## Count unique distinct values in two columns

**Formula in C12:**

**How to create an array formula**

- Double click on cell C12
- Paste above formula
- Press and hold Ctrl + Shift
- Press Enter

### Explaining formula in cell C12

#### Step 1 - Count values in cell range B3:B8

The COUNTIF function counts values equal to a condition or criteria.

COUNTIF($B$3:$B$8, $B$3:$B$8)

becomes

COUNTIF({"AA";"BB";"AA";"CC";"BB";"AA"}, {"AA";"BB";"AA";"CC";"BB";"AA"})

and returns

{3;2;3;1;2;3}

#### Step 2 - Divide 1 with array

1/COUNTIF($B$3:$B$8, $B$3:$B$8)

becomes

1/{3;2;3;1;2;3}

and returns

{0.333333333333333;0.5;0.333333333333333;1;0.5;0.333333333333333}

#### Step 3 - Sum values

The SUM function simply adds the numbers and returns the total.

SUM(1/COUNTIF($B$3:$B$8, $B$3:$B$8))

becomes

SUM({0.333333333333333;0.5;0.333333333333333;1;0.5;0.333333333333333})

and returns 3.

#### Step 4 - Which values exist in cell range $D$3:$D$8

COUNTIF($B$3:$B$8, $D$3:$D$8)=0

becomes

COUNTIF({"AA";"BB";"AA";"CC";"BB";"AA"}, {"BB";"CC";"DD";"CC";"BB";"BB"})=0

becomes

{2;1;0;1;2;2}=0

and returns

{FALSE; FALSE; TRUE; FALSE; FALSE; FALSE}

#### Step 5 - Convert TRUE to corresponding number

The IF function uses a logical expression (argument1) to determine which value to return (TRUE - argument2 , FALSE - argument3)

IF(COUNTIF($B$3:$B$8, $D$3:$D$8)=0, 1/COUNTIF($D$3:$D$8, $D$3:$D$8), 0)

becomes

IF({FALSE; FALSE; TRUE; FALSE; FALSE; FALSE}, 1/COUNTIF($D$3:$D$8, $D$3:$D$8), 0)

becomes

IF({FALSE; FALSE; TRUE; FALSE; FALSE; FALSE}, {0.333333333333333;0.5;1;0.5;0.333333333333333;0.333333333333333}, 0)

and returns

{0;0;1;0;0;0}.

#### Step 6 - Sum array

SUM(IF(COUNTIF($B$3:$B$8, $D$3:$D$8)=0, 1/COUNTIF($D$3:$D$8, $D$3:$D$8), 0))

becomes

SUM({0;0;1;0;0;0})

and returns 1.

#### Step 7 - Add numbers

SUM(1/COUNTIF($B$3:$B$8, $B$3:$B$8))+SUM(IF(COUNTIF($B$3:$B$8, $D$3:$D$8)=0, 1/COUNTIF($D$3:$D$8, $D$3:$D$8), 0))

becomes

3+SUM(IF(COUNTIF($B$3:$B$8, $D$3:$D$8)=0, 1/COUNTIF($D$3:$D$8, $D$3:$D$8), 0))

becomes

3+1

and returns 4 in cell D12.

**Download Excel *.xlsx file**

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### 15 Responses to โCount unique distinct values in two columnsโ

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**Contact Oscar**

You can contact me through this contact form

Hi, hope you can help me.

If I have the below data:

A B

1 1233 MEL

2 4562 MEL

3 1233 MEL

4 7625 SYD

5 7352 SYD

6 4562 MEL

7 2447 SYD

How do I find out how many unique codes there are in column A from โMEL" in B? Iโve tried multiple formulas but they keep coming up as zero, whereas in this case the answer should be 2.

Thanks!

Bet,

read this post:

Count unique distinct values that meet multiple criteria in excel

Hi,

How would you count three columns of unique users? I have three worksheets of people who have received training, some people are on multiple worksheets and multiple times. I just want to find how many unique users there are in total.

Angelica,

Try this array formula:

=SUM(IF(List1<>"",1/COUNTIF(List1,List1),0))+SUM(IF((COUNTIF(List1,List2)=0)*(List2<>""),1/COUNTIF(List2,List2),0))

It counts unique values from two columns with blanks. List1 and List2 are named ranges.

Three ranges are more complicated.

Thanks Oscar, I tried the formula but it didn't work. I think because of the "" part. I got a #Value! error.

I'm not that familiar with "", so I tried taking out , but that didn't work, then I tried taking out "". That didn't work either.

I already named my lists Basics, Advanced and Contribute since I have three columns in three separate tabs. Basics is a column from B3 to B301, Advanced is from B3 to 101, Contribute is from B3 to B101.

The formula I tried was:

=SUM(IF(Basics"",1/COUNTIF(Basics,Basics),0))+SUM(IF((COUNTIF(Basics,Contribute)=0)*(Contribute""),1/COUNTIF(Contribute,Contribute),0))

Any advice would be appreciated!

Those right and left carets aren't showing up in my post. But I did use them.

Angelica,

Those right and left carets aren't showing up in my post. But I did use them.That is how you recognize an array formula in excel because it is enclosed in curly brackets { }.

There are instructions in this post about how to create array formulas.

Also I should mention that the list grows weekly and the Lists I have created have several blank cells which is why I couldn't get your example to work for my problem.

Hello,

I have data in the following format:

Longitude Latitude Magnitude

72.87 33.73 7.6

69.45 37.15 6.9

69 34.5 5.3

69.1 34.5 7.2

71.8 34.8 5.3

75.5 33.5 7.6

75 34 6.9

73.23 33.37 6.9

77 35 6.1

76 34 5.3

72.3 33.9 6.1

80 30 7.5

75 34 6.9

80 31.3 7

75 34 7

76 34 5.3

75 34 6.7

75 34 6.5

80 30 6.1

79 31.5 7.5

79 30 6.9

I want to count number of magnitude values in column three in 0.1*0.1 latitude and longitude e.g (Between 76.1 long and 34.1 Lat).

Can somebody please help me? I shall be thankful

Muhammad Waseem

Muhammad Waseem,

I am not sure I understand, you want to count longitude values less than 76.1 and latitude values more than 34.1?

Dear Oscar,

Thank you very much for your response. Your comment is helpful. Actually, I am interested in counting in numbers between 34.1 and 34.2, 76.1 and 76.2: 34.2-34.3, 76.2-76.3 and so on.

Thank you

Muhammad Waseem

Muhammad Waseem,

Download *.xlsx file

count-long-and-latv2.xlsx

Dear Mr. Oscar,

Thank you very much for the help and for the file.

Regards,

Muhammad Waseem

Hi Oscar, hope you can help me.

I have two columns, 'A. Call Subject' and 'B. Issue'.

I am trying to report the number of Issues that are related to Call Subject.

The problem is that text in 'B. Issue' can be "other" for many 'A. Call Subject'.

An example, 'A. Call Subject' cells have the following text - "Sales", "Technical", "Other" - and 'B. Issues' has texts of - "New Product" and "Other" -.

How can I count the number of "other" from 'B. Issues' that are related to 'A. Call Subject' of Sales" or Technical.

Hi Mr. Oscar - thank you for a great and very clear article! I have used your suggestion successfully.

Question: Is there a way to achieve the same result (a count of unique values) using the Excel UNIQUE function instead of this approach? My 2 columns of data includes both text strings and real numbers, so would need to handle those.

Thank you again! (Also love your profile!!)