Working out gas cost

melbury

I know this sounds totally thick, but is there any easier way of working out kilowatt hours for gas other than the long complicated sum on the back of the bill?


Thanks.

espresso

Use this online calculator to convert to kWh and this one to work out the cost.

Cardew

melbury wrote:

I know this sounds totally thick, but is there any easier way of working out kilowatt hours for gas other than the long complicated sum on the back of the bill?


Thanks.

Multiply units by 11.5 for a Metric meter, and 32.5 for an Imperial meter gives an approximation of kWh.

The calorific value doesn't change a huge amount.

elektra

Thought I would put above to the test using a bill from BG in March this year

BG converts 185 units to 5799 KWh

using the energylinx online calculator quoted above 5949

using last approx method 185 x 11.5 = 2070

both quite a difference - I prefer the BG way !

f107btx

elektra wrote:

Thought I would put above to the test using a bill from BG in March this year

BG converts 185 units to 5799 KWh

using the energylinx online calculator quoted above 5949

using last approx method 185 x 11.5 = 2070

both quite a difference - I prefer the BG way !

It seems you have an imperial meter multiply by 1.02264*Calorific value (39)*2.83/3.6=5800 kwhs

elektra

f107btx wrote:

It seems you have an imperial meter multiply by 1.02264*Calorific value (39)*2.83/3.6=5800 kwhs

Yes, that is the calculation used by BG. I assumed it was metric as it is digitial and 9 years old but just checked it and it measures in cubic feet

Seems in the example I quoted above I did one as metric and the other imperial.

Either way using 32.5 x units or energylinx gives a higher estimate due to calorific value so best to check bills which should show the way supllier works it out

Cardew

elektra wrote:

Either way using 32.5 x units or energylinx gives a higher estimate due to calorific value so best to check bills which should show the way supllier works it out

If you have a vairiable(i.e. calorific value) in a calculation it is obviously best to use the method shown by the supplier to get the exact result.

The OP asked for a simple method and the 32.5/11.5, as stated, simply give an approx value and at the moment for your example it is 3.6% inaccurate.

Before they get their detailed bill most people simply want a rough idea of how much they have used.