### Instructions

First select one of the two radio buttons. If you want to calculate your bankroll
requirement given your win rate, standard deviation, and desired risk of ruin, select
the "Bankroll" button. Otherwise, select the "Risk of Ruin" button to calculate
your risk of ruin given your bankroll, win rate, and standard deviation.

Enter your information and click the calculate button. Note that only three of the four
textboxes are active. The active boxes depend on which type of calculation you select. You
must follow these guidelines for your entries:

- Win Rate: must be a number greater than 0.
- Std. Dev.: must be a number greater than 0.
- Bankroll: must be a number greater than 0.
- Risk of Ruin: must be a number greater than 0.0 and less than 1.0.

Example: if you
are willing to accept a risk of ruin of no more than 1%, enter 0.01 in this box.

Note that no units are expressed in the program. So long as you use consistent units,
the answers will be correct in the same set of units.

This program uses the following equations:

B= -(σ²/2u)ln(r)

r= exp(-2uB/σ²)

Where u is win rate, σ is standard deviation, r is risk of ruin, and
B is bankroll.

These equations were derived
by 2+2 poster BruceZ.

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© 2006 by uDevil