What is JotForm?
JotForm is a free online form builder which helps you create online forms without writing a single line of code. No sign-up required.
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Yes, that is possible, you can set that text field as Read-Only and use its value normally. To do that please follow:
1. Click on gear box on textbox field:
2. In Preferences page choose Advanced
And switch 'Read Only' option on.
That way, your field is read-only, nobody can change it, but you can show values, use them in calculations etc.
Hope it helps.
Please let us know if we can be of any additional assistance.