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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  • To post as a guest, your comment is unpublished.
    Inez · 5 months ago
    Hey! I have to imput steps from 1 to 15 and then the time used for that step is displayed in another collumn but then I want this time to stay the same when I change te step number. How do i make a collumn stay the same so I can imput other data? 

  • To post as a guest, your comment is unpublished.
    Evelyne · 6 months ago
    If i have a list like this


    How do i make it keep increment the sequence number in function of the name, i want it to recognized that he already seen this word/Number before in the column. do i have to always put a sorting filter to make it work?


    • To post as a guest, your comment is unpublished.
      Mace · 5 months ago
      If you use the other suggested formula, =COUNTIF($A$2:A2,A2), Excel keeps counting no matter the order the words are in.
  • To post as a guest, your comment is unpublished.
    hrishkesh.pattepu · 8 months ago
    Hello Is there a way to calculate orange as total 6 and not show the increment order like 1,2,3,4,5 but at the end of row as 6 before entering into next new name
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    Ali Khan · 3 years 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 · 3 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
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    Mark Higgins · 4 years ago
    Would this still work if Apple appeared in cell A19?
  • To post as a guest, your comment is unpublished.
    Edwin · 4 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?