Kalshi vs sportsbooks: comparing the odds
Kalshi prices sports outcomes as contracts that pay $1. After its trading fee, a contract's price converts to ordinary odds, and on main markets it often pays slightly more than a -110 sportsbook line.
Converting a contract price to odds
A contract at 50¢ that pays $1 is decimal odds 2.00 (+100) before fees. Kalshi's published trading fee is about 0.07 × contracts × price × (1 − price), rounded up to the cent (Kalshi fee calculator).
100 contracts at 50¢ cost $50.00 plus a $1.75 fee. A win pays $100, so the effective decimal odds are 100 / 51.75 = 1.932, about -107, compared with -110 at a typical sportsbook.
Where it differs from a sportsbook
- Fees, not vig: the cost is a per-trade fee, largest at 50¢ and smaller near 0¢ or $1.
- Winners aren't limited the way they are at sportsbooks, since the exchange earns from fees.
- You can sell early at the current price, which works like a built-in hedge.
- Thinner markets on props and small games, so large stakes can move the price.
Using both
Converge reads Kalshi and Polymarket alongside sportsbooks and compares every price after fees, so a Kalshi contract and a FanDuel bet on the same game show on the same board. Fee schedules change; check Kalshi's current fees and whether it's available where you live.
Questions
Are Kalshi odds better than sportsbooks?
Often slightly better on main markets: a 50-cent contract after Kalshi's fee is about -107, compared with -110 at most books. On thin markets the spread between buy and sell prices can make it worse.
How do you convert Kalshi prices to odds?
Decimal odds = $1 / (contract price + fee per contract). A 50-cent contract with a 1.75-cent fee is 1 / 0.5175 = 1.932, about -107.
Does Kalshi limit winning bettors?
Exchanges earn from trading fees rather than from bettors losing, so they don't limit winners the way sportsbooks do. Market depth limits how much you can bet at a price.
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Updated 2026-10-26