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Expected Value (EV) Calculator

Enter your odds, your estimate of the true win probability, and your stake — and see if the bet is +EV in dollars and percent.

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Expected value
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EV % of stake
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Your edge vs price
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Implied prob (with vig)
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EV = (win% × profit) − (lose% × stake). "Your edge" compares your probability to the price's implied probability. If it's positive, the bet is +EV.

Don't know the true probability? Our model does.

BetBetter's calibrated model estimates the real win chance for every market and surfaces the +EV ones. See tonight's edges — free.

View today's +EV bets

Expected value — quick answers

What is +EV?

A bet whose average outcome is a profit if repeated many times. It's the only thing that matters long term — win rate alone doesn't.

How do I get my win probability?

Use the fair no-vig price as the market's estimate, or a calibrated model. If your probability beats the fair implied probability, you have +EV.