How does a prediction market price convert to betting odds?

A contract that pays $1 if it resolves "yes" trades at its implied probability, so a 62¢ price means a 62% chance. Convert that probability to odds the usual way: decimal = 1 ÷ 0.62 = 1.61, which is about -163 in American odds. This tool does every format at once.

What do cents mean on Kalshi or Polymarket?

Prediction markets quote contracts that settle at $1 (100¢). The current price in cents equals the market’s implied probability as a percentage: a 35¢ contract implies a 35% chance, the same as +186 American odds. Buy at 35¢ and you risk 35¢ to win 65¢.

Can I convert American odds back into a contract price?

Yes. Type any American, decimal, or fractional price and the converter shows the equivalent prediction-market price in cents and as a 0–1.00 probability. That lets you compare a sportsbook line directly against a Kalshi or Polymarket contract.

Why is the contract price the same number as implied probability?

Because the contract pays exactly $1 on resolution, its fair price is just the probability of that outcome expressed in dollars. 0.62 probability and a 62¢ price are the same figure on two scales — which is why prediction-market pricing is often easier to read than American odds.

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Prediction market odds converter

Type a Kalshi or Polymarket price and the betting odds update live — or go the other way and turn any sportsbook line into a contract price. Every format stays in sync.

Prediction market price

Price scale

American odds

Decimal odds

Fractional odds

Implied probability (%)

How prediction-market cents map to betting odds

A prediction-market contract is a simple bet: it pays $1 (100¢) if the event happens and $0 if it does not. Because the payout is fixed at a dollar, the price you pay is the market’s implied probability. A contract trading at 62¢ means the market thinks the outcome is 62% likely — the exact same information as a 1.61 decimal price or roughly -163 in American odds.

That one-to-one mapping makes prediction-market pricing unusually easy to read: the cost in cents is the break-even win rate. Sportsbook odds bury the same number inside a format, plus the book’s margin (the vig). To strip that margin out and compare a true price across venues, run the line through our vig & hold calculator. For the wider picture, the guide on how prediction markets work walks through pricing, resolution, and fees.

Frequently asked questions

How does a prediction market price convert to betting odds?: A contract that pays $1 if it resolves "yes" trades at its implied probability, so a 62¢ price means a 62% chance. Convert that probability to odds the usual way: decimal = 1 ÷ 0.62 = 1.61, which is about -163 in American odds. This tool does every format at once.
What do cents mean on Kalshi or Polymarket?: Prediction markets quote contracts that settle at $1 (100¢). The current price in cents equals the market’s implied probability as a percentage: a 35¢ contract implies a 35% chance, the same as +186 American odds. Buy at 35¢ and you risk 35¢ to win 65¢.
Can I convert American odds back into a contract price?: Yes. Type any American, decimal, or fractional price and the converter shows the equivalent prediction-market price in cents and as a 0–1.00 probability. That lets you compare a sportsbook line directly against a Kalshi or Polymarket contract.
Why is the contract price the same number as implied probability?: Because the contract pays exactly $1 on resolution, its fair price is just the probability of that outcome expressed in dollars. 0.62 probability and a 62¢ price are the same figure on two scales — which is why prediction-market pricing is often easier to read than American odds.

For informational purposes only. Not betting or financial advice. Please gamble responsibly. 21+ where applicable.