How to update a form field value using conditions?

I just had a quick question about a widget that I have not come across yet. I'm trying to create a form that as you put values in it, the values in another box change similar to functions in excel. I really just need to do two simple calculations. Basically the amount of the product is entered and I want have the price right next to it when they enter a value by multiplying that number by the price per unit. If this is something that is possible that would be great. Thanks!

Yes, this is possible.

Here's a Demo: Please feel free to clone it.

http://form.jotformpro.com/form/51617972326965

And this can be done using the Condition Wizard.

Saved Conditions sample

You may also check this guide for your reference: Smart-Forms-Using-Conditional-Logic

Another thing, this can also be done using the Payment tools: 

You may use this guide for your reference: Setting-Up-Your-First-Order-Form

Here's another demo: http://form.jotformpro.com/form/51617738300957

I hope this helps. Let us know if you need further assistance and/or clarifications with instructions above. Thank you.

@stormingrobots

I have moved your concern to a new thread considering this is already an old thread and to ensure that you will be properly assisted.

Please click this link to go to that new thread.

Thank you.