Polymarket Odds Converter
How the conversions work
On a prediction market the share price is the implied probability: a contract that pays $1.00 if it resolves YES trades at its odds, so 63¢ means a 63% chance. From that single number every betting format follows.
Implied probability = price ÷ 100
Decimal = 1 ÷ probability
American (favorite) = −100 × p ÷ (1 − p)
American (underdog) = +100 × (1 − p) ÷ p
Fractional = (1 − p) : p
On a prediction market the share price is the implied probability — a 63¢ share means the market prices a 63% chance.
These are conversions. The live prices sit on Polymarket itself.
See live odds on PolymarketCommon conversions
Other calculators
Payout, fees, and ROI on any trade.
The exact taker fee by price, size, and category.
Daily, monthly, and yearly Holding Rewards (~3.25% APR).
What you get back as a maker — up to 25% of the taker fee.
Your tier and the 3–50% rebate on taker fees by 30-day volume.
Frequently asked
What does a Polymarket price mean in betting odds?
The price is the implied probability. A 63¢ share means the market prices a 63% chance — the same as −170 American, 1.59 decimal, or 37/63 fractional odds. Polymarket
Is the share price the same as implied probability?
Yes. A share that pays $1.00 if it resolves YES trades at its probability — 63¢ implies 63%. Small differences in practice come from the bid/ask spread.
How do you convert implied probability to American odds?
Favorites (probability above 50%): −(100 × p ÷ (1 − p)). Underdogs (below 50%): +(100 × (1 − p) ÷ p). So 63% → −170 and 40% → +150.
How do I convert decimal odds to probability?
Implied probability = 1 ÷ decimal odds. So 1.59 decimal → 63%, and 2.00 → 50%.
Disclaimer: Conversions are for informational purposes only and do not constitute financial advice. Prediction markets carry risk; do your own research before committing capital.