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ChessBetting calculators
Free odds tools: convert odds between formats, find the stakes of a sure bet, and see the bookmaker margin hidden in a price.
Odds converter
Type a price in any format — decimal, fractional, American, Hong Kong, Indonesian, Malay or implied probability — and the rest update at once.
Sure bet calculator
Enter the best price for every outcome and the total you want to stake: the calculator splits it so that every result returns the same amount, and shows the profit if the prices form an arbitrage.
Margin calculator
Enter the prices of every outcome of one market: the calculator shows the bookmaker margin built into them, the fair price and the true probability of each outcome.