What is the formula to change Cubic feet into KwH

*abcd/e*

Where *a* is consumption in cubic feet

*b* is 2.83 (to convert to cubic metres)

*c* is the volume correction factor (normally 1.02264)

*d* is calorific value (variable, normally between 37.5 and 43)

*e* is kWh conversion factor (3.6)