Kelly Criterion Calculator
The Kelly criterion sizes each bet to grow your bankroll fastest without ruin. Enter your win probability, the odds, and your bankroll to get the optimal stake.
Enter your numbers above to see the result.
Worked example
A 55% edge at +100 odds on a $1,000 bankroll says bet 10% — $100 — at full Kelly. Most pros bet half-Kelly ($50) to smooth the swings.
FAQ
What is fractional Kelly?
Betting a fraction (often half) of the full Kelly amount. It sacrifices a little growth for much lower volatility and risk of ruin.
What if Kelly says bet zero?
A zero or negative Kelly number means you have no edge at those odds — the calculator clamps it to 0, i.e. don't bet.
We run this math on every game.
Every pick tiered, unit-sized, posted before games — and graded publicly when they end. Wins and losses, on the record, forever.
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