Free Expected Value (EV) Calculator for Sports Betting

Q: What is expected value in betting?

Expected value is the average amount a bet wins or loses if you placed it many times. Positive EV means the bet profits long term; negative EV means it loses, even if it can win once.

Q: How do I calculate the EV of a bet?

Multiply your win probability by the profit if you win, then subtract your loss probability times your stake. The calculator does this instantly from the odds, your probability, and your stake.

Q: How do I find my true win probability?

The most reliable way is to take the no-vig fair price from a sharp sportsbook. Enter both sides of the market into a no-vig calculator to get the vig-free probability.

Q: Is +EV betting profitable?

It can be, over a large sample. Any single +EV bet can lose, but consistently betting positive EV prices is the mathematical basis of long-term profit.

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Get Your Results

Check whether any bet is positive EV before you place it.

How It Works

Enter the odds you are getting, your true win probability, and your stake. The calculator returns:

Expected value in dollars, green for positive, red for negative
EV per $100 and your edge as a percentage
The break-even win rate the odds require
The fair odds at your win probability

If you are not sure of your true probability, pull the fair price from a sharp sportsbook or strip the vig with our no-vig odds calculator.

What Expected Value Means in Betting

Expected value is the average result of a bet if you could make it thousands of times. A positive EV bet makes money over the long run even though any single bet can lose. The math is simple: multiply your win probability by the profit if you win, then subtract your chance of losing times your stake. If that number is above zero, the bet is +EV. The entire edge in sports betting comes from consistently finding prices where your true probability beats what the odds imply.

When to Use an EV Calculator

Before placing any bet, to confirm the price actually beats your estimated win rate
Comparing the same bet across sportsbooks to see which price carries the most value
Checking whether a promo, boost, or bonus bet is genuinely +EV once you account for terms
Sanity-checking a bet you feel good about against the cold math

Positive expected value is the foundation every serious tool is built on, which is why our positive EV betting tools automate this across thousands of markets at once.