Calculating bankroll requirement/risk of ruin tool

[Perseus]

I saw a post last week that I can't find.

Someone had posted a link to a website where one can type in their bankroll and standard deviation to find thier risk of ruin. Likewise one could also type in their winrate and standard deviation and it showed required bankroll to elimate risk of ruin.

I've been searching for half an hour on this site and google and I can't find it. If anyone has the link please post.

Thanks,

Jon

google standard dev.