How to use the UNIQUE () function in Excel If you’re using Microsoft 365 or one of the 2019 standalone versions of Excel, you can quickly create a dynamic list using the UNIQUE () function.

Populating a dropdown with a dynamic list is easy thanks to Microsoft Excel’s UNIQUE() dynamic array function.

The UNIQUE function in Excel 365 is designed to extract distinct values from a given range of data.

Input the ROWS function into that cell using the first and last cells of that column, not including the column heading. After that, you will know how many unique values are in that column.