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How to find the first duplicate value in Excel column?

Author: Sun Last Modified: 2020-10-09

Here is a list with some duplicate names, can you find all first duplicate values from the list except looking up one by one manually? Actually, I have a formula can quickly identify the first duplicate values in Excel list.

Find the first duplicate value with formula

Find all duplicate values except first one with Select Duplicate & Unique Cellsgood idea3


Find the first duplicate value with formula

Please use below formula to find the first duplicate value in the list.

=IF(COUNTIF(A:A,A1)>1,IF(COUNTIF(A$1:A1,A1)=1,"DUPLICATE",""),"")

Press Enter key, drag fill handle down to fill this formula to cells.
doc find first duplicate 1


Find all duplicate values except first one with Select Duplicate & Unique Cells

If you want to find all duplicate values but excluding the first duplicate, in this case, you can apply the Select Duplicate & Unique Cells utility of Kutools for Excel to handle the job.

Kutools for Excel, with more than 300 handy functions, makes your jobs more easier. 

After installing Kutools for Excel, please do as below:(Free Download Kutools for Excel Now!)

1. Select the list you want to find duplicates except first one, click Kutools > Select > Select Duplicate & Unique Cells.
doc find first duplicate 2

2. In the Select Duplicate & Unique Cells dialog, check Duplicates (Except 1st one) option, you also can change the Fill backcolor and Fill font color to highlight the duplicate values.
doc find first duplicate 3

3. Click Ok, a dialog pops out to remind you the number of selected items, click OK to close it.
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Now the duplicates except first one have been selected and highlighted.
doc find first duplicate 5



Tip.If you want to compare two tables and select or highlight the same or different values, you can try Kutools for  Excel's Select Same & Different Cells utility.

In Excel, if there are two tables in a sheet or two sheets needed to be compared, generally, you will compare one row by one manually. But if you have Kutools for Excel's Select Same & Different Cells utility, you can quickly find the same rows or different rows, and, also, you can highlight them with background color or font color as you need. Free trial for 30-days!
doc select same difference
 
Kutools for Excel: with more than 300 handy Excel add-ins, free to try with no limitation in 30 days.

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Comments (2)
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This comment was minimized by the moderator on the site
This doesn't work. Look at "Henrry" - it doesn't count the second instance as a duplicate, only the last instance.
This comment was minimized by the moderator on the site
Hi, CB, the formula provided in this tutorial is used to find the duplicate values which are appeared at first time, the second instance cannot marked. If you want to mark all duplicates, please visit this tutorial How to find duplicates without removing them in Excel?
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