Beginner-friendly betting tool

Expected Value Calculator

See whether the price on a bet is favorable over the long run. Enter what you believe the chance of winning is, the sportsbook’s American odds, and how much you plan to bet.

Enter your bet

Not sure what something means? The short explanations below each box will guide you.

Chance of winning Your estimate %

Example: enter 55 if you believe this bet wins 55 out of 100 times.

American odds From your sportsbook ODDS

Examples: favorites often look like −110; underdogs may look like +150.

Bet amount Your planned risk $

This changes the dollar result, but it does not change whether the bet is positive or negative EV.

Your result

These numbers describe the average outcome over many similar bets—not a guarantee for this one bet.

Plain-English answerEnter your bet to begin

Expected value per bet—

Expected ROI—

Break-even win rate—

Profit if this bet wins—

Fill in the three boxes, then press Calculate EV.

What does EV mean?

Expected value is the average amount you would expect to win or lose per bet if you could repeat the same situation many times. Positive EV means your estimated chance of winning is better than the sportsbook price requires. Negative EV means the price does not appear favorable. A positive result can still lose today, and an inaccurate win-probability estimate will produce an inaccurate EV result.