calculator
EV Calculator
Use your win probability and the posted odds to estimate expected value and ROI.
Expected value (EV)
Enter stake, American odds, and your win probability.
Win profit: —
EV: —
ROI: —
Why EV is the whole game
If you’re not thinking EV, you’re betting blind.
EV tells you what you “should” win or lose on average over time based on your probability estimate. A bet can lose today and still be a great bet if the EV is positive.
This is how sharp betting actually works:
- Find edges (your probability higher than the market implies)
- Bet them consistently with solid sizing
- Let volume + math do the work
Mini FAQ
What’s a “good” ROI? Even 2–5% is strong long-term if it’s real.
Can my win% be wrong? Yes — be conservative. Overconfidence kills bankrolls.