Given the greenhouse effects that deteriorate the climate change problem, the carbon oxide (CO2) emission reduction is becoming an important future environmental issue in Taiwan. As energy generates the most part of greenhouse effects, its consumption becomes the main target of energy saving and carbon reduction. Campus plays a role of rudimentary rings in the whole energy saving and carbon reduction policy due to its function for the place of students’ learning and livings. Regarding to the lighting and air conditioning equipment, this study constructs a functional calculator with carbon inventory systems and economic analysis for the use of energy saving and carbon reduction in campus. The constructed systems embodies various functions such as connecting the data-based systems of market lighting and air conditioning equipment, estimating the current status of energy and carbon reduction, and analyzing the feasibility of improving alternatives.