Form fields calculation

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I can't figure this out and it's driving me crazy. I want to have a form where the user inputs 2 dates and then I run a few relatively simple calculations on the backend and immediately / live display the results. Something like: my birthday is X and a big event is on Y, tell me how many days until the event. Any ideas on how to do this? I can use Glideapp, but then I would have to add sign-in or have everyone overwriting data. I don't know how to use Bubble. Airtable forms won't show calculated fields.

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