Fractional Odds

Fractional Odds

Basic Betting

Definition

Odds format (traditional in UK/Ireland) expressed as a fraction (profit/stake). The fraction shows profit relative to stake.

Formula

If odds = A/B, Profit = (A/B) × Stake. Implied Probability = B/(A+B) × 100%.

Example

Odds of **3/1** (“three-to-one”) mean you win \$3 profit for every \$1 staked (so a \$100 bet yields \$300 profit). A favorite might be **1/3**, meaning \$1 profit on \$3 bet (implied 75% chance).