Free calculator
Kelly Criterion Calculator
The mathematically optimal stake size.
Enter the odds, your true win probability, and bankroll to see the full, half, and quarter Kelly stakes.
Edge12.50%
Full Kelly8.3% · $83.33
½ Kelly (recommended)4.2% · $41.67
¼ Kelly (conservative)2.1% · $20.83
How does the Kelly Criterion work?
The Kelly Criterion sizes each bet to maximize long-term bankroll growth based on your edge. Full Kelly is aggressive and swingy — most sharp bettors use half or quarter Kelly to smooth variance while keeping most of the growth. If you have no edge, Kelly says bet nothing.
Sharp App does this automatically across 100+ sportsbooks and apps — see the EV Tracker.
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