Odds Express a Break-Even Point
Every price implies the win rate needed to break even before accounting for sportsbook hold. Negative odds require a higher hit rate than plus-money odds.
For example, a favorite priced around -110 needs to win a little more than half the time to break even, while a plus-money selection can be profitable at a lower hit rate if the price is strong enough.
Models Look for Price Versus Probability
A betting model is not only asking who is likely to win. It is asking whether the available price is attractive relative to the model's estimated probability and the broader market context.
That comparison is why two games with similar teams can lead to different decisions. The price matters.
Market Context Still Matters
Implied probability is one input. A disciplined process can also account for data quality, matchup context, timing, market type, model confidence, and production thresholds.
A selection should qualify only when the overall standard is met. A small theoretical edge may not be enough to justify a play.
Convert American Odds and Recognize the Margin
For positive American odds A, raw implied probability is 100 / (A + 100). For negative odds, use their absolute value B: B / (B + 100). Thus +150 implies 40%, -150 implies 60%, and -110 implies about 52.38%. These are break-even prices, not proven true probabilities.
If both sides of a two-way market are -110, their raw probabilities total 104.76%. Dividing each side by the total gives 50% per side under a simple proportional margin-removal method. Other methods differ, and removing margin does not make the estimate certain. Compare matching markets and timestamps.
Key Takeaway
ESA uses market price as part of a broader production framework, while keeping the exact proprietary model logic private.