Polymarket odds converter
Convert between Polymarket share prices, probability, decimal odds, and American odds. Pick the format you have, see the rest live.
Enter cents (1–99) or dollars (0.01–0.99)
How prediction-market odds work
On Polymarket, shares trade between $0.01 and $0.99, and the share price is the implied probability. A share priced at $0.65 means the market believes there's a 65% chance of that outcome. When the market resolves, winning shares pay $1.00 and losing shares pay $0.00.
Sports books and other betting markets quote the same probability in different formats - decimal odds and American odds. Once you know the probability, you can convert between any of them.
What are decimal odds?
Decimal odds represent the total payout per $1 wagered. The formula is 1 / probability. A $0.40 share has decimal odds of 2.50 - meaning you get $2.50 back for every $1 risked, including your stake. Decimal odds are common in Europe and Australia.
What are American odds?
American odds work in two directions, depending on whether the outcome is favored or not.
- Negative numbers (e.g.
-186) show how much you have to bet to win$100.-186means risk $186 to win $100. Used for favorites with probability above 50%. - Positive numbers (e.g.
+400) show how much you win from a $100 bet.+400means win $400 on a $100 bet - implies a 20% probability. Used for underdogs.
American odds are common in U.S. sports betting.
Quick reference
| Share price | Probability | Decimal | American |
|---|---|---|---|
| $0.20 | 20.0% | 5.00 | +400 |
| $0.35 | 35.0% | 2.86 | +186 |
| $0.50 | 50.0% | 2.00 | +100 |
| $0.65 | 65.0% | 1.54 | -186 |
| $0.80 | 80.0% | 1.25 | -400 |
| $0.95 | 95.0% | 1.05 | -1900 |