How to roughly predict gas bill in advance?

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10 Jul 2007
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I have a diaphragm gas meter which is measured in meters cubed (m3). It has 8 digits,the last 3 of which are in red, example:

99920678

Firstly, what is a unit exactly, the 6 or 7 or 8, or the 0 or 2 in this example?

Secondly, the calculation varies from area to area, but assuming this calculation:

-Multiply by the temperature and pressure figure (1.02264).
-Multiply by colorific value (39.2)
-Divide by 3.6 to get the number of kilowatt hours (kWh)

Assuming 5 units used at 5p per kWh, I get £2.78. Does that sound about right?

I tried doing a search on Google but can only find info on reading a digital meter or converting cubic feet to metres cubed. Thanks. :)
 
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