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How to count rows until a certain sum value is reached in Excel?

For instance, there is a range of data, column A includes product number, and column B contains order amount, and you have a certain value such as 80, which is the total of first nth numbers in Order, how can you count how many rows are involved to sum up to 80 as below screenshot shown?
doc count until sum reach 1

Count rows until a certain summed value is reached with formula

arrow blue right bubble Count rows until a certain summed value is reached with formula

To count the number of rows which are used to sum up to a certain matched value, you can apply a formula.

Select a blank cell, E2 for instance, and enter this formula =MATCH(D2,SUBTOTAL(9,OFFSET(B2,,,ROW(B2:B17)-ROW(B2))),1), press Shift + Ctrl + Enter key to get to the correct result. See screenshot:
doc count until sum reach 2

Tip: In this formula, D2 is the certain value you want to reach by summing, B2:B17 is the values range you sum from, you can change them as you need.

If you want to exclude the header row, you can use this formula =MATCH(D2,SUBTOTAL(9,INDIRECT("$B$1"&":"&ADDRESS(ROW($B$1:$B$17),COLUMN($B$1)))), and press the  Shift +Ctrl + Enter keys simultaneously.

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  • To post as a guest, your comment is unpublished.
    Diane · 2 years ago
    hi , what can be the formula but to count columns?
    • To post as a guest, your comment is unpublished.
      Sunny · 2 years ago
      Hello, Diane, just change ROW to COLUMN in the formula like =MATCH(A2,SUBTOTAL(9,OFFSET(A1,,,COLUMN(A1:E1)-COLUMN(B2))),1). See screenshot:
      • To post as a guest, your comment is unpublished.
        Sam Griffith · 11 months ago
        This doesn't work - I think it's because subtotal only works vertically?
  • To post as a guest, your comment is unpublished.
    Damien · 3 years ago
    After reading this solution, I started reading about array formulas. Very interesting and useful. With respect to this solution, it solves a very challenging aspect of material stockpile size and composition tracking. Can you help me with one little change...I want the position in the list of the total going from the bottom of the list up vs top down in your example. I've tried a few things but not cracked it yet, mainly due to not fully understanding the formula syntax yet. Any suggestions? Particularly interested in the exclude header version, or a version that does not include any header consideration since I wish to calculate this fresh on each row (i.e. day.)
    • To post as a guest, your comment is unpublished.
      Damien · 3 years ago
      Never mind. I figured out a simple, non array way to do what I wanted to do.