Abstract: A real-time, mobile, energy savings and cost estimation tool may be provided. The energy savings and cost estimation tool may be implemented on a mobile electronic device, such as, but not limited to a laptop computer, tablet, or a smart phone, for example. A user may create a project and define project information using the energy savings and cost estimation tool while at the project site. For example, the user may discuss the project with a potential customer, ask questions about the project to be created or retrofitted, walk around the project site, and enter the project information into the energy savings and cost estimation tool. Using the project information gathered, the energy savings and cost estimation tool may provide real-time feedback, such as an energy usage audit, an energy usage solution design, an energy analysis, and/or a return on investment (ROI) analysis for the project, to the user.