I had an issue with the plugin running the jump calculator. I really don’t know when it failed, but the plugin wrecked the site for a minute.
2026 is the 10 year anniversary of the Jump Calculator!
Though it began in 2014/15, 2016 it went live:
AND thank goodness for the WAY BACK MACHINE: https://web.archive.org/web/20160319230759/http://trailism.com/trail-science/jump-design/
Here is another solution with a graph for now: https://www.desmos.com/calculator/jjphayymiy