The Cpi (Cost Performance Index) Pmp Formula is a calculation used to measure the cost-effectiveness of a project or program. It is calculated by dividing the earned value (EV) of a program, project or other investment by the actual cost of that program, project or investment. This number reflects the efficiency and effectiveness of cost management in producing the intended results of an effort. By using this formula to track progress throughout a program or project, organizations can identify areas for improvement, ensure transparency in financial decisions, and provide more accurate estimations for any future programs. Ultimately, this helps organizations maximize their investments and obtain better returns on them.