What are implied odds in sports betting?

Implied odds represent the probability of an outcome as suggested by the betting odds. For example, -200 American odds imply a 66.67% chance of winning. Sportsbooks build in a margin (vig), so implied probabilities across all outcomes will sum to more than 100%.

How do you calculate implied probability from American odds?

For negative American odds: Implied Probability = |Odds| / (|Odds| + 100). For positive American odds: Implied Probability = 100 / (Odds + 100). For example, -150 implies 150 / 250 = 60%, and +200 implies 100 / 300 = 33.33%.

How do you calculate implied probability from decimal odds?

Implied Probability = 1 / Decimal Odds. For example, decimal odds of 2.50 imply a probability of 1 / 2.50 = 40%. Decimal odds of 1.50 imply 1 / 1.50 = 66.67%.

Why do implied probabilities add up to more than 100%?

The amount over 100% is the sportsbook's margin (vig or juice). If a two-way market's implied probabilities sum to 105%, the book has a 5% edge. Use our No-Vig Calculator to remove this margin and see the true fair probabilities.

How do I use implied odds to find value bets?

Compare the implied probability from the odds to your own estimated probability. If you believe a team has a 55% chance of winning but the implied odds only suggest 45%, that's a value bet. The bigger the gap, the more edge you have.

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Implied Odds Calculator

Convert any odds format to implied probability instantly.

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How to Use This Calculator

Select your odds format (American, Decimal, or Fractional)
Enter the odds for the outcome you want to evaluate
The calculator converts to implied probability and all other formats
Compare the implied probability to your own estimate to find value

Understanding Implied Odds

Implied odds tell you the probability a sportsbook is pricing into their line. When you see -150 on a team, the book is saying that team has roughly a 60% chance of winning. Understanding this is the first step to finding value bets.

The formula is straightforward: for decimal odds, divide 1 by the odds. Decimal odds of 2.00 mean a 50% implied probability. For American odds, the math differs for favorites and underdogs but the concept is the same.

Sharp bettors constantly convert odds to probabilities. If a book implies 45% on an outcome but your model says 55%, that's a 10% edge — a significant value opportunity. This calculator saves you the mental math so you can focus on finding those edges.

Implied Probability = 1 / Decimal Odds

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