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Kelly Calculator
Estimate full, half and quarter Kelly position sizes from the price, your probability and your bankroll.
YES share price, 1–99¢
Full Kelly
20% · $200.00
Half Kelly
10% · $100.00
Quarter Kelly
5% · $50.00
Kelly sizing assumes your probability is accurate. Most people use a fraction of Kelly to limit risk.
Results are for education only and are not financial advice. Prediction markets involve risk.