How to create similar form to set minimum price?

I am trying to do something similar to that in the url 

Hello oklife,

All the steps as mentioned in my answer on other thread is still valid but since the UI is changed, let me explain it here again. Here are the steps you should follow:

#1. Add a hidden "Form Calculation" widget in form to calculate the amount. This widget should be hidden so that users are not able to see this field in form.

#2. Add another form calculation widget or textbox in form to display the amount which you need to charge customer. Please check the screenshot below:

#3. Add condition in form to check the calculated value of hidden widget and if it below certain amount, then you should add the minimum amount in the visible textbox or widget. Please check the screenshot below:

#4. Add another condition in form to check the calculated value of hidden widget and if it more than the certain amount, populate the same amount in the visible textbox or widget. Please check the screenshot below:

Here is the form URL which you may like to take a look:  http://www.jotformpro.com/form/43104816734957 

I would suggest you to please clone this form for a closer look. The following guide should help you in form cloning:  https://www.jotform.com/help/42-How-to-Clone-an-Existing-Form-from-a-URL 

Hope this helps.

Do get back to us if you have any questions.

Thank you!

Thanks for the help. Is it possible to change it to a certain amount of fields were filled instead  of minimum price. Thanks.

If I understand your latest question correctly, you want the value of amount fields to be populated with value from other fields.

This is very much possible. Please refer to the user guides below on how it can be done.

#1 How-to-Pass-Field-Value-to-Another-Field

OR

#2 How-to-Pass-a-Form-s-Calculated-Value-to-another-Form-s-Payment-Total-Field

Let us know if there is  more we can help you with.

Thanks.