Ajuda com formulário de calculo!

Estou precisando usar um WINDGET associado com soma automática, onde deve-se calcular os campos e fazer uma soma total. Só que não consigo configurar uma calculadora. 

Poderia me ajudar? 

Is there any particular reason you cannot use "Form Calculation" widget in form? This will help you achieve your calculation requirement. You may like to take a look at the following guide which should help you:  https://www.jotform.com/help/259-How-to-Perform-Form-Calculation-Using-a-Widget

Please note that you can also add condition in your form for calculation and populate a regular "Short Text Entry" of form. The following guide should help you:  https://www.jotform.com/help/268-How-to-Insert-Text-or-Calculation-into-a-Field-Using-Conditional-Logic

Hope this helps.

Do get back to us if you have any questions.