This tool is based on the whole carbon footprint methodology described in 'What Colour is Your Building?'. It allows you to quickly identify the contribution of operating energy, embodied carbon and commuting transport emissions to the whole carbon footprint of an office building. User data can be entered or default values can be used. Appendix G, an electronic appendix to the book, provides an overview of how the tool works. It can be downloaded from www.whatcolourisyourbuilding.com.
If you have any comments on how the tool can be improved please contact David Clark.