How to get the sum of numbers in configurable list widget?

I am using the configurable list widget to calculate the number of units used in a botox treatment.

The widget allows you to add multiple lines and add quanity used. Is there a calculation I can use that adds up all the lines? 

I have tried the calculation field but I'm getting very unusual results.

I would love your assistance with this :)

Unfortunately, it is not possible to use calculations with the configurable list widget. It is required to use separate fields in order to calculate the sum. 

https://www.jotform.com/help/259-How-to-Perform-Form-Calculation-Using-a-Widget 

You may also show/hide the fields on the form based on conditions. Please refer to the guide below that can help you with this.

https://www.jotform.com/help/196-Hide-or-Show-Multiple-Fields-at-Once

Hope this information helps! Please give it a try and let us know if you need any further assistance. We will be happy to assist. 

Thank you so much for your reply - I thought that might be the case and appreciate you looking into it - I think my work around would be as you suggested and use conditions. :)