Enter your probability estimate and the bookmaker's odds. We'll tell you instantly if there's value — and exactly how much edge you have.
BetMan's Professional Calculator adds Kelly Criterion staking, arbitrage finder, and full bet tracking — all free.
A value bet exists when the bookmaker's implied probability is lower than your assessed true probability. The bookmaker is underestimating the likelihood of an outcome — and that gap is your edge.
If Bet365 prices Arsenal at 2.10 (implied: 47.6%), but your analysis says Arsenal win 55% of the time, you have a +7.4% edge. That's a value bet.
Over hundreds of bets, positive edge compounds into profit — regardless of individual results. Value betting is the only mathematically sustainable approach to sports betting.
Step 1 — Estimate the true probability. This is the key skill. Use recent form, xG data, head-to-head records, and injury news to arrive at your own probability estimate for the outcome.
Step 2 — Enter the bookmaker odds. Find the best available odds (always compare across bookmakers). Enter in decimal, fractional, or American format.
Step 3 — Read the result. If Edge is positive and EV is positive, you have a value bet. Our threshold: we consider >5% edge worth betting.
This calculator uses the same methodology documented in our editorial methodology page. Our value threshold is set at >6% edge divergence.