# Gas cost calculator

Given two gas meter readings, e.g. 6789 and 6913, what is the formula for calculating the cost of the gas used (using typical UK gas price)?
MM
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On Tue, 06 Jan 2004 09:42:47 +0000, Mike Mitchell

Refer to your supplier and ask for their tariff figures or look at your last bill. The meter may be measuring in cubic metres or in deprecated cubic feet. You can then work out the amount of heat in kW.h using the conversion that they give and add in any factors such as standing charges. You pay by the kW.h
Some suppliers charge different prices for the first N kWh
.andy
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"Mike Mitchell" wrote | Given two gas meter readings, e.g. 6789 and 6913, what is the formula | for calculating the cost of the gas used (using typical UK gas price)?
On the back of the gas bill
Gas units used multiply by imperial to metric conversion factor of 2.83 multiply by volume conversion factor of 1.022640 multiply by calorific value of 40.1 (Megajoules per cubic metre) divide by kilowatt hour conversion factor of 3.6 = kilowatt hours used
124 units x 2.83 = 350.92 x 1.022640 = 356.86 x 40.1 = 14390.47 / 3.6 = 3997 kWh
@ 2.659 p/kWh = GBP106.29 + VAT of 5% = 5.31
Note that some of the factors (esp the calorific value) may vary from time to time and place to place.
Owain
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On Wed, 7 Jan 2004 15:14:36 -0000, "Owain"

Thanks, Owain!
MM
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