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How to assign serial number to duplicate or unique values in Excel?

Author: Xiaoyang Last Modified: 2020-05-19

If you have a list of values which contains some duplicates, is it possible for us to assign sequential number to the duplicate or unique values? It means giving a sequential order for the duplicate values or unique values as following screenshot shown. This article, I will talk about some simple formulas to help you solving this task in Excel.

doc assign duplicates unique 1

Assign serial number to duplicate values with Formula

Assign serial number to unique value with Formula


arrow blue right bubble Assign serial number to duplicate values with Formula

To order the duplicate values, please apply the following formula:

Enter this formula: =COUNTIF($A$2:A2,A2) into a blank cell beside your data, and then drag the fill handle down to the cells which you want to apply this formula, and the cell values have been assigned based on the duplicate values, see screenshot:

doc assign duplicates unique 2


arrow blue right bubble Assign serial number to unique value with Formula

To assign serial number to unique value, the below formula may do you a favor:

Enter this formula: =IF(COUNTIF(A$2:A2,A2)=1,MAX(B$1:B1)+1,VLOOKUP(A2,A$1:B1,2,0)) into a blank cell beside your data, and then drag the fill handle down to the cells that you want to apply this formula, and the unique values have been ordered as following screenshot shown:

doc assign duplicates unique 3

Notes:

1. In the above formula, A2 is the cell contain the value you want to assign, B1 is the above cell where your formula located.

2. These formulas also can applied to the values in sorted list, and you will get the following result as you want:

doc assign duplicates unique 4

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Comments (23)
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This comment was minimized by the moderator on the site
Solución bastante sencilla y funciona bien.
This comment was minimized by the moderator on the site
Getting NA result for more than 200 cells
This comment was minimized by the moderator on the site
Thanks for the formula, my only problem is that I want the generated 'unique identifiers' to be locked/linked to the 'values' but whenever I sort the table, the identifiers always remain in the same spot. Is there a way so that they stay linked to one another?

For example, I am using this code to assign serial numbers to customers, these need to be permanently assigned to one another as they do not change. However, when I sort the table by date, customers or anything at all that re-arranges the data. The serial numbers all get mixed up.
This comment was minimized by the moderator on the site
How to Convert a Cell Containing


A1 = Apple, Orange, Banana, Grapes

to

A1 = 1. Apple, 2. Orange, 3. Banana, 4. Grapes
This comment was minimized by the moderator on the site
Hello there,

If i want the formula to have alphabet infront is it possible?

DO123455 =A1
DO123455 =A1
DO223344 = A2
DO223344 = A2
DO567890 = A3

Appreciate if you can assist on my problem.

Thank you

YT Kong
This comment was minimized by the moderator on the site
Hi, i want some help, i need my data right this:

A 1
A 2
A 3
B 1
B 2
C 1
D 1
C 1
C 2
B 1
E 1
E 2
A 1
I need taht when it finds a new value starts since 1, every time. Is it posible ?
This comment was minimized by the moderator on the site
=COUNTIF(G$2:G2,G2)
=COUNTIF(G$2:G3,G3)
This comment was minimized by the moderator on the site
I want serial number start from 1 when it encounter new series
Like
AA - 1
BB - 1
AA - 2
CC -1
DD -1
AA - 3
BB - 2

Is this possible?
This comment was minimized by the moderator on the site
possible, simple guys=IF(COUNTIF(A$2:A7;A7)>=1;COUNTIF(A$2:A7;A7);VLOOKUP(A7;A$2:W6;23;0)+1)
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=COUNTIF(G$2:G2,G2)
=COUNTIF(G$2:G3,G3)
This comment was minimized by the moderator on the site
Is it possible to do this with power query, and not with the vlookup formula?
This comment was minimized by the moderator on the site
Is it possible to assign such serial numbers within the same cell? I have a sheet that does this using a macro, but I cannot access the macro (password protected) to see how they did it.
Disclaimer: I have permission to access the macros, but it is an old sheet and the passwords are lost.
This comment was minimized by the moderator on the site
hai pls help

i have a series of data and i want this type of results
item product sequence number
a powder 1
a juice 2
b preprocess 2
b process 3
b jucie 1
c powder 1
c juice 2
c preprocess 3
c procss 4


want sequence number based on item and product column
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