How to read prediction market odds
Prediction market odds look cryptic until you know the one conversion. After that, every price on the board tells you a story.
Cents are the implied probability
A YES share priced at 34¢ means the market implies a 34% chance of YES. A NO share on the same market would trade near 66¢ (34 + 66 = 100), the mirror image. To go from a price to a probability, you don't calculate anything — you just read the cents as a percent.
That's the entire trick. 7¢ is a 7% implied chance. 88¢ is an 88% implied chance. 50¢ is a genuine coin-flip in the market's eyes.
Price in cents = implied probability in percent. 34¢ ⇒ 34%.
Price and payout are two sides of the same coin
Because a winning share always pays $1, the price also tells you the payout. Buy YES at 34¢ and, if it resolves YES, you receive $1 — roughly a 2.9x return. Buy a near-certain outcome at 92¢ and you make about 1.09x if you're right.
This is why "cheap" and "likely" are opposites here. A low price means the market thinks the outcome is unlikely, which is exactly why the payout is large. Beginners often chase long shots for the payout without respecting the low probability attached to it.
Read the gap as a question
The real reason to read odds carefully is to compare them with a second opinion — your own research, or an AI estimate. When the two differ, the difference is a question, not an answer: what does the market know that the research missed, or the other way round? A market at 34¢ where careful research points to 41% is a 7-point gap that deserves a look at the sources.
Prices are hard to beat, and a gap is no guarantee. How often prices in each range have actually come true is public in our accuracy study — that record is the base rate any gap has to beat.
Volume and liquidity change the meaning
A price on a thin, low-volume market is a weaker signal than the same price on a deep, heavily traded one. With little money behind it, a single trade can swing the odds, so treat quiet markets' prices as rough drafts rather than firm consensus.
Always glance at volume and the orderbook before you trust a number. A 60% implied chance backed by millions in volume is a very different statement than 60% on a market nobody is trading.
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How this was researched
Guides are written against primary sources and checked against the market data we collect ourselves.
See how often prices came true
Our study compares Polymarket prices a week before resolution with what happened, by price range and topic, with the data to download.
Read the accuracy studyFrequently asked questions
- Why don't YES and NO always add up to exactly 100¢?
- In an idealized market they do. In practice, spreads, fees and thin liquidity can make the two sides sum to slightly more or less than 100¢ at any instant. The gap is usually small on liquid markets.
- Does a higher price mean a better bet?
- No. Price reflects probability, not value. A 92¢ share is more likely to win but pays little; a 12¢ share pays a lot but rarely wins. Value comes from the gap between the price and the true probability, not from the price itself.
- How do I turn odds into a percentage quickly?
- Read the cents as the percent — 34¢ is a 34% implied chance. No math required. Market Guy also shows the implied probability directly on every market.
Keep learning
Prediction markets carry real risk of loss. Nothing on Market Guy is financial advice — it is research tooling to help you think, not a signal to trade.