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Odds Converter & Implied Probability Calculator
Type odds in any format and the rest update instantly. Works for sportsbook lines, DFS breakevens and prediction-market prices.
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| American | Decimal | Fractional | Implied probability |
|---|---|---|---|
| — | — | — | — |
Remove the vig (two-way market)
Both sides in American odds, e.g. -110 / -110 or -150 / +130.
| Implied | No-vig | Fair American | Fair decimal | |
|---|---|---|---|---|
| A | ||||
| B |
How to use this calculator
Choose the format you have, type the number, and read the other formats in the green line and table. To find the fair price of a bet, enter both sides of a two-way market (like a spread at -110 / -110 or a moneyline at -150 / +130) in the vig section: the no-vig column is the market’s true probability. Copy the result to share a conversion.
Common odds conversions
| American | Decimal | Fractional | Implied |
|---|---|---|---|
| -200 | 1.50 | 1/2 | 66.67% |
| -150 | 1.67 | 2/3 | 60.00% |
| -120 | 1.83 | 5/6 | 54.55% |
| -110 | 1.91 | 10/11 | 52.38% |
| EVEN (±100) | 2.00 | 1/1 | 50.00% |
| +120 | 2.20 | 6/5 | 45.45% |
| +150 | 2.50 | 3/2 | 40.00% |
| +200 | 3.00 | 2/1 | 33.33% |
| +300 | 4.00 | 3/1 | 25.00% |
Prediction-market prices map straight to probability: a $0.40 Yes contract is 40%, about +150 or 2.50 decimal before fees. See live probabilities on Linewire Markets, check a full market’s margin with the hold calculator, or price a multi-leg bet with the parlay calculator.
FAQ
How do you convert American odds to implied probability?
For negative odds: |odds| ÷ (|odds| + 100). For positive odds: 100 ÷ (odds + 100). Example: -150 is 60%, +150 is 40%, and -110 is 52.38%.
How do you convert American odds to decimal odds?
Positive odds: 1 + odds ÷ 100. Negative odds: 1 + 100 ÷ |odds|. Example: +200 is 3.00, -200 is 1.50, -110 is 1.91. Fractional odds are decimal minus 1, so 3.00 is 2/1. Both +100 and -100 are even money: 2.00 decimal, 1/1.
What is the vig and how do you remove it?
The vig (juice) is the bookmaker’s margin. In a two-way market the implied probabilities add up to more than 100%. Divide each side’s implied probability by the total to get the no-vig (fair) probability; -110/-110 becomes 50%/50%, or even money.