Free Tool · Betting Math

Expected Value (EV) Calculator

Estimate the expected value of a bet from your win probability and the offered odds.

The calculatorLive · no signup
Expected Value
+$10.00EV / $100
+$10.00EV on Stake
50.0%Break-even Prob
+5.0%Edge
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Your edge vs the break-evenedge +5.0 pp · EV +$10.00 / $100
0%25%50%75%100%BREAK-EVEN50.0%YOUR WIN %55.0%PROBABILITY →
Frequently asked2 questions
What is positive EV?
When your estimated win probability is higher than the odds' implied probability, the average outcome is a profit, positive expected value.
Where do I get the win probability?
From your own model or a de-vigged fair line. The no-vig calculator can turn a market into a fair probability.
More free toolsBetting calculators
Parlay Calculator→Combine multiple bets into one parlay and see the combined odds, total payout, and implied probability.Bet Calculator→Enter your odds and stake to see the exact payout, profit, and implied probability of a single bet.Odds Converter→Convert betting odds between American, decimal, and fractional formats, and see the implied probability.No-Vig Fair Odds Calculator→Remove the sportsbook's margin from a two-way market to get the fair odds and fair probability.Arbitrage Calculator→Check whether two prices form an arbitrage and get the stake split for a positive return on every outcome.Kelly Criterion Calculator→Find the bankroll-optimal stake from your win probability and the odds, with fractional-Kelly options.

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Expected Value (EV) Calculator | Courtside