JotForm is a free online form builder which helps you create online forms without writing a single line of code. No sign-up required.
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It depends on how your form is setup.
You can setup an order form by following this guide: http://www.jotform.com/help/165-Setting-Up-Your-First-Order-Form
Stripe is one of our payment tools that you can integrate on your form. If you wish to have a custom price depending on the calculations on a text box or options in your other fields. You can do that by following the guides below:
To perform a calculation, you can follow this link: http://www.jotform.com/help/259-How-to-perform-calculation-in-the-form
If you are using drop downs, radio buttons and check boxes, you can assign calculation value on them by following the steps here: http://www.jotform.com/help/301-How-to-Assign-Calculation-Value
After having a final calculation for your custom price, you can pass it to your payment integration by following this guide: http://www.jotform.com/help/275-How-to-pass-a-calculation-to-a-payment-field
I hope that helps. If you have not yet registered an account, please do so. That will allow you to manage your forms and take advantage our features and services fully.