Market Tool
Polymarket Price To Odds Converter
Turn a price in cents into implied probability, decimal odds and American odds — then put it side by side with a sportsbook line and see which one actually costs less.
Market price
Convert a prediction-market price
Enter what the outcome is trading at. The price in cents is already the market's implied probability — everything else is one division away.
Implied probability
62%
Decimal odds
1.61
American odds
-163
Fractional ≈
0.61 to 1
Same stake, both venues
Is the market or the book the better price?
Put in the best sportsbook price you can actually get on the same outcome — same match, same map, same settlement rules.
Profit at the market
+61.29
Profit at the book
+50.00
Book implied
66.7%
Spread check
What the round trip costs
Both outcomes of a binary market pay out $1 in total. Add the two asks: anything over 100¢ is what you are paying to be in the market at all.
Both asks total
102¢
2¢ of spread — that is the cost of a round trip, before fees.
Conversion notes
How do you convert a Polymarket price to decimal odds?
Divide 1 by the price in dollars. A 62¢ share is 1 ÷ 0.62 = 1.61 in decimal odds.
How do you convert a market price to American odds?
Above 50¢ the outcome is a favourite, so the line is negative: -(p ÷ (1 - p)) × 100. Below 50¢ it is positive: ((1 - p) ÷ p) × 100. At 62¢ that is -163.
Why do both sides add up to more than 100¢?
The difference is the spread. Both outcomes together pay exactly $1 at settlement, so anything above 100¢ is what it costs you to be in the market, the same role the vig plays at a sportsbook.
Does a cheaper price mean it is the better bet?
No. It tells you which venue costs less for the same outcome. You still need a reason to want that side, and a cheap price on a thin book can be expensive once slippage and fees are counted.
Price notice
Every number here is arithmetic on the prices you type, before fees, slippage and the size actually resting on the book. Compare the same match, the same map, and the same settlement rules, or the comparison means nothing.