📊 EV Calculator
Calculate expected value and Kelly criterion stake for any bet.
Your Inputs
%
1%50% (coin flip)99%
$
+EV
This bet has positive expected value — you have an edge!
EV per $100
+$5.00
EV for $100
+$5.00
Your Edge
+2.6%
Implied Prob
52.4%
Kelly Criterion Stake
Full Kelly
5.5%
of bankroll
Half Kelly (Safer)
2.8%
of bankroll
How it works: EV = (Win Probability × Profit) − (Lose Probability × Stake). A positive EV means you have a mathematical edge over the long run. Kelly Criterion recommends the optimal bet size to maximize bankroll growth.