# Calculate turn around time

#### kgkev

##### Well-known Member
I have an enquiry open date in one column and a close date in another.

Is it possible to have a formula that calculates the average turn around time without calculating the individual times against each row?

Start date is in "B" close date is in "M"

This is what I have but I'm not sure if its accurate?

Code:
``=(SUM('Completed Rejects'!M:M)-(SUM('Completed Rejects'!B:B)))/COUNT('Completed Rejects'!M:M)``

Last edited:

### Excel Facts

What is the last column in Excel?
Excel columns run from A to Z, AA to AZ, AAA to XFD. The last column is XFD.

#### lynxbci

##### Board Regular
Your formula is correct it works out the total time difference and then divides by the number of times which will give an average.

=(SUM(M:M)-SUM(B:B))/COUNT(M:M)

or

to ignore 0 times

=(SUM(M:M)-SUM(B:B))/COUNTIF(M:M,">0")

Kev

#### kgkev

##### Well-known Member
Thanks - More of a basic maths question than excel I suppose.

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