Can a custom error message be displayed if a calculated field exceeds a certain amount?

I have a calculated field in my form that adds up numbers entered in 8 separate fields.  I would like to display an error message if the calculation exceeds 100.

Hello DThalasitis,

Yes it is possible to achieve your requirement. 

Here are the steps you should follow:

#1. Add a "Text" field in your form to display the desired error message.

#2. Add condition in your form to check the calculated value and display the error message if it is equal to or exceeds 100. Please check the screenshot below:

Hope this helps.

Do get back to us if you have any questions.

Thank you!