Hi @tumisomahlake
You are referencing the field itself in the formula, which is why you are seeing the loop error:

The API name for a field must be unique on the object - does your original “Total Authorised Committed” field have the same API name perhaps? Update the API name on the % field, and then it should work.
Thank you. The formula is working.
Good day @petegush
How do I change the Percentage? Error to 0 when there are no values entered.

Hi @tumisomahlake
You can wrap the formula in the CATCH function, which will return a default value if the formula results in an error.
For eg, to return a blank value instead of an error when dividing by zero try
Catch($FieldA/$FieldB, NULL)
where $FieldA/$FieldB is your formula.