Convert between prediction market prices, implied probability, American odds, and decimal odds. Enter any value and see all formats instantly.
How Prediction Market Odds Work
On Kalshi and Polymarket, contract prices range from $0.01 to $0.99. The price equals the implied probability — a $0.65 contract means the market thinks there's a 65% chance the event happens.
Converting to Traditional Odds
A $0.65 contract (65% probability) equals -186 in American odds or 1.54 in decimal odds. Use the calculator above to convert any format.
Why Traders Convert Prices
Prediction markets quote contracts as prices, while many sports and finance traders think in probabilities, American odds, or payout multiples. Converting the same market into each format makes it easier to compare a Kalshi event contract with a sportsbook line, a Polymarket price, or your own probability estimate.
If your model says an event should be 58% likely and the market price implies 49%, the gap is the edge you are evaluating. The calculator does not tell you whether the thesis is correct, but it keeps the math explicit before you size a position.
How the prediction market odds calculator fits into prediction market research
A prediction market tool is useful when it makes the trade decision more explicit. Calculators, trackers, and AI research pages should not replace the core market checks: current price, implied probability, settlement language, liquidity, spread, related contracts, and the news catalyst behind the move. The tool should make those checks faster and harder to skip.
Use the prediction market odds calculator before you place risk, not after the trade is already emotional. Convert the price into probability, compare the possible payout with the maximum loss, and decide whether the expected edge is still meaningful after fees and slippage. If the market is thin, reduce confidence in the displayed price until you know your entry can fill.
Connecting tools with live odds
The most common mistake is using a tool in isolation. A profitable looking payout may still be a bad trade if the probability is too low. A high probability may still be unattractive if the return is small or the market is hard to resolve. After using the tool, open the live odds board and compare the market with related contracts on Polymarket and Kalshi.
Alphascope connects tools with market pages so the math leads back to real contracts. The odds board shows current prices, AI predictions add forecast context, and news impact analysis helps explain why a price may have moved. That full workflow is stronger than any single calculator output.
Questions to answer after using the tool
After using the prediction market odds calculator, write down the market price, the implied probability, the maximum loss, the expected payout, and the evidence that would make the trade wrong. If those answers are not clear, the tool has surfaced a research gap rather than a trade. Open the market page, read the settlement rule, and compare nearby contracts before deciding whether the math still supports the idea.
This process is especially important for fast moving markets. A price that looked attractive before a headline may become unattractive after the book reprices. Re-run the calculation after major news, after a large order fills, or before increasing size. Prediction market tools are most useful when they stay connected to the live price.
