I’d use observable. Here is an example of a mortgage calculator https://observablehq.com/@observablehq/modeling-in-observable https://observablehq.com/@observab

I’d use observable. Here is an example of a mortgage calculator https://observablehq.com/@observablehq/modeling-in-observable https://observablehq.com/@observablehq/modeling-in-observabl... . And you can create a page to collect all your calculators (other observable pages).