Learn how to count the number of unique and distinct values in a column based on data in another column using array in Microsof Excel.

If you are unfamiliar with inputting formulas into Microsoft Excel, the much simpler way to get the number of unique values in an Excel column is through a filter.

Specifying the conditional count of a value sounds like a daunting task, but two Excel functions make quick work of this challenge.

When counting unique values in Microsoft Excel, use UNIQUE() as a helper function and avoid more complicated expressions.

Click the "Count" option to place a checkmark next to it. Click one of the column headers in the document that has values. The word "Count" appears in the status bar's bottom right corner.

The third column, Column C, will display the count of days when we subtract the value of Column A from the value of Column B, for each row in the spreadsheet.