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• FIRST POST
Smithmeister
Hi all,

I'm looking for a really easy way of working out my yearly gas consumption so i can compare my gas and electricity bill.
I am currently with ScottishPower on their capped rate which ends this month.
My Electricity consumption for the year is 5267 units and my gas is 629 units. So as far as ican see my electricity consumption is pretty straight forward but the gas is perplexing me slightly!

Any help and advice is greatly appreciated.

Smithmeister
Page 1
• withabix
• By withabix 1st Apr 08, 9:47 PM
• 8,959 Posts
• 7,908 Thanks
withabix
2. Gas (kWh) - this is measured in units on your meter but paid for by kilowatt hour (kWh). To calculate how many kilowatt hours of gas you have used in each bill, take the number of gas units used (if you have an imperial meter, multiply the figure by 2.83), now multiply the gas units used by the calorific value (39.7) and the correction factor (1.022640), and then divide by 3.6.

In your case:

kWh = 629 x 39.7 x 1.022640/3.6 = 7093.51kWh (if metric meter)

x 2.83 if imperial
Last edited by withabix; 01-04-2008 at 9:57 PM. Reason: corrected for imperial/metric
British Ex-pat in British Columbia!
• Cardew
• By Cardew 1st Apr 08, 9:52 PM
• 27,326 Posts
• 13,376 Thanks
Cardew
There are 2 types of gas meter - Imperial and Metric

Imperial(the older type) measures in cubic feet. 1 unit is 100 cubic feet and approx 31kWh.*

Metric measures in cubic metres and 1 unit is approx 11.1kWh.

So you have used either 19,500kWh or 7,000kWh so you probably have an Imperial meter.

* can vary slightly depending on calorific value.
• withabix
• By withabix 1st Apr 08, 9:55 PM
• 8,959 Posts
• 7,908 Thanks
withabix
There are 2 types of gas meter - Imperial and Metric

Imperial(the older type) measures in cubic feet. 1 unit is 100 cubic feet and approx 31kWh.*

Metric measures in cubic metres and 1 unit is approx 11.1kWh.

So you have used either 19,500kWh or 7,000kWh so you probably have an Imperial meter.

* can vary slightly depending on calorific value.
Originally posted by Cardew

You could be right.

My gas and electricity consumption over a year are approx equal in kWh however (well, certainly of similar magnitude anyway).
British Ex-pat in British Columbia!
• Smithmeister
Daft question
How do i know if i've got an Imperial or Metric?
It's a huge difference!!
• Cardew
• By Cardew 1st Apr 08, 10:35 PM
• 27,326 Posts
• 13,376 Thanks
Cardew
Daft question
How do i know if i've got an Imperial or Metric?
It's a huge difference!!
Originally posted by Smithmeister
Look at the meter and it will say "cu ft" for an Imperial or M3(metres cubed) for metric.

This is normally in small print at the bottom of the dial.

Also look at your gas bill, if the number of gas units x 31 equals the kWh you are being charged for Imperial.
• Smithmeister
Thanks Cardew,

Had a quick gander there and my meter has got FT3 so i assume that that is imperial as it is closer to cuft than M3?
• Smithmeister
have had a look at my last bill and it reads:
Description Domestic Capped Start 9083 End 11 Units 208 Price(kwh@p) 6655@2.136 = !!!163;142.15 Standing charge 82 days @9.990 = !!!163;8.19 Total !!!163;150.34.

Maybe this will make it easier.

Cheers
Last edited by Smithmeister; 01-04-2008 at 10:53 PM. Reason: Wrong image
• Cardew
• By Cardew 1st Apr 08, 10:57 PM
• 27,326 Posts
• 13,376 Thanks
Cardew
Yes it is Imperial. FT3 is Feet cubed!

On your latest bill 1 unit equals almost 32kWh.

So in the comparison site enter 20,000kWh
• Smithmeister
Appreciate your help Cardew.
Imagine not getting cubic foot from FT3,what a numpty!
• si_pritch
I'm a little confused.

I am trying to work out if our gas pre payment meter is overcharging us. According to my meter, I have used 41106 units in a given period, at a cost of £20. (it's in metric)

How do I work out how much that is in KWh and then how much each KWh has cost me, so that I can compare this to the quoted prices on British Gas' website?

I have a feeling something is not quite right here, especially since the originator of this post used 600 odd units in a year!

Thanks in advance - having lurked here for a little while, I know that reponses are always helpful and informative!!

• Magentasue
I'm a little confused.

I am trying to work out if our gas pre payment meter is overcharging us. According to my meter, I have used 41106 units in a given period, at a cost of £20. (it's in metric)

How do I work out how much that is in KWh and then how much each KWh has cost me, so that I can compare this to the quoted prices on British Gas' website?

I have a feeling something is not quite right here, especially since the originator of this post used 600 odd units in a year!

Thanks in advance - having lurked here for a little while, I know that reponses are always helpful and informative!!

Originally posted by si_pritch
Where did you get 41106 from? I suspect it's from your statement - this isn't meter units, it's been converted into kwh.

£20 for 41106kwh = about 4.8p per kwh.
• si_pritch
Thanks for getting back to me so quick.

I'm on a prepayment card, so never get a bill. I use a top up type card, put money on it at a shop, then put the card into the box next to the meter to use gas.

Reading taken when no credit on machine at start - 2715037
Reading taken when no credit on machine at end - 2756143

So, I get 41106 unit used.

Does this seem a little excessive, especially if I tell you we have had the heating on for 3 hours a day, plus hot water and cooking - start reading was taken 30/12/08, end reading taken 03/01/09.

And no, we don't eat like pigs, or use lots of hot water!

thanks in advance again!
Last edited by si_pritch; 04-01-2009 at 9:00 PM. Reason: Put the numbers in the wrong way around!!
• Magentasue
Ah, I have no experience of prepay - not unless you count when I was a child and we fed it shillings.

I'm now thinking that you are reading too many digits on the display - are some red or different in some way?
• si_pritch
Nope - all the number look exactly the same, with no divider / points in between - on a digital readout.
• kat1982
imperial meters have four dials in the black, metric have five
• si_pritch
It's a digital meter display, so there are no dials at all.
• Magentasue
In that case, I think you only use the first four digits which makes yours 41 for four days.

Imperial = approx 41 x 31 = 1271
Metric = approx 41 x 11 = 451

So metric = 451kwh for £20

I think that makes sense.
• Cardew
• By Cardew 4th Jan 09, 9:42 PM
• 27,326 Posts
• 13,376 Thanks
Cardew
Thanks for getting back to me so quick.

I'm on a prepayment card, so never get a bill. I use a top up type card, put money on it at a shop, then put the card into the box next to the meter to use gas.

Reading taken when no credit on machine at start - 2715037
Reading taken when no credit on machine at end - 2756143

So, I get 41106 unit used.

Does this seem a little excessive, especially if I tell you we have had the heating on for 3 hours a day, plus hot water and cooking - start reading was taken 30/12/08, end reading taken 03/01/09.
Originally posted by si_pritch
41106 gas units used would cost about £18,000.00

I suggest the last 3 digits are decimal places(are they in red?) so you have used 41.106 gas units which is approx 460kWh.

If you are paying 4p/kWh that is approx £18.40
• Magentasue
Or, taking what kat said, maybe the first five digits, which would make it 411kwh over four days.
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