Automate percentage complete in an Excel Gantt chart

**brndtaylor** · 06-22-2007, 10:05 PM

I just download a free excel Gantt chart template (see attached file). The goal is to calculate the percentage complete automatically for the sub tasks. My thought process was to determine how many days from present date (see cell C8) and the start date of the subtask (see D14) and subtract that from the days remaining in the subtask (see cell H14). Then convert into a percentage (see cell G14).

The problem I have is when the subtask has not stated as of the present date the output is a negative number.

What I want to happen is when the output or sum is negative than it should be zero. That way the percentage will be zero and the Gantt bar will not move. Please let me know if more information is needed.

Any help or hints will be greatly appreciated.

**oldchippy** · 06-23-2007, 06:44 AM

Is this what you want? In cell F4

=IF(OR(D14="",E14=""),0,DAYS360(D14,E14)+1) then in cell G14

=IF(ISERR((F14-(F14-H14))/F14),0,(F14-(F14-H14))/F14) then in cell H14

=IF(OR(D14="",E14=""),0,DAYS360(D14,C8))

**brndtaylor** · 06-24-2007, 12:20 PM

Since the goal is to enter o% if the task has not started I can do the following.

If today’s date in C8 is not equal to or greater than the start date of the subtask in cell G14 leave than leave it 0% or 0 in D14
If today’s date is great than the subtask start date (D14), then calculate the percentage of days worked in G14 % complete.

I just am not sure of the formula. But will have time to work on it later tonight. I know a little about formulas and programming. So if you have any tips or sites I can use please let me know.

Again thanks for your speedy reply. Have a great day.

**oldchippy** · 06-24-2007, 05:55 PM

Here's a few sites, starting with this one

http://www.exceltip.com/exceltips.php?view=excel_links

http://www.contextures.com/tiptech.html

http://exceltips.vitalnews.com/

There's also plenty more on the link below oldchippy

**brndtaylor** · 06-24-2007, 09:21 PM

I hope you don't mind helping me again. But I am unable to get the formula to work. Below is what I am tring to achive. Also I have attached the document I am working from

Create a formula to return the % complete (G14).

To return the % complete calculate the numbers of days between the subtask and today’s date in %.
But if a negative number is returned because the start date has not begun yet return a zero.

My thinking is you use the following

Subtask Start date D14
Today’s Date C8
Duration Days

But if you have a better way please let me know.

Thanks again for your help

**oldchippy** · 06-25-2007, 06:48 AM

Try this,

=IF(D13>$C$8,0,($C$8-D13)/$G$12) format as a percentage

**brndtaylor** · 06-25-2007, 07:15 PM

It almost worked. But if today’s date in greater than the end date of the subtask it adds the additional days and percentage. What I need to happen is once the subtask ends it stays at 100%. So I am trying to work that out.

Thanks for getting me this far.

Any help will be greatly appreciated.