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.
Common conversions
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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 earn back as a maker — 20–25% 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.