User ratings
5 star:
4 star:
3 star:
2 star:
1 star:
3 ratings
Average user rating:
4.3 stars
Comment from: Clive Purmah [Visitor]  
Clive Purmah
5 stars


An hour on the phone to BG to get this answer but the adviser stil couldn’t tell me!

All I wanted to know was how they calculated how many kwh’s were charged in tier 1 and how many in Tier 2.. It’s different on every statement and now I know why.

Many thanks, however,do you have any idea how to calculate how many kwh’s I will be charged for in each for tier for electric. This formula doesn’t appear to work but I have Economy 7…. 2 Tiers and a night reading!!



22/03/11 @ 22:42
Comment from: [Member]
Value hunter

I’ve not forgotten about your request Clive, I have the formula used to calculate electricity prices, I’ll try and get it posted this evening

28/03/11 @ 14:07
Comment from: Jakub [Visitor]  
5 stars

Could you explain step 2?

I don’t get, why the conversion is 2.83. According to this page ( and my knowledge feet is a smaller than meter, so it should be 0.0283.

Gets me really confused.

03/11/12 @ 18:33
Comment from: [Member]
Value hunter

Hi Jakub,

This direct from British Gas, this is the standard calculations template, a copy of which I received after numerous requests and comes from, I believe, British gas’ back office and is used by British gas’ billing staff.

“If the customer has a 4 dial (imperial) meter, you need to convert the imperial units (HCF) to metric units (M3).

If the customer has a metric meter you can leave this step out and move straight onto Step 3.

Imperial units (HCF) x 2.83 = Metric units (M3)”

Took a while to find the original message, but got there in the end. Hope this helps

04/11/12 @ 02:29
Comment from: Pete [Visitor]
3 stars

GOOD, except step2

1ft³ = 0.028316846m³

check on the following website:


07/11/12 @ 10:38
Comment from: [Member]
Value hunter

Thanks for that, just waiting for British Gas to get back to me to confirm…
Hope this doesn’t open a can of worms!

07/11/12 @ 15:20
Comment from: [Member]
Value hunter

Confirmation from British Gas;

“Yes we multiply the number of units used (in hundreds of cubic feet) by 2.83″

So the formula I posted here is used and accurate for British gas billing…

07/11/12 @ 17:14
Comment from: djidji [Visitor]

hi,my friends.Shall I ask you to help me.I can’t calculate my gas bill,if somebody help me I would be grateful.Mu current gas meter is 00822 m3…I wanna help,please.Thank you

02/04/14 @ 14:39
Comment from: B.wilson [Visitor]

Very good.
What about the electricity calculation?

30/11/15 @ 14:20
« The Financial Ombudsman Service is a failure!Car insurance firms passing on details of people involved in crashes to claims companies »