So... Which Calculator?

Right, so I have 4 different figures for the amount of carbon we, as a family, produce.
The Climate Friendly calculator did not include for waste production and type of diet so it was always going to come up shorter than the rest. There was really nothing to choose from with the other three. They all used the same or similar variables as the base for their calculations and came up with different figures but as the carbon offset industry is unregulated this isn't really a surprise.
So, I'm going to use the carbon neutral calculator because it was nice and simple to use, and it had the added feature of including public transport as a factor, which will become a feature in our carbon footprint in the next few months. The site also provides a figure of 28 tonnes as being the average amount of carbon produced by a single Australian in a year.