Are you trying to count the number of items in the text field? And items are separated by a semi-colon?

Try this formula:

IF(


    {fieldName},


    LEN({fieldName}) - LEN(SUBSTITUTE({fieldName}, ";", "")) + 1


)

This formula uses the trick of replacing the semi-colons with nothing and then comparing the length of the text string with the original length to determine the number of semi-colons. Since semi-colons are only in between values, you have to add one to the number of semi-colons to find the number of items.

IF(


    {fieldName},


    LEN({fieldName}) - LEN(SUBSTITUTE({fieldName}, ";", "")) + 1


)

The incredibly clever lengths we go to lacking a Split() function. I’m seriously impressed and dismayed at the same instant.