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繁體中文Expected Value Explained
Expected value (EV) measures the long-term average result of a bet. This guide explains it with hypothetical examples only.
- Expected value (EV) is what a bet would return on average if repeated many times.
- One whose price beats the true probability of the outcome, making it favourable over the long run, even though any single bet can lose.
- No.
What EV is
EV is what a bet would return on average if you could repeat it many times. Positive EV (+EV) means a favourable bet long term; negative EV (-EV) means an unfavourable one.
The idea behind it
EV weighs the size of a win against its probability.
Positive vs negative EV
Most casino games are -EV because of the house edge. In betting, +EV bets exist when a price beats the true implied probability.
Long-term, not per-bet
EV describes the long run; any single bet can lose. Variance is real, so even +EV bets need a bankroll to ride out swings. Bet responsibly.
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🔞 18+ only. Examples are hypothetical and for explanation only — they are not betting advice or real odds. Please gamble responsibly.
FAQ
Expected value (EV) is what a bet would return on average if repeated many times. Positive EV is favourable long term; negative EV is unfavourable.
One whose price beats the true probability of the outcome, making it favourable over the long run, even though any single bet can lose.
No. EV describes the long-run average; any single bet can lose to variance, which is why a bankroll matters.
Last updated: 2026-06-15