How can I validate that a calculated field is a valid amount?

I am trying to use a calculated field as a validation for a form. i.e. if a calculated field is greater than x then validation error. I can't seem to find a way to do it.

You may setup a condition based on the values and the action that you want to take. If you want to display a message or hide a field on the form, you may try using shot/hide a field condition on the form.

https://www.jotform.com/help/316-How-to-Show-or-Hide-Fields-Base-on-User-s-Answer

If you are trying to achieve something different, please let us know. We will be happy to help.