Kelly Criterion Calculator
Find the Kelly stake for a bet from the odds, your fair win probability and bankroll.
How it works
Kelly % = (b·p − q) / b, where b is decimal odds − 1, p the win probability and q = 1 − p. Full Kelly is aggressive and assumes your probability is exact; most bettors use a quarter or half. If the result is zero or negative, the bet isn't +EV at that price.
For information only. Math can't make a losing bet win. 21+.
Other calculators: No-Vig (Fair Odds) · Expected Value (EV) · Parlay