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I think you're referring to the demo form in the page for the Calorie Intake Calculator widget: https://widgets.jotform.com/widget/calorie_intake_calculator
Here is also the link to the demo form: http://form.jotformpro.com/form/52220713451948
You may add the widget to your form by following the steps on this guide: How-to-Add-a-Widget-to-your-Form
You can also clone the demo form by following this guide: How-to-Clone-an-Existing-Form-from-a-URL
Hope this helps.