Basics · 5 min read

    Reading probability prices: a 5-minute primer

    By Catie Di StefanoPublished January 5, 2026Updated August 5, 2026

    Why a price in cents is already a probability — and why you'll never want to convert odds again.

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    Independent educational guide. Not affiliated with, endorsed by, or connected to FIFA or any official World Cup body.

    Reading probability prices: a 5-minute primer

    Sources

    Every figure on this page is checked against primary sources — regulator filings, exchange documentation and official results. Prices and rules change; verify with the operator before trading.

    1. 1.Kalshi Help Center — fees, funding and account rulesKalshi
    2. 2.Kalshi market listings and contract rulebooksKalshi
    3. 3.Polymarket documentation — markets, fees and resolutionPolymarket
    4. 4.Polymarket Learn — how the exchange worksPolymarket
    5. 5.Customer advisories and investor protection noticesU.S. Commodity Futures Trading Commission
    6. 6.Designated Contract Markets (DCMs)U.S. Commodity Futures Trading Commission

    Frequently asked questions

    What does a 62¢ contract mean?

    It means the market thinks there's a 62% probability the event happens. If you buy and the event occurs, you collect $1. If not, you lose your 62¢.

    Do I need to convert odds to use a prediction market?

    No. A contract price in cents is already the implied probability in percent, so there is no conversion step at all. A contract at 62¢ means a 62% chance.

    Why are probability prices clearer than payout-style odds?

    Probability prices show the market's exact view with no hidden margin. YES and NO add up to exactly 100¢ on a federally-regulated event-contract platform. Payout-style formats bake in a margin that obscures the true probability.

    Do YES and NO always add to 100¢?

    Yes, by construction. If YES is 62¢, NO is 38¢. The platform charges a small disclosed fee per fill instead of hiding it inside the price.

    What is the bid-ask spread on prediction markets?

    The difference between the highest buy order and lowest sell order. Deep markets like Super Bowl winner often run a 1¢ spread; thin or far-future markets can run 5–10¢ wide.

    Can I sell my position before the event resolves?

    Yes. Anytime liquidity exists, you can sell back into the order book and lock in gains or cut losses — something traditional sportsbooks rarely allow cleanly.

    Next steps

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    Certain limitations apply. The offer is available to new users only, subject to the terms and conditions at kalshi.com/tc/500. 18+ only. Restrictions and eligibility requirements apply. Event contract trading involves significant risk and is not appropriate for everyone. Please carefully consider if it is appropriate for you in light of your personal financial circumstances. Kalshi products are not available in all jurisdictions. See kalshi.com/regulatory for more information.