Expected Value Calculator

Calculate the expected value of any bet. A +EV bet means you profit over time. A -EV bet means the house wins. EV is the foundation of profitable betting.

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Formula

EV = (p × profit) − (q × stake)

EV = (0.45 × $150) − (0.55 × $100)

Expected Value Per Bet
+$12.50
+12.5% ROI+EV
Breakeven Win Rate
40.0%
You need 40.0% to break even
Your Edge
+12.5%
vs implied probability
EV per $100
+$12.50
standardized EV
After 1,000 Bets
+$12,500
expected profit

Win Rate vs Breakeven

0%Breakeven: 40.0% | Your prob: 45%100%
Learn what expected value means and why it matters →