Hotel CO2 (HotelCO2.com) is a simple and affordable tool designed for hotel managers to apply the Hotel Carbon Measurement Initiative (HCMI). The tool requires no prior knowledge of CO2 reporting and can be used by any hotel regardless of type, class and location. Users can calculate their hotel's carbon footprint in hotelier-friendly metrics.HCMI is groundbreaking initiative to unite hotel industry efforts to calculate and communicate carbon footprints and respond to RFPs. The methodology has been developed in partnership with 23 hotel groups and is already being applied by over 15,000 hotels around the world.