Convert odds for and against into a probability of winning and losing, and decimal odds. Enter your values; the result updates as you type, with the method shown below.
Formula
P = for / (for + against)
Worked example
Odds of 1 to 4: 20% chance of winning, decimal odds 5.
Frequently asked questions
What does 1 to 4 mean?
One way to win for four ways to lose.
What are decimal odds?
The total return per unit staked: 1 / probability.
Do bookmaker odds equal probabilities?
No, they include a margin.
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Results are estimates for information only. Check important figures with a professional.