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Want to Count number Repeated numbers in a Column

Hi There

I have a list of numbers in a Column and I have been asked to find out how many of the same number are repeated in the Column. I have tried a count if but does not appear to work.

Any ideas of the best way to count how many duplicates ,as I have as a very long list?

Many Thanks

Leicester Fox
 
I don't see the problem.
=COUNTIFS(numbers, numbers )
If you have a list of unique occurrences, then
= COUNTIFS(numberArray, unique)
will give a more compact presentation without duplicate information.
The dynamic array formula for a sorted unique list is
=SORT(UNIQUE(numbers))
but this can also be achieved manually from the Data tab by using Remove Duplicates.
 
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