Can you have a field do a total calculation?

In form below is there a way to auto calculate the "TOTAL # of people attending field trip (must equal three fields above):" from previous 3 fields?

Hi,

You can use our Calculation Widget for that purpose: https://www.jotform.com/help/259-How-to-perform-calculation-in-the-form.

Or, you can do it in the conditional logic so you don't need to update/replace the field. Here's how: https://www.jotform.com/help/268-How-to-Insert-Text-or-Mathematical-Caculation-into-a-field-using-a-Condition. Just simply sum the input of all the fields, you can use the following rules:

Let us know if you have any further questions.

Thank you!