Decimal, Fractional & American Odds Explained

Understanding Odds Formats

Odds tell you two things: the probability of an outcome and how much you will win. There are three main formats used worldwide.

Decimal Odds (Most Common in Africa)

Decimal odds show your total return per unit staked. Example: Odds of 2.50 mean a R100 bet returns R250 (R100 stake + R150 profit).

Formula: Payout = Stake × Odds

Fractional Odds (UK Style)

Shown as fractions like 3/1 (“three to one”). This means you win 3 units for every 1 unit staked. 3/1 in decimal = 4.00.

American Odds

Positive numbers (+200) show profit on a $100 bet. Negative numbers (-150) show how much you need to bet to win $100. Less common in Africa.

Converting Between Formats

• Fractional 3/1 = Decimal 4.00 = American +300
• Fractional 1/2 = Decimal 1.50 = American -200
• Fractional 6/4 = Decimal 2.50 = American +150

Implied Probability

Formula: Probability = 1 ÷ Decimal Odds × 100

Odds of 2.00 = 50% implied probability. Odds of 4.00 = 25%. The lower the odds, the more likely the bookmaker thinks it will happen.