EV Calculator
Calculate expected value and Kelly sizing for any bet
Odds format
-110 · 1.91 · 52.4%
55%
✅ Positive EV
Your win estimate beats the price by +2.6 pts. EV is +5.0 per $100 staked.
EV per $100
+5.0
Break-even prob
52.4%
win rate to not lose
Implied prob
52.4%
from price (incl. vig)
Edge over market
+2.6 pts
Kelly sizing
Full Kelly
$55.00
5.5% of bankroll
Half Kelly
$27.50
2.8% of bankroll
Quarter Kelly
$13.75
1.4% of bankroll
Eighth Kelly
$6.88
0.7% of bankroll
Kelly maximizes long-run growth but assumes your win probability is accurate. Most bettors use Quarter or Eighth Kelly to cut variance. Bet responsibly. 21+
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