These calculators make the arithmetic visible. They do not predict results, identify value automatically or make a wager safer.
Odds, implied probability and return
Enter decimal odds and an optional stake to see the simple implied probability, possible total return and possible profit. The result does not adjust for the bookmaker margin or prove that the price is fair.
Formula: implied probability = 1 ÷ decimal odds; total return = stake × decimal odds.
Market margin
Enter all decimal prices for mutually exclusive outcomes in the same market. The calculator adds their implied probabilities. The amount above 100% is a simple overround indicator, not a complete measure of every cost or rule difference.
Formula: add (1 ÷ price) for every mutually exclusive outcome. The amount above 100% is the simple overround.
Privacy: These calculations run in your browser. Values entered into the tools are not submitted to the Imali Games server by the core calculator feature.