* Resurgence Carbon calculator - based on electricity/gas bills but it includes less common energy sources like wood, propane and butane.
* National Energy Foundation carbon calulator: covers almost everything, with a useful list of conversion factors.
* Carbonlife calculator - very general, based on lifestyle.
* Fuel conversion factors from Defra (last updated June 2005).
* Carbon Rationing Action Groups are small groups of individuals working together to reduce their personal footprint.
* RSA Carbon Limited project has a carbon footprinting capability and allows users to compare footprints with others.
* Energy bench marking tool for commercial buildings.
* CRAG carbon footprinting and accounting with pie and bar charts based on the CRAG model.