EV Calculator
Calculate expected value from any American odds. Know your edge before you bet.
Don't know the fair probability? Switch to From a sharp line — we'll remove the vig from a sharp two-way line to find it for you.
Enter odds to see your edge.
Frequently asked questions
What is expected value (EV) in betting?
Expected value is the average profit or loss a bet would return if you could place it many times. A positive EV (+EV) bet is one where the odds offered are better than the true probability of the outcome, so it makes money over the long run.
How do you calculate EV on a bet?
EV% = (fair win probability × decimal odds) − 1. Enter your American odds and your estimate of the true probability and this calculator returns the EV percentage and the profit per $100 staked.
How do you find the fair probability?
A common method is to take a sharp book like Pinnacle, remove its vig from both sides of the market, and use the resulting no-vig probability as your fair estimate. The both-sides mode does this for you.
What counts as a good EV percentage?
Many sharp bettors act on edges of roughly 1–3% and above. Small edges are still profitable over a large sample, provided your probability estimate is accurate and you bet enough volume.