ABSTRACT
Several websites have emerged to assist organizations in estimating their energy and GHG or carbon footprints. These websites typically utilize a calculator format that requires input from the user, performs calculations based on the entered data, and then provides output of the estimated annual energy and GHG emissions. Several sites offer recommendations and strategies to reduce emissions. Similarities and differences exist among the calculators, and signi’cant differences may exist in their output. Major categories of differences and similarities among the calculators include:
• The calculator developer (government, nonpro’t, or private company) • Market served (home, commercial, manufacturing) • Fee for usage • Support provided • Calculation method
The remaining sections provide a description of each calculator, including the website address, fees, and calculation methods. Table 7.1 provides a summary and compilation of these calculators.
