Power BI DAX LOWER function is used to converts the given string into lowercase. Its comes under Text function Dax category.
Syntax:
LOWER(string)
Description:
S no. | Parameter | Description |
1 | String | The text you want convert into lowercase. |
Let’s start with an example:
Step-1: Sample Dataset as below:

Sample Dataset for DAX String Functions
Step-2: Create New column, right click on Dataset & click on New column.

Create New Column
Step-3: After that DAX formula screen appears.
Step-4: write DAX formula there to convert Product sub category column strings to lowercase & press enter.
LowerCase = LOWER(Orders[Product Sub-Category])
Step-5: Now Drag new column to Table visual & output as below.

Lower function Output
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