Convert Polymarket Prices to Betting Odds

Polymarket is the world's largest prediction market platform, allowing users to trade on the outcome of real-world events. Instead of traditional betting odds, Polymarket uses a share-based pricing system where each contract is priced between 1¢ and 99¢. This price directly represents the market's implied probability of the event occurring.

Enter a Polymarket contract price above to convert it to American, decimal, or fractional odds — or enter odds in any format to find the equivalent Polymarket price.

How Polymarket Pricing Works

On Polymarket, every event is structured as a binary outcome: Yes or No. Each side has a corresponding share price, and the two prices always add up to approximately $1.00 (100¢).

Here's how to read a Polymarket contract:

• A Yes share priced at 65¢ means the market believes there is a 65% chance the event will happen.
• If the event occurs, each Yes share pays out $1.00 — giving you a profit of 35¢ per share.
• If the event does not occur, the Yes share is worth $0.00 — you lose your 65¢ investment.

This is fundamentally the same as placing a bet at -186 American odds (or 1.54 decimal odds). You're risking $65 to win $35 in profit.

Polymarket Price to Odds Conversion Table

Why Compare Polymarket Odds to Sportsbook Odds?

Understanding the relationship between Polymarket prices and traditional betting odds is essential for finding value across platforms.

Polymarket Has Lower Fees Than Sportsbooks

Traditional sportsbooks like DraftKings, FanDuel, and BetMGM build a margin (called "vig" or "juice") into their odds, typically 4-10%. This means the implied probabilities of all outcomes add up to more than 100%, ensuring the book profits regardless of the result.

Polymarket operates differently. The platform charges minimal trading fees, and prices are set by the open market — not by a bookmaker. Because of this, Polymarket prices may track closer to estimated "true" probabilities than sportsbook odds, though no market is a guaranteed predictor of outcomes.

Finding Arbitrage Between Polymarket and Sportsbooks

If Polymarket prices an event at 65¢ (implying a 65% probability) but a sportsbook offers -150 American odds on the same outcome (implying only 60% probability with vig removed), the sportsbook is offering better value. Conversely, if the sportsbook's devigged probability is higher than the Polymarket price, the prediction market may be the better bet.

This cross-platform comparison is what the SmartStake Arbitrage Finder automates across 30+ sportsbooks in real time. Arbitrage betting is not risk free — odds can change between placements, and results are never guaranteed.

What Can You Bet on with Polymarket?

Polymarket covers a wide range of event categories beyond sports:

• Politics — Presidential elections, policy decisions, Supreme Court rulings
• Crypto & Finance — Bitcoin price targets, ETF approvals, interest rate decisions
• Culture & Entertainment — Award show winners, celebrity events, viral moments
• Science & Technology — AI milestones, space launches, FDA approvals
• Sports — Championship winners, MVP awards, draft picks

Because Polymarket operates on the Polygon blockchain, all trades are settled transparently and on-chain. There are no intermediaries — just supply and demand setting the price.

How to Use This Converter

1. Enter a Polymarket price (0-100) in the "Market Price" field. The converter instantly shows the equivalent American, decimal, and fractional odds.
2. Or enter traditional odds in any of the other fields to reverse-calculate the prediction market price.
3. Compare across platforms to find which one offers better value for the same event.

Example: Converting a Polymarket Election Contract

Suppose Polymarket has a contract for "Will Candidate X win the 2028 presidential election?" priced at 42¢.

Using the converter:

• Implied probability: 42%
• American odds: +138
• Decimal odds: 2.38
• Fractional odds: 29/21

If a sportsbook offers Candidate X at +150 American odds (implied 40% probability), the sportsbook is offering slightly better value. If the sportsbook offers +120 (implied 45.5%), Polymarket is the better deal.

Start Comparing Odds Across Platforms

Prediction markets like Polymarket provide a transparent, market-driven view of probability. By converting these prices to familiar odds formats, you can make informed decisions about where to place your bets.

Want to automate finding the best odds across all platforms? Try the SmartStake Arbitrage Finder to discover profitable opportunities in real-time.

Looking for more tools? Try our Prediction Market Converter tool, our Odds Converter for converting between all standard betting formats, or our Arbitrage Calculator to find arbitrage opportunities from odds discrepancies.