DAX code
Project Completion % =
VAR CompletedTasks = CALCULATE(COUNTROWS('Tasks'), 'Tasks'[Status] = "Complete")
RETURN
DIVIDE(CompletedTasks, COUNTROWS('Tasks'))
Expresses completed tasks as a percentage of all tasks in the current project filter context.
Type your table and column names once. Every measure below updates.
Project Completion % =
VAR CompletedTasks = CALCULATE(COUNTROWS('Tasks'), 'Tasks'[Status] = "Complete")
RETURN
DIVIDE(CompletedTasks, COUNTROWS('Tasks'))
Replace 'Tasks'[Status] with your own status column and completed-status value.
Browse all 175 measures in the Power BI DAX Measures Library, or search the library for something similar to Project Completion %.