Percent Complete is a field calculated based on Actual Duration and Duration, and it shows how far the project or tasks have progressed. Whether your program uses a % complete method or not depends on whether it's an enterprise application that interfaces with timesheets. If your tool is coupled with a timesheet software, the task's percent complete may automatically increase as your team members log time on it. However, depending on how accurate the team's time tracking is, this may not be the case. Usually, a column on your software's left-hand side of the Gantt chart allows you to insert % manually.