**Kneal**- JotForm Support
**Jan**You can calculate fields using the Form Calculation widget. These are sample form templates that are using calculations.

Please check this guide to know more about calculations:

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

http://www.jotform.com/blog/97-Introducing-Field-Calculations-for-Forms