A formula to forecast the likelihood of a project to achieve its goals based on what’s happening in the project right now. There are two different flavors for the TCPI, depending on what you want to accomplish. If you want to see if your project can meet the budget at completion, you’ll use this formula: TCPI = (BAC – EV)/(BAC – AC). If you want to see if your project can meet the newly created estimate at completion, you’ll use this version of the formula: TCPI = (BAC – EV)/(EAC – AC).