You can ignore this field if you don't understand it. Total standard deviation = This is a measurement of the volatility you can expect.When the input looks correct, click calculate and the calculator will tell you: You will have to put in the hours played yourself. If you feel any of these are inaccurate, change them as you wish. That choice will propagate the hands per hour, house edge, and standard deviation fields. To use the calculator, select a game from the pulldown menu. In other words, the calculator is meant to advise how many betting units the player should bring to the table. The calculator assumes if the player ever goes negative before his session is over, then he must walk away broke. This purpose of this page is to calculate the session probability of ruin, given the bankroll, game, hours played, and hands per hour.
On this page Session Risk of Ruin Calculator Introduction