September 2016

This tutorial will walk you through how to use the **COUNTIF** formula on Microsoft Excel to see if entries of a specified column are also present in another column.

## How To Compare Numbers in Two Columns on Excel

## Issue

I need to compare numbers in two columns of Excel to find duplicates in data. Both columns have essentially the same numbers, but Column B has multiple instances of the same number. Column A is unique. How can I ascertain if every number in Column A is present in Column B at least once? How can I find the number that is missing from Column B?

## Solution

Find duplicates in your data by using the **COUNTIF** formula. This can be done by first adding an additional column to your table. Assuming your data in Columns A and B begin at line two, insert the following formula into Column C2:

The resulting number shown in Column C2 will tell you how many times the value in A2 appears in column B.

Compare all data in the table by highlighting C2 and dragging the formula to the last row of data entry in Column C.

More tips about comparing and pasting in Excel can be found here:

http://ccm.net/faq/4698-excel-comparing-cell-a1-to-entire-a-column-in-sheet-2

http://ccm.net/faq/5475-excel-comparing-and-pasting

## Note

Thanks to rizvisa1 for this tip on the forum.

A B

B.121 S.222

S.154 B.121

B.164 S.154

B.187 B.154

=COUNTIF(B:B,A2)

The resulting number shown in Column C2 will tell you how many times the value in A2 appears in column B.

Compare all data in the table by highlighting C2 and dragging the formula to the last row of data entry in Column C.

More tips about comparing and pasting in Excel can be found here:

http://ccm.net/faq/4698-excel-comparing-cell-a1-to-entire-a-column-in-sheet-2

http://ccm.net/faq/5475-excel-comparing-and-pasting