Odds Probability & Margin
Convert odds, estimate implied probability, and measure or remove bookmaker margin. Every tool is designed for a focused calculation and a straightforward browser workflow.
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Odds are prices, and the first useful step is often to translate those prices into probabilities. This section brings together implied-probability, fair-odds, bookmaker-margin, overround, vig, no-vig, edge, and confidence tools. They help separate the market price from your own estimate of an outcome, which makes it easier to see whether an apparent value bet still looks attractive after the bookmaker's margin is removed.
Probability work becomes unreliable when the inputs are treated as more precise than they really are. An implied probability calculated from decimal odds is exact for that quoted price, but your own win probability is still an estimate. When comparing the two, try a range rather than a single number. That is especially important in markets with several outcomes, where the total margin must be distributed across all selections before a fair-price comparison makes sense.
Practical tips
- Convert every selection in a market before judging the bookmaker's total margin.
- Remove vig before comparing a market probability with your own model probability.
- Run a sensitivity check around your estimated win rate instead of relying on one precise percentage.
- Keep odds and probability formats consistent when moving numbers between tools.
- A positive calculated edge is not a guarantee of profit; it only describes the relationship between your estimate and the offered price.