By Calculated Fields, you can create calculations in your form quickly and conveniently. The plugin supports various mathematic operators for any of your calculating needs.
Example: Below is a procedure how to creat a bill calculation.
Firstly, we create a simple form which allow customers to choose product, size and quantity.
Set Total field to Calculated type, the control section would be showed as below:
In the Calculation control field, add your mathematic fomula. Shortcode of fields would be used as variables.
After choose product, size and quantity, Calculated Fields will automatically calculated total amount.