Free tool
Odds, EV & Half-Kelly Calculator
Convert American odds, see implied probability, expected value, and a half-Kelly stake suggestion.
Decimal odds
1.909
American odds
-110
Implied win %
52.38%
Your edge vs market
+2.62%
EV on this stake
$5.00 (+5%)
If this wins
+$90.90 profit
½-Kelly stake
$27.50 (2.75% of bankroll)
If this loses
−$100.00
Educational only — not betting advice. Fair win % is your estimate; bad inputs produce bad EV. Half-Kelly is a common risk-reduction heuristic, not a guarantee. 18+ only.
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