How to Read Betting Odds in South Africa
South African sportsbooks display odds in decimal format. Once you understand the basics, reading odds becomes intuitive. This guide explains what odds mean, how to calculate potential returns, and what implied probability tells you.
Decimal Odds: The Basics
Decimal odds represent the total return per rand staked, including your stake. An odd of 2.00 means you get R2 back for every R1 you stake. An odd of 3.00 means R3 back per R1 staked.
To calculate your total return: multiply your stake by the decimal odds. To calculate your profit: total return minus your stake.
Examples
| Stake | Odds | Total Return | Profit |
|---|---|---|---|
| R100 | 1.50 | R150 | R50 |
| R100 | 2.00 | R200 | R100 |
| R100 | 3.00 | R300 | R200 |
| R100 | 5.00 | R500 | R400 |
| R100 | 10.00 | R1,000 | R900 |
Implied Probability
Odds also tell you what probability the bookmaker assigns to that outcome. To calculate implied probability: divide 1 by the decimal odds and multiply by 100.
Odds of 2.00 imply a 50% probability (1 ÷ 2.00 = 0.50, or 50%). Odds of 4.00 imply a 25% probability (1 ÷ 4.00 = 0.25, or 25%).
If you believe the true probability of an outcome is higher than what the odds imply, you have found what's called value. Value betting is the approach professional bettors use to find an edge over the bookmaker's pricing.
The Bookmaker's Margin
Bookmakers build a profit margin into their odds. If you add up the implied probabilities of all outcomes in a market, they total more than 100%. The excess — typically 4 to 8% on major markets — is the bookmaker's margin. This is how sportsbooks make money over the long term.
Betway operates at around 5 to 6% on Premier League football. Sportingbet's MultiBoost and Betway's ACCA Boost partially offset this margin for accumulator bettors by adding to returns on multi-leg bets.
Accumulators and Odds Multiplication
When you build an accumulator, the odds of each leg are multiplied together. Three selections at 2.00 each produce combined odds of 8.00 (2.00 × 2.00 × 2.00). Bet R100 and win: R800 return, R700 profit. The multiplication also means one wrong leg eliminates all winnings — the risk that comes with accumulator betting.