What does the Edge / EV Calculator do?

The Edge / Expected Value (EV) Calculator is a free sports betting tool for U.S. bettors that helps you measure your advantage or disadvantage on any wager. By entering your estimated probability of winning and the American odds offered by a sportsbook such as FanDuel, DraftKings, BetMGM, or BetOnline, the calculator instantly shows your expected value (EV) — your projected long-term profit margin on the bet.

How do you calculate your Edge?

The formula for calculating your betting edge is: Edge (%) = (Probability × Decimal Odds) − 1. Here, Probability is your personal projection of the chance that your bet wins, and Decimal Odds are the converted odds from the sportsbook’s American line. If the result is positive, you have a +EV bet — meaning your expected return is profitable over time. A negative result means the wager is priced against you.

How does this calculator help me?

The EV Calculator helps bettors make data-driven decisions instead of guessing. By comparing your projected probabilities with the odds being offered, you can instantly tell whether a line has value or not. It’s especially useful for sharp bettors who build models or track results across sportsbooks. Quantifying your edge helps you size bets smarter and manage bankroll risk with confidence.

Why does it say “Edge / EV”?

In sports betting, Edge and Expected Value (EV) mean the same thing when expressed as a percentage. EV represents your average outcome per dollar wagered — it can also be shown as a dollar amount or multiplier. When your EV is positive, you’re betting with an edge; when it’s negative, the sportsbook has the edge.

Bettor Ed EV/Edge Calculator

Enter the probability of winning and the American Odds to get EV

Frequently Asked Questions

Find answers to commonly asked questions about the EV Calculator

What does the Edge / EV Calculator do?
- The Edge / Expected Value (EV) Calculator is a free sports betting tool for U.S. bettors that helps you measure your advantage or disadvantage on any wager. By entering your estimated probability of winning and the American odds offered by a sportsbook such as FanDuel, DraftKings, BetMGM, or BetOnline, the calculator instantly shows your expected value (EV) — your projected long-term profit margin on the bet.

How do you calculate your Edge?
- The formula for calculating your betting edge is:
  Edge (%) = (Probability × Decimal Odds) − 1
- Here, Probability is your personal projection of the chance that your bet wins, and Decimal Odds are the converted odds from the sportsbook’s American line.
  If the result is positive, you have a +EV bet — meaning your expected return is profitable over time. A negative result means the wager is priced against you.

How does this calculator help me?
- The EV Calculator helps bettors make data-driven decisions instead of guessing. By comparing your projected probabilities with the odds being offered, you can instantly tell whether a line has value or not. It’s especially useful for sharp bettors who build models or track results across sportsbooks. Quantifying your edge helps you size bets smarter and manage bankroll risk with confidence.

Why does it say “Edge / EV”?
- In sports betting, Edge and Expected Value (EV) mean the same thing when expressed as a percentage. EV represents your average outcome per dollar wagered — it can also be shown as a dollar amount or multiplier. When your EV is positive, you’re betting with an edge; when it’s negative, the sportsbook has the edge.