Kelly Criterion Calculator

Kelly Calculator Info

The Kelly Criterion is a mathematical formula used to determine the optimal fraction of a bankroll to wager on a bet, with the goal of maximizing long-term wealth growth. Since the true probability of a wagering event is usually a best estimate, full kelly (1.0) is not likely a good idea. Quarter kelly (0.25) might be advised.

Probability
The probability the bet wins.
Odds
The odds of the bet.
Kelly Multiplier
The fraction of the Kelly calculation to wager, [0.0, 1.0].
Bankroll
Total supply of money allocated to wagering.
Odds Format
Specifies the format used in odds fields.

Math

f=edgeodds=bp-qb=p-qb
f
The fraction of your bankroll to bet.
edge
The edge as a decimal.
odds
The net fractional odds of the bet.
b
The net fractional odds of the bet.
p
The probability the bet wins.
q
The probability the bet loses.

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