[Forminator Pro] Add comma to calculation field number in forminator pro

Hi There,
I have a lot of calculations on the form on my site and they are all currency. I found a thread with how to fix it so the decimal point shows as xx.00 here –
https://premium.wpmudev.org/forums/topic/forminator-calculations-output/
I also need the number formatted as currency so a comma is added – ie when the result is 2015.00 I would like it displayed as 2,015.00. Please can you let me know how to do this?
The form is on this page – https://dev.niftymarketing.co.uk/devcloud9insight.com/budget-checker/
Thanks so much!