does jotForm support calculated fields? e.g. display a progressive total

Hello,

Thank you for contacting us.

Of course, you can have calculated fields in your forms, please refer to this guide, there you will find further assistance about calculated fields : 

http://www.jotform.com/help/259-How-to-perform-calculation-in-the-form

I hope that helps.

If you need more help, feel free to contact us.

Regards.