Forum Discussion

Kirk-Anderson's avatar
Kirk-Anderson
Copper Contributor
Apr 10, 2023

Calculate days remaining in a task based on start date and percentage done.

Hi, I've searched for a solution for this but I'm struggling, possibly in part due to brain fog!

I'm part of a big migration project, and I have a formula that works out how far along the project is (C100) and a start date of 6th Feb 2023.

 

The percentage completed figure in C100 fluctuates based on new data coming in and the complexity of the work (it just jumped from 87% to 61%!), so I know it's not going to be accurate, but can someone help with with a formula that works out the number of days remaining until the task is completed based on the start date and the percentage done?

 

Thank you in advance.

excel
Formulas and Functions
  • HansVogelaar's avatar
    HansVogelaar
    Apr 10, 2023

    Kirk-Anderson 

    Let's say the start date (6th Feb 2023) is in D100.

    The end date is returned by

     

    =D100+100%/C100*(TODAY()-D100)

     

    Format the cell with the formula as a date.

  • HansVogelaar's avatar
    HansVogelaar
    MVP
    Apr 10, 2023

    Kirk-Anderson 

    Let's say the start date (6th Feb 2023) is in D100.

    The end date is returned by

     

    =D100+100%/C100*(TODAY()-D100)

     

    Format the cell with the formula as a date.

    • Kirk-Anderson's avatar
      Kirk-Anderson
      Copper Contributor
      Apr 12, 2023
      Follow up question, our project (migration of data between 2 health systems with a 3 month gap) is generating a lot of issues, which the spreadsheet keeps a track of, these will be dealt with one the main project gets to 100%. This figure is a number, not a percentage, is there a similar formula you could come up with that would estimate completion date if the start date is in C103 and the number of issues is in C101? Thanks in advance.
      • HansVogelaar's avatar
        HansVogelaar
        MVP
        Apr 12, 2023

        Kirk-Anderson 

        You have the start date in C103 and the number of issues in C101. What other info can we use? The number of issues resolved per day? The number of issues has been resolved up to today? Something else?