Edit action available: % complete
The % complete fields contain the current status of a task, express as the percentage of the task's duration that has been completed. The % complete can be enter or can be calculated based on actual duration.
% complete= (Actual Duration/Duration)*100
If the % complete field is set to a value greater than zero, the Actual Start fields is set to the Scheduled start date if the actual start date not yet entered. If the % complete field is set to 100, the Actual Finish is set to the scheduled finish date.
If the % complete value is typed the Actual duration and remaining duration will be automated calculated.
By default, changes to a task's % complete value affect the actual work value.
% complete indicate the status of the duration of the task, % work complete shows the amount of work completed on the task so far.
When a task is first created, the timephased %complete is zero, As soon as you enter % complete the actual duration, remaining duration or actual work is calculated by formula:
% complete=(Actual Duration/Duration)*100
This total % complete is then divided and distributed across the duration complete.