Tools
Kelly calculator
Enter your bankroll, odds, and fair odds to calculate the optimal stake using the Kelly Criterion.
Kelly inputs
The Half Kelly (50%) is a safer balance of growth and volatility, keeping most of the long-term upside with lower risk.The Kelly Criterion sizes your bet based on your edge and odds. Half Kelly (50%) is a popular, safer choice that keeps most of the long-term growth with lower volatility.
How Kelly works
Estimate your edge — Compare your fair odds (or win chance) to the bookmaker's odds.
Choose your risk level — Use Full, Half (recommended), or Quarter Kelly based on your risk tolerance.
Get your stake — We calculate the optimal bet size that maximizes long-term growth.
The formula: full Kelly stakes (our chance × odds − 1) ÷ (odds − 1) of your bankroll. Half and Quarter Kelly take that share of it.
Quick examples
Kelly result
+EVStake
$1,202
Stake %
of bankroll
Expected
growth
Edge
Fair odds
(our model)
Market odds
(bookmaker)
Risk level