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How to increment numbers when value changes in another column?

doc increment value changes 1

Supposing, you have a list of values in column A, and now you want to increment number by 1 in column B when the value in column A changes, which means the numbers in column B increment until the value in column A changes, then the number increment starts from 1 again as left screenshot shown. In Excel, you can solve this job with following method.

Increment numbers when value changes in each group with formula


arrow blue right bubble Increment numbers when value changes in each group with formula


To increment numbers based on another column when value changes, the following simple formula may help you.

1. Enter this formula: =IF(A2<>A1,1,B1+1) into a blank cell which beside your data, B2, for instance, see screenshot:

doc increment value changes 2

2. Then drag the fill handle down to the cells that you want to fill sequence numbers and restart for every change in column A, see screenshot:

doc increment value changes 3

Note: Here is another formula =COUNTIF($A$2:A2,A2) also can help you to create a number sequence that restarts for every change in another column.


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  • To post as a guest, your comment is unpublished.
    Ali Khan · 8 months ago
    i need to increment number using the duplicate criteria, means if the criteria changes the Main Serial Number and Sub Serial Number should change, for example
    1.1 604
    1.2 604
    2.1 605
    2.2 605
    2.3 605
    3.1 606
    3.2 606
    4.1 607
    4.2 607

    hope you got my point. kindly help
  • To post as a guest, your comment is unpublished.
    josefin · 1 years ago
    is there a way to do this but I want to separate the different numbers, for example like
    A1 1
    A2 1
    A3 2
    A4 3
    A5 3

    I would like to automatically calulate the maximum number 1 in a row, maximum number 2 etc
  • To post as a guest, your comment is unpublished.
    Mark Higgins · 1 years ago
    Would this still work if Apple appeared in cell A19?
  • To post as a guest, your comment is unpublished.
    Edwin · 2 years ago
    If i want to do this

    A B
    J1 jack
    J2 jack
    A1 alvin
    A2 alvin
    C1 charlie

    What code should i put in cell a1?

    Edwin