The document describes the development of a Triple Bottom Line Calculator tool to help cities evaluate capital investments. The tool calculates the economic, environmental, and social benefits of investments in areas like energy efficiency, renewable energy, transportation, and development. By inputting details of a project, the calculator can estimate outcomes such as energy savings, cost-benefit ratios, and payback periods to help cities strategically direct investments and justify decisions. The tool was created through a partnership between several cities to provide a standardized way to assess all types of benefits from capital expenditures.