Odds Converter

Convert between all major odds formats instantly. Enter a value in any format — Polymarket price, implied probability, decimal, American, fractional, Hong Kong, Malay, or Indonesian — and see the equivalent in every other format.

Input Format

Value

Polymarket Price

$0.65

Implied Probability

65.00%

Decimal Odds

1.5385

American Odds

-186

Fractional Odds

7/13

Hong Kong Odds

0.5385

Malay Odds

-1.8571

Indonesian Odds

-1.8571

Implied Probability

65.00%

0%50%100%

How to read each format

Polymarket PriceThe price of a share in USDC. A $0.65 share implies a 65% probability. If correct, you receive $1.00 per share.

Implied ProbabilityThe percentage chance the market assigns to an outcome. 65% means the market thinks there is a 65-in-100 chance.

Decimal OddsYour total return per $1 staked, including your stake. Decimal 1.54 means $1.54 total return on a $1 bet ($0.54 profit).

American OddsFavorites show how much you must risk to win $100 (e.g. -186). Underdogs show how much you win on a $100 stake (e.g. +154).

Fractional OddsProfit relative to stake as a fraction. 13/20 means $13 profit for every $20 staked. Common in UK betting.

Hong Kong OddsProfit per unit staked, like decimal odds minus 1. HK 0.54 means $0.54 profit on a $1 stake.

Malay OddsPositive (0 to 1) for underdogs showing profit per unit staked. Negative for favorites showing the stake needed to win 1 unit.

Indonesian OddsSimilar to American odds but based on 1 unit instead of 100. Negative for favorites (risk to win 1), positive for underdogs (win per 1 staked).

All conversions use implied probability as the canonical intermediate. Fractional odds are simplified using the greatest common divisor. American odds are rounded to the nearest integer.

Understanding Odds Formats

Different regions and platforms use different odds formats, but they all express the same thing: the implied probability of an outcome. Polymarket uses a simple dollar price between $0.01 and $0.99, where the price directly represents probability. A share priced at $0.65 means a 65% implied probability.

Why Convert Odds?

If you come from sports betting, you may think in American odds (-150, +200) or fractional odds (2/1, 4/5). If you trade on multiple prediction markets or exchanges, you may encounter decimal odds. Converting between formats helps you compare value across platforms and apply your existing intuition to Polymarket prices.

Frequently Asked Questions

How do Polymarket prices relate to probability?

A Polymarket share price directly represents the market’s implied probability. A share priced at $0.65 means the market assigns a 65% probability to that outcome. If the outcome occurs, the share pays out $1.00, yielding a profit of $0.35 per share. For more detail, see our guide on how prediction markets work.

What are the different odds formats?

There are 8 common odds formats used globally. Polymarket price and implied probability are the most intuitive. Decimal odds (popular in Europe and Australia) show the total return per dollar. American odds (used in the US) show how much you need to bet to win $100 (negative) or how much you win on a $100 bet (positive). Fractional odds (popular in the UK) show profit relative to stake. Hong Kong, Malay, and Indonesian odds are regional variants common in Asian markets.

How do I convert American odds to probability?

For negative American odds (favorites): probability = |odds| / (|odds| + 100). For example, -200 means 200/300 = 66.7%. For positive American odds (underdogs): probability = 100 / (odds + 100). For example, +150 means 100/250 = 40%. Use the converter above to check any value instantly.

For a deeper understanding of how to read and interpret Polymarket prices, see how prediction markets work. To understand how fees affect your trades, use our fee calculator. Ready to get started? Follow our signup guide.