This in-class training targets sustainability professionals willing to account and report Product Carbon Footprints of their companies. It covers concepts such as life cycle, Land Use Change, biogenic carbon cycle, as well as the differents standards available for doing so, like PAS 2050 and those from GHG Protocol and Carbon Trust. Case studies and examples on how to calculate a Carbon Footprint are given, along with a discussion on the most recommended softwares for supporting this type of initiative.