Prediction Market to Betting Odds Converter

Enter any value to convert between formats
Enter a value between 0 and 100
Negative for favorites, positive for underdogs
Total return per $1 staked (e.g., 2.50 means $1 → $2.50 total).
Enter a value between 0 and 100

What does this calculator do?

Above, you’ll find the most intuitive prediction market odds converter available. Ever look at an 64¢ contract and wonder what that translates to in traditional sportsbook terms? This tool does the math instantly. Just enter a contract price to get the equivalent American odds and implied probability — or plug in American odds to see the corresponding prediction market odds.

If you come from the sports-betting world, prediction-market pricing can feel unfamiliar. For example, what does it really mean to buy a “No” share on the Los Angeles Lakers at 32¢? Instead of crunching numbers in your head, our prediction market odds converter handles the conversion for you and shows you the sportsbook-style odds for any contract. That way, you can compare prediction market odds to sports book odds instantly.

And if you’re exploring more tools, we’ve got you covered. Our market fees calculator shows you how fees vary across prediction markets and our sportsbook vig calculator shows the juice that sports books are taking from your bets. Across the board, these tools are designed to help you bet smarter and make informed decisions backed by clear, transparent math.

Frequently Asked Questions

The Prediction market odds converter performs exact, fee‑free conversions between formats: price ↔ probability ↔ American odds. It assumes a $1 payoff for prediction‑market prices, which is the standard convention (e.g., a price of 0.62 represents a 62% belief).

For positive odds +o, implied probability is 100/(o+100). For negative odds −o, implied probability is o/(o+100), where o is the absolute value. We then express that probability as a percent and also as a prediction‑market price on a $1 contract.

At exactly 50%, books commonly display +100 rather than −100. The converter follows this convention so even‑money situations are easy to read.