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How to calculate the percentage between two dates in Excel?

Author: Xiaoyang Last Modified: 2019-10-21

Supposing, I have a list of tasks with start date and end date, now, I want to calculate the percentage of completion of the task based on today’s date as the following screenshot shown. How could you solve this job in Excel?

Calculate the percentage of completion between two dates with formula

Calculate the percentage of completion between two dates with formula

For calculating the percentage of completion of task between two dates, please apply the below formula:

1. Enter this formula into a blank cell where you want to get the result:

=(DATEDIF(B2,TODAY(),"d")+1)/(DATEDIF(B2,C2,"d")+1)

Note: In this formula, B2 is the start date cell, and C2 is the end date cell.

2. Then, drag the fill handle down to the cells you want to apply this formula, and you will get the result as below screenshot shown:

3. Keep selecting the formula cells, and then click Percentage Style under the Home tab in the Number group, and you will get the percentage value as following screenshot shown:

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Comments (25)
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kevin
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i used your formula for the different dates to get status of completion. the first cell works, then when I drag down to the other cells, i get #NUM!
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creativekat
creativekat
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Hello - Is there a way to combine both these options?

So that the calculation will show O instead of #NUM! if the date is in the future AND stay at 100% if the end date has passed.

That would be the ideal thing.
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creativekat
creativekat
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Is there a way to incorporate both these items? I would like it to stay at 100% once the date passes and that it shows 0% instead of the #NUM! error if the date is in the future?
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Alan
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I am using the formula:

=MIN(1, (DATEDIF(B2,TODAY(),"d")+1)/(DATEDIF(B2,C2,"d")+1))

which is working great and leaves the percentage at 100% once the end date has passed.
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Sebatian
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How can you calculate a date difference in days using a percentage in excel?

Basically, I'm looking to implement a start date for an activity based on the fraction of 15/52. The idea is that an activity starts 3 weeks from a kick-off date.

However, a series of projects have variable durations. As such I want to represent 15 weeks out of 52 weeks in a formula I can use across all projects to work on the same principle.

The idea is to use a start date and project into the future using a percentage to define the next start date for another activity to commence.
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Murilo
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Qual a formula para não dar mais que cem e menos de zero?
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