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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I checked your form and there's no Calculator widget added on it. Here's a guide how to add a widget:
1. Go to the More Fields tab, type and search for the Calculator widget. Drag and drop it to your form.
2. In the Calculator widget wizard, you can enable or disable the Auto-hide calculator number pad and change theme. Click the Add widget button when you're done.
Hope that helps. Let us know if you need further assistance. Thank you.