Why is my footprint different depending on the way I have entered my bill information (i.e. cost of energy bills in monthly, quarterly or yearly format)?
If you enter cost information, the calculator uses an average cost per kWh for each fuel to work back to kWh of fuel used for the calculation. If you enter information on a quarterly basis, the calculator uses average factors for the differences between each seasonal bill to work out an annual total. If you enter your monthly direct debit figures, the calculator assumes this was constant during the year and multiplies them by 12 to get annual cost. If any of these assumptions differ from your circumstances, the annual kWh figure fed into the calculation may differ from the actual. If you can find the actual annual total kWh figure for each fuel/energy source, this will give the most accurate calculated carbon footprint.
