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Kelly Criterion Calculator
Optimal position size from your probability, the market price and your bankroll.
Kelly fraction
Edge
+10.0pp
Kelly fraction of bankroll
10.0%
Suggested stake
$100.00
Kelly assumes your probability is exactly right. Most professionals size at half-Kelly or less.
Want the probabilities filled in for you?
The Predite scanner estimates probabilities with AI across live markets and flags the edges automatically.
Start scanning →Educational tools — not financial advice. Prediction markets involve risk of loss.