How to read Polymarket & Kalshi odds

This is the one idea that unlocks everything: on Polymarket and Kalshi, the price of a share in cents equals the market's implied probability. A contract trading at 65¢ means the market gives that outcome roughly a 65% chance. At 8¢ it's a long shot (8%); at 92¢ it's a heavy favourite (92%). Each winning share settles at $1 (100¢), so the price you pay is literally 'how many cents on the dollar' the market thinks the outcome is worth right now.

Every market has two sides — Yes and No — and their prices are two views of the same probability. If Yes trades at 65¢, then No trades at about 35¢ (they add up to roughly 100¢). Buying No at 35¢ is the same as saying 'I think there's a 65% chance this doesn't happen.' So you never need to 'bet against' anything awkwardly: if you're bearish on an outcome, you just buy the No share. Whichever side settles true pays $1 per share; the other pays $0.

If you're used to sportsbook odds, convert the cent price like this: Decimal odds = 100 ÷ price in cents • 65¢ → 100 ÷ 65 = 1.54 • 25¢ → 100 ÷ 25 = 4.00 Implied probability = the cent price itself (65¢ = 65%). American odds: for a favourite (≥50¢) it's negative, for an underdog (<50¢) positive — e.g. 65¢ ≈ -186, 25¢ ≈ +300. You don't have to do this by hand — our odds converter has a dedicated 'cents (Kalshi/Polymarket)' input that does all four formats at once.

You'll usually see two prices: the bid (what buyers will pay) and the ask (what sellers want). The gap between them is the spread. • The midpoint of bid and ask is the best single estimate of the true probability. • A tight spread (e.g. 64¢ / 66¢) means a liquid, actively-traded market — cheap to enter and exit. • A wide spread (e.g. 55¢ / 75¢) signals thin liquidity — you pay a premium to trade, and the 'price' is less reliable. Always check the spread and the market's volume before trusting the headline number.

Prediction-market prices update in real time as money flows in, so a moving price is the probability changing as new information arrives. If a contract jumps from 40¢ to 70¢, the market just repriced that outcome from a 40% to a 70% chance — often because of news. This is why traders watch prediction markets as fast, crowd-sourced probability estimates. It also means you can trade the move: buy at 40¢, sell at 70¢, and take the 30¢ profit without ever waiting for the event to resolve.

• Cents = probability. 65¢ = 65%. • Decimal = 100 ÷ cents. 65¢ = 1.54. • Yes + No ≈ 100¢. Bearish? Buy the No share. • Midpoint of bid/ask ≈ true probability; spread = liquidity cost. • Wide spread or low volume → treat the price with caution. • A moving price = the market's probability updating live. Once you read prices as probabilities, prediction-market odds are actually clearer than fractional or American sportsbook odds — the number tells you exactly what the market thinks. Remember it's educational information, not financial advice, and only trade what you can afford to lose.