Startup Growth Calculator - https://news.ycombinator.com/item?id=8040448 - July 2014 (30 comments)
and a bit more:
Startup Growth Calculator - https://news.ycombinator.com/item?id=16802351 - April 2018 (1 comment)
Startup Growth Calculator – if nothing changes, are you alive or dead? - https://news.ycombinator.com/item?id=10766922 - Dec 2015 (1 comment)