The SUM function then adds up these entries to find the count for the duplicate values. The unary operator (–) transforms the values to an array of 0 and 1’s. This results in an array of logical values TRUE and FALSE. The EXACT formula performs a case-sensitive compare for the values in column D with the grades in C2 to C8.

Press Ctrl + Shift + Enter to apply the formula as an array formula.

To find a case-sensitive count for duplicate values: But you can use a combination of the SUM and EXACT function to get a case-sensitive count for duplicate instances. You won’t get the actual count if you use it to count a case-sensitive duplicate. The COUNTIF function in Excel is case-insensitive. This will show the count of duplicate values without the first instance in column E. To count the duplicate examples from the last example without the first occurrence:

You can count the number of duplicates excluding the first entry in the same way as the previous example. Often you might need to calculate the number of duplicates in your data without the first occurrence. How to Count Duplicate Instances excluding the First Occurrence Now you have the count for duplicate grades in column E. Assign the formula =COUNTIF($C$2:$C$8,E2).To find the count of duplicate grades including the first occurrence: Column D has the unique grades for which you are going to count the duplicates.

The data contains the student name, age, and grades. The following example includes the data on student grades. How to Count Duplicate Instances Including the First Occurrence In the next sections, you will see some examples related to counting duplicates. You might want to include or exclude the first instance when counting duplicates. There are a few approaches counting duplicates. You can count duplicates using the COUNTIF formula in Excel. In this tutorial, you will learn how to count duplicates using this function. You can count duplicate values using the COUNTIF function. Working with large data sets often requires you to count duplicates in Excel.

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