Identify when bookmaker odds offer genuine positive expected value compared to true probability.
A value bet occurs when the bookmaker's odds imply a lower probability of winning than your own assessment. If you believe an outcome has a 40% chance of occurring but the bookmaker offers odds implying only 30%, you have found positive expected value.
Formula: Value = (Your Probability × Decimal Odds) − 1. A positive result means the bet has value.
Value betting only works long-term if your probability estimates are accurate. Overestimating your edge is the most common mistake. Compare your probability to multiple bookmakers and sharp exchanges to calibrate your estimates.
Matched betting gives guaranteed short-term profit but requires free bets to sustain. Value betting has variance (you'll have losing runs) but can be profitable indefinitely from a single account — bookmakers are slower to limit value bettors than arbers.