Odds Converter

Understanding Odds Formats

Decimal Odds

Decimal odds (also called European odds) represent the total return per unit staked, including your original stake. Odds of 2.50 on a 10 stake return 25 (profit of 15). This is the most common format in the UK and Europe and the easiest for accumulator calculations because you simply multiply the odds together.

Fractional Odds

Fractional odds are the traditional UK format, expressed as a ratio like 6/4 or 5/2. The first number is your profit for every unit of the second number staked. So 6/4 means a 4 stake returns 6 profit plus your 4 stake back = 10 total. To convert to decimal: divide the top by the bottom and add 1. So 6/4 = 6/4 + 1 = 2.50.

American Odds

American odds (moneyline) are expressed as positive or negative numbers. Positive odds (+150) show how much profit a 100 stake returns. Negative odds (-150) show how much you need to stake to profit 100. To convert +150 to decimal: 150/100 + 1 = 2.50. To convert -150 to decimal: 100/150 + 1 = 1.67.

Implied Probability

Implied probability is how likely the bookmaker's odds imply an outcome to be. It is calculated as 1 divided by the decimal odds, expressed as a percentage. Odds of 2.50 = 1/2.50 = 40% implied probability. If your own assessment puts the probability higher than 40%, the bet has positive expected value. Read our value betting guide for more on this concept.