Decimal odds
Decimal odds are the default format on all major South African bookmakers. The number represents your total return for every R1 staked, including the return of your original stake.
| Odds | R100 stake returns | Profit | What it means |
|---|---|---|---|
| 1.20 | R120 | R20 | Heavy favourite |
| 1.80 | R180 | R80 | Moderate favourite |
| 2.00 | R200 | R100 | Evens (50/50) |
| 3.50 | R350 | R250 | Underdog |
| 10.00 | R1,000 | R900 | Long shot |
The formula for profit from decimal odds is: profit = (odds − 1) × stake. So odds of 3.50 on a R200 bet: (3.50 − 1) × R200 = R500 profit, total return R700.
Fractional odds
Fractional odds are common in UK horse racing and some international sportsbooks. They show profit relative to stake, not total return. The number on the left is profit; the number on the right is the stake required to earn that profit.
| Fractional | Decimal equivalent | R100 profit |
|---|---|---|
| 1/5 | 1.20 | R20 |
| 4/5 | 1.80 | R80 |
| Evens (1/1) | 2.00 | R100 |
| 5/2 | 3.50 | R250 |
| 9/1 | 10.00 | R900 |
To convert fractional to decimal: divide the numerator by the denominator, then add 1. So 5/2 = (5 ÷ 2) + 1 = 3.50. Use the Bonus Browser Betting Calculators Betting Guides
Odds Converter to do this instantly.American odds
American odds (also called moneyline odds) use a +/- system based on a R100 unit. They're rarely used on SA platforms but appear on US-focused content and some international odds comparison sites.
- Negative number shows how much you must stake to win R100 profit. -150 means stake R150 to profit R100.
- Positive number shows how much profit a R100 stake returns. +250 means a R100 stake profits R250.
The crossover point is +100 and -100, which both equal decimal odds of 2.00 (evens).
Implied probability
Implied probability is the probability of an outcome winning as implied by the odds before bookmaker margin is removed. It's the most useful number for comparing whether a price represents value.
Odds 2.50 = 1 ÷ 2.50 = 0.40 = 40%
Odds 1.60 = 1 ÷ 1.60 = 0.625 = 62.5%
Odds 4.00 = 1 ÷ 4.00 = 0.25 = 25%
When you add the implied probabilities of all outcomes in a market (for example, home win + draw + away win in football), the total will exceed 100%. That excess is the bookmaker's margin. If the total is 106%, the margin is 6%.
Finding value
Value betting means placing bets where you believe the true probability of an outcome is higher than the bookmaker's implied probability. If you think a team has a 50% chance of winning but the bookmaker prices them at 2.20 (implying 45.5%), there's a theoretical edge.
This is harder than it sounds. Bookmakers employ professional odds compilers and have extensive data. But on less-watched markets, local knowledge can help. SA bettors who follow Currie Cup or Diski Challenge closely may spot mispriced lines before the market adjusts.
The key habit is converting odds to implied probability and asking: "Do I genuinely believe this outcome is more likely than the bookmaker does?" If you can't honestly answer yes, the price isn't value.
SA sports examples
Here are three examples using South African sports to practise reading odds.
Springboks 2.10 / Draw 18.00 / All Blacks 1.75
All Blacks are the favourite at 1.75 (implied 57.1%). Springboks at 2.10 imply 47.6%. Combined with draw: 47.6 + 5.6 + 57.1 = 110.3% total, meaning the market carries a 10.3% margin. This is higher than typical for a major Test and worth shopping around.
Chiefs 2.40 / Draw 3.10 / Pirates 2.80
Implied probabilities: 41.7% + 32.3% + 35.7% = 109.7%. The draw at 3.10 implies a 32.3% chance. PSL derbies draw roughly 28-30% of the time historically, so the 3.10 is at or below fair value.
Proteas 1.65 / Draw/No result 4.50 / Opposition 2.90
Proteas at 1.65 imply a 60.6% win probability. A R100 bet returns R165. If you think Proteas win 70%+ of such series at home, this price has positive expected value.