Implied Probability Calculator
Turn any odds into the win probability they imply. Add the other side of the market to see how much vig the book is charging and the fair, no-vig probability.
Side A implied
52.38%
Side B implied
52.38%
Vig (overround)
4.76%
No-vig A
50.00% (+100)
No-vig B
50.00% (+100)
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How to convert odds to implied probability
- Negative American odds. Implied % = odds ÷ (odds + 100), using the absolute value. -150 → 150 ÷ 250 = 60%.
- Positive American odds. Implied % = 100 ÷ (odds + 100). +150 → 100 ÷ 250 = 40%.
- Decimal odds. Implied % = 1 ÷ decimal. 2.50 → 40%.
- Remove the vig. Divide each side's implied % by the sum of both sides to get fair probabilities that add to 100%.
American odds to implied probability chart
| American | Implied probability | Decimal |
|---|---|---|
| -500 | 83.33% | 1.20 |
| -300 | 75.00% | 1.33 |
| -200 | 66.67% | 1.50 |
| -150 | 60.00% | 1.67 |
| -110 | 52.38% | 1.91 |
| +100 | 50.00% | 2.00 |
| +120 | 45.45% | 2.20 |
| +150 | 40.00% | 2.50 |
| +200 | 33.33% | 3.00 |
| +300 | 25.00% | 4.00 |
| +500 | 16.67% | 6.00 |
| +1000 | 9.09% | 11.00 |
Compare live markets' vig on the odds board or use the no-vig calculator for fair odds.
FAQ
What does implied probability mean?
It is the win probability at which a bet breaks even. If you think the true chance is higher, the bet is +EV.
Why do both sides add up to more than 100%?
That excess is the bookmaker's margin (vig or juice). A -110/-110 market totals 104.76%, a 4.76% overround.
What is no-vig probability?
The implied probabilities rescaled so they sum to 100%. It is the market's best estimate of the fair chance.
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Put the math to work: live odds board · +EV finder · weekly line movement report.