aclara SGM 1416-B Electricity-only E7 meter; Chameleon IHD3-PPMID-AAA | It may look as if I know what I’m talking about, but don’t let that fool you. |
Newcomer
September 13, 2025

So i have been paying 60£ direct debit every single month for the past yeras for both energy snd gas! But once in three month EDF would sent me a gas bill usually for over 150£ which has been paid too! 
Now when i decided to give this metter reading they did sent me a 700£ debit! 
 

The reason why i was sceptic about is the fact that it is too much  and smth seems off because i have already paying and it still is to high debit after the redading! 

i have raised a complain to them but for the fact that i believe they mis calculate it...now i am lost ahha! Thank you very much for the explain! 
 

Nukecad
Super User
Super User
September 13, 2025

I would also be pushing EDF to fit a new gas meter, the one in your image has a date of 1990 on it so it’s 35 years old.

(They may be reluctant to change it though, some gas meters could be certified for 40 years).

I said, Hey - Watts going on.
Newcomer
March 23, 2026

Can someone explain please- this gas metter reads in Single ft cubic or 100s of cubic feet?! 
 

I decided to give this metter reading to my gas company and they have treated it as : 

14.6990 Estimated reading

244.0000 Customer reading

229.3010 Units (100s of ft cubic) 

 

and this jumps my bill to 700£ debit even though I have paid gas regularly ! 
 

From gov website not all the imperial gas measure in 100s of ft cubic) but EDF wont agree! 
 When turn it into cubic meters they calculate it by 2.83 instead of 0.0283 ! 
 

Am i wrong? Can anyone help? Thnx

Personally I don’t think you are wrong, I’m having the exact same issue with EDF with the exact same meter and the exact same conclusion of being overcharged, mine states .071ft3/rev just like yours, I have watched the proving clock, mine flicks over the red digit in 10 revolutions, should be just over 14 revolutions, so I have concluded that the rotating red digit is relative to the .071ft3/rev on the face plate, EDF requires the 4 black dial digits, as you said, there billing formulas as well as being stated on the bill, seems to consider the digit to the immediate left of the red dial as (100s of ft3), I have it in an email and EDF still say it is the correct multiplier x2.83, i personally think it should be (units) x 0.283 not (units) x 2.83 as that is for calculating HCf - cubic meter. Have you had any further developments as any help would be appreciated as I’m still fighting, mine started around 2022 aswell, send me an email and I’ve got screenshots of their online system changing it immediately after I sent a reading and by morning it has been deleted and reversed charges are taken off a much higher figure 

Newcomer
March 23, 2026

These photos were taken immediately after sending a meter reading, reversing charges till the balance was £1067 in credit

 

Newcomer
March 23, 2026

So i have been paying 60£ direct debit every single month for the past yeras for both energy snd gas! But once in three month EDF would sent me a gas bill usually for over 150£ which has been paid too! 
Now when i decided to give this metter reading they did sent me a 700£ debit! 
 

The reason why i was sceptic about is the fact that it is too much  and smth seems off because i have already paying and it still is to high debit after the redading! 

i have raised a complain to them but for the fact that i believe they mis calculate it...now i am lost ahha! Thank you very much for the explain! 
 

2 hours later in this instance, all the information has changed shown here with the exact same dates and reversed charges except they are taken off a much higher initial balance that just shows up out of fresh air, I am convinced that there is something wrong and all I get in the complaint department is we’ve checked the billing and it’s correct 

 

Newcomer
March 24, 2026

So my old Parkinson Cowan meter reads in Ft3, the proving wheel rotates 10x to increment the red digit so the red digit is proving relatively accurate (accounting for mechanical flick over in the gearing)to the.071ft3/rev on the face plate, (should be just over 14 revolutions) but that’s not the argument, what is the argument is why the black digit immediately left off the 1ft3 red digit is considered 100ft3, not 10ft3 when a full 0-0 rotation of the red digit increments the black dial 1, Any help will be appreciated 

Firedog
Super User
Super User
March 24, 2026

… EDF requires the 4 black dial digits, as you said, there billing formulas as well as being stated on the bill, seems to consider the digit to the immediate left of the red dial as (100s of ft3), I have it in an email and EDF still say it is the correct multiplier x2.83, i personally think it should be (units) x 0.283 not (units) x 2.83 as that is for calculating HCf - cubic meter. 
   

This image is from the official government guidelines about gas meter readings:
  


The ‘4 black dial digits’ you mention give the reading in hundreds of cubic feet, and you can just ignore the other figures.

100 ft³ = 2.83 m³, so that is the multiplier to be used when calculating the volume used to convert to kWh. ​​​

Noel | I have no official status; I'm just a volunteer who comes here to help other customers. My gear: Aclara SGM 1416-B Electricity-only E7 meter; Chameleon IHD3-PPMID-AAA | It may look as if I know what I’m talking about, but don’t let that fool you. |
Newcomer
March 24, 2026

… EDF requires the 4 black dial digits, as you said, there billing formulas as well as being stated on the bill, seems to consider the digit to the immediate left of the red dial as (100s of ft3), I have it in an email and EDF still say it is the correct multiplier x2.83, i personally think it should be (units) x 0.283 not (units) x 2.83 as that is for calculating HCf - cubic meter. 
   

This image is from the official government guidelines about gas meter readings:
  


The ‘4 black dial digits’ you mention give the reading in hundreds of cubic feet, and you can just ignore the other figures.

100 ft³ = 2.83 m³, so that is the multiplier to be used when calculating the volume used to convert to kWh. ​​​

@Firedog  but why is the each unit of the black dial charged as the 10s if the red dial is the single ft3 which does increment relative to the proving wheel which is correlated to the.071ft3/rev on the face plate