📈
Implied Probability Calculator
Convert betting odds to probability. Understand what chance the sportsbook is pricing into the line.
Enter Odds to Convert
Implied Probability
60.00%
Decimal Odds
1.67
Fractional Odds
2/3
What Is Implied Probability?
Implied probability is the likelihood of an outcome as suggested by the odds. It tells you what chance the sportsbook is giving that bet to win, including their margin (vig).
📐 The Formulas
Negative odds: |Odds| / (|Odds| + 100) × 100
Positive odds: 100 / (Odds + 100) × 100
Why This Matters
To find value, compare implied probability to your own estimate. If you think a team has a 50% chance but odds imply 40%, you have potential value. This is the foundation of profitable betting.
Quick Reference Chart
| American | Decimal | Implied Prob | Meaning |
|---|---|---|---|
| -300 | 1.33 | 75.0% | Heavy favorite |
| -200 | 1.50 | 66.7% | Strong favorite |
| -150 | 1.67 | 60.0% | Moderate favorite |
| -110 | 1.91 | 52.4% | Slight favorite |
| +100 | 2.00 | 50.0% | Even money |
| +150 | 2.50 | 40.0% | Underdog |
| +200 | 3.00 | 33.3% | Bigger underdog |
| +300 | 4.00 | 25.0% | Long shot |