Find duplicate values in Excel by formula?

Find duplicate values in Excel by formula?
Last Updated on 12/05/2024
Reading time: 2 minutes

How do you find the duplicate values in your Excel columns by formula? With Excel 365, you need only 2 functions

Combination of FILTER and COUNTIF functions

To find the duplicate values in Excel by formula, you must associate the FILTER and COUNTIF functions.

  1. The COUNTIF function

    We will create a logical test with this function to find duplicate values

  2. The FILTER function

    This function will be used to keep only the duplicate values

In our example, we added the data into a table (Insert > Table), and the table name was tbl_Data. This information will be used in the references of the formula.

Create the test to find the duplicate values

Since the dynamic array functions have been added to Excel, you can write the standard Excel functions differently. For instance, with COUNTIF, you can write a range of cells as criteria, and not only for one cell like it us to be.

=COUNTIF(tbl_Data[Value],tbl_Data[Value])

COUNTIF to count how many time each value

And then, we simply convert this function into a logical test for all the values greater than 1

=COUNTIF(tbl_Data[Value],tbl_Data[Value])>1

Logical test when there is duplicate values

Keep only the duplicate values

To keep only duplicate values, we will insert the previous logical test as a criterion for the function FILTER. The beauty of FILTER is to return the values when the test is TRUE.

=FILTER(tbl_Data[Value],COUNTIF(tbl_Data[Value],tbl_Data[Value])>1)

Formula to return duplicate values

Of course, it's not necessary to return every duplicate value. So you can embed the previous formula into the UNIQUE function.

=UNIQUE(FILTER(tbl_Data[Value],COUNTIF(tbl_Data[Value],tbl_Data[Value])>1))

Keep only one duplicate value

Whatever the number of items you have, 2 times, 3 times, .... they will be returned by the formula 😀👍

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Find duplicate values in Excel by formula?

Reading time: 2 minutes
Last Updated on 12/05/2024

How do you find the duplicate values in your Excel columns by formula? With Excel 365, you need only 2 functions

Combination of FILTER and COUNTIF functions

To find the duplicate values in Excel by formula, you must associate the FILTER and COUNTIF functions.

  1. The COUNTIF function

    We will create a logical test with this function to find duplicate values

  2. The FILTER function

    This function will be used to keep only the duplicate values

In our example, we added the data into a table (Insert > Table), and the table name was tbl_Data. This information will be used in the references of the formula.

Create the test to find the duplicate values

Since the dynamic array functions have been added to Excel, you can write the standard Excel functions differently. For instance, with COUNTIF, you can write a range of cells as criteria, and not only for one cell like it us to be.

=COUNTIF(tbl_Data[Value],tbl_Data[Value])

COUNTIF to count how many time each value

And then, we simply convert this function into a logical test for all the values greater than 1

=COUNTIF(tbl_Data[Value],tbl_Data[Value])>1

Logical test when there is duplicate values

Keep only the duplicate values

To keep only duplicate values, we will insert the previous logical test as a criterion for the function FILTER. The beauty of FILTER is to return the values when the test is TRUE.

=FILTER(tbl_Data[Value],COUNTIF(tbl_Data[Value],tbl_Data[Value])>1)

Formula to return duplicate values

Of course, it's not necessary to return every duplicate value. So you can embed the previous formula into the UNIQUE function.

=UNIQUE(FILTER(tbl_Data[Value],COUNTIF(tbl_Data[Value],tbl_Data[Value])>1))

Keep only one duplicate value

Whatever the number of items you have, 2 times, 3 times, .... they will be returned by the formula 😀👍

Related articles

Leave a Reply

Your email address will not be published. Required fields are marked *