Has anyone built a debt snowball caculator?
Dana J. 
Not yet but I have often thought Bubble would be a great place to do such a thing. Are you looking to build one?
That’s it.
Yes, I need one but it’s a little complicated to build so I hope someone has already done it and I could copy their code and use it on my site so I look brilliant.
Sounds like a doable and fun project. Best of luck with it!