I have now turned my compound interest calculator into a Pluto notebook, where the reactivity makes it really easy to explore input changes. The novelty is that you can quickly solve for any variable in the equation. Most online calculators I found will only solve for F.
You will probably want to download and run it locally because I cannot get it to precompile on Binder. 
I’m still brand new to SciML, so tips are welcome. Enjoy!