Convert between American, decimal, fractional odds and implied probability. Type into any field — all the others update instantly.
Enter both sides of a two-way sportsbook market to get the no-vig fair probability and the bookmaker's margin.
| American | Decimal | Fractional | Implied % |
|---|---|---|---|
Tap any row to load those odds into the converter above.
On Polymarket the price is the probability. If a contract trades at 60¢ the market is saying the probability is 60% — no vig, no format conversion. Buy at 60¢, contract pays $1 if it resolves YES.
ZenHodl runs calibrated win-probability models on 11 sports and publishes the live edges. See our fair-value calculator or read the full odds formats explainer.
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Trade these markets with calibrated probabilities, not guesswork.