## Count contiguous values

*Article updated on April 23, 2017*

In column A, I have a long random list of two variables, "N/A" and the value 1. In column B I want to identify the number of contiguous occurrences of the value 1 before the next appearance of "N/A". I wonder if you could point me to the best way of achieving this please? Example below shows what I am after.Much appreciation for your excellent website,

DavidCol A Col B

N/A

N/A

1

1

1

1

1 5

N/A

1

1

1

1 4

N/A

N/A

1

1 2

N/A

N/A

N/A

1 1

Thanks, David.

The following formula looks for contiguous values, not only 1 and N/A.

**Array formula in cell B3:**

Read Rick Rothsteins's comment.

**How to enter an array formula**

- Select cell B3
- Paste above formula to formula bar
- Press and hold CTRL + SHIFT simultaneously
- Press Enter once
- Release all keys

Copy cell B3 and paste to cells below as far as needed.

If you want to learn more about array formulas join my Advanced excel course.

### Download excel *.xlsx file

identify-the-number-of-contiguous-occurrences-of-a-value-david.xlsx

Count how many times a string exists in a cell range (case insensitive)

Question: How do I count how many times a word exists in a range of cells? It does not have […]Count how many numbers between a specific value occurring multiple times

jeyner asks: I need to count in a list the interval between the same value. Example list, 1-2-3-1-4-5-1-6-7-8-9-7-8-1 So the […]### 4 Responses to “Count contiguous values”

### Leave a Reply

**How to add a formula to your comment:**

<code>your formula</code>

Remember to convert less than and larger than signs to html character entities before you post your comment.

**How to add VBA code to your comment:**

[vb 1="vbnet" language=","]

VBA code

[/vb]

**How to add a picture to your comment:**

Upload picture to postimage.org

Add picture link to comment.

**Contact Oscar**

You can contact me through this webpage

First off, you show your formula starting in cell B3... you need to adjust it so that it starts in cell B2, otherwise you will not show a 1 in cell B2 if cell A2 differs from cell A3.

Second, here is a much simpler, still array-entered, formula, placed in cell B2 and copied down, that appears to produce the same output as your formula...

=IF(A3<>A4,ROW()-MAX(IF(A$1:A2<>A3,ROW(A$1:A2))),"")

Sorry, I posted the wrong formula, plus it looks like the comment processor ate my less than greater than symbol. Here is the correct array-entered formula, rearrange to eliminate the display problem...

=IF(A2=A3,"",ROW()-MAX(IF(A$1:A1<>A2,ROW(A$1:A1))))

D@MN! I missed that the comment processor ate a second less than, greater than symbols in my formula. Here now is the correct [b]array-entered[/b] formula (rearranged so that there are no less than, greater than symbols at all)..

=IF(A2=A3,"",ROW()-MAX(IF(A$1:A1=A2,,ROW(A$1:A1))))

Rick Rothstein (MVP - Excel),

Your formulas work fine, thanks. So much better and smaller than mine.

I am sorry for wordpress eating your less/greater than signs, I try to edit your comments as soon as I can.