Is it possible to create this loan calculator in Webflow?

I’m wondering whether it’s possible to create a calculator that calculates monthly repayment based on what users write/pick

See site below to see what I mean:

Here is my site Read-Only: Boat Finance Calculator - Jade Boat Loans

On plans that support custom code you can certainly build that type of functionality. If you are looking for third-party tools to do that for you please check the University within the integrations section.