## Count identical numbers in two columns but items must be in same row

Hi Oscar,Need a formula to count identical numbers in two columns but items must be in same row (position).

12 15

8 8 good count 1

22 19

7 22 for 22 not count cause is not in same row

14 14 good count 2

Array formula in cell E2:

**How to enter an array formula**

- Select cell E2
- Paste the formula in formula bar
- Press and hold CTRL + SHIFT simultaneously
- Press Enter
- Release all keys

Your formula now begins and ends with a curly bracket, if you did it right.

Like this {=SUM((A2:A6=B2:B6)*1)}

### Explaining formula

**Step 1 - Compare values in column A with column B**

A2:A6=B2:B6

becomes

{12;8;22;7;14}={15;8;19;22;14}

and returns

{FALSE;TRUE;FALSE;FALSE;TRUE}

**Step 2 - Multiply boolean values with 1**

To be able to sum the values in this array {FALSE;TRUE;FALSE;FALSE;TRUE} we need to convert them to 0 and 1. FALSE = 0 and TRUE = 1.

(A2:A6=B2:B6)*1

becomes

({FALSE;TRUE;FALSE;FALSE;TRUE})*1

and returns

{0;1;0;0;1}

**Step 3 - Sum values in array**

SUM((A2:A6=B2:B6)*1)

becomes

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

and returns 2.

This formula also works with text values, to remove blanks before and after use TRIM function.

### Download excel *.xlsx file

Count identical numbers in two columns but items must be in same row.xlsx

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You can use non array formula, like this:

=SUMPRODUCT((A2:A6=B2:B6)*(A2:A6/B2:B6))

Try to find another non array formula.

There is a number of ways to make such a count as non array formula, e.g. =SUM(INDEX((A2:A6=B2:B6)*1,,)). But why not use array formula if it does the job?

[quote]Leonid says:

April 12, 2016 at 6:49 pm

There is a number of ways to make such a count as non array formula, e.g. =SUM(INDEX((A2:A6=B2:B6)*1,,)). But why not use array formula if it does the job?[/quote]

I suspect that Kidd has many more rows and columns in his file and CSE formulas are eating resources.