The correction factor is an adjustment made for the effect of temperature and atmospheric pressure. All gas suppliers make this adjustment to metered gas volume in accordance with the Gas (Calculation of Thermal Energy) Regulations 1996. The following link provides more information of the correction factor and wider advice on how to work out your gas bill. How to work out your gas bills. For the more mathematically minded, the following academic equations give very detailed information on how the actual correction factor figure is calculated. Correction factor.
