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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This option is useful when you wanted to perform some calculations on your JotForm. You can assign the calculation values for the dropdown items so that these values are used when some calculation is done using calculation widget this field.
Please refer to the guide below that can help you in assigning calculation values to the fields.
The guide How-to-perform-calculation-in-the-form can help you with doing calculations on your JotForm.
Hope this information helps! Let us know if you need any further assistance. We will be happy to help.