Free betting tools
Odds Converter & Implied Probability
Convert between American, decimal and fractional odds and see implied probability.
Odds format
Enter valid odds and values to see the result.
Frequently asked questions
How do I convert American odds to decimal?
For positive American odds, divide by 100 and add 1 (+150 = 2.50). For negative odds, divide 100 by the number and add 1 (−200 = 1.50).
What is implied probability?
Implied probability is the chance of an outcome suggested by the odds. For decimal odds it is 1 ÷ odds — for example, 2.00 implies 50%.
What is the vig or bookmaker margin?
The margin is how much the implied probabilities of all outcomes add up to above 100%. Removing it gives no-vig fair probabilities.
More free betting tools
For information only. These calculators do not guarantee profit. 18+. Bet responsibly.