How Betting Odds Work

Decimal odds: the format you'll see on SA betting sites

Decimal odds are the default across South African bookmakers. The number represents your total return per R1 staked, including your stake back.

• Odds of 2.50 → a R100 bet returns R250 (R150 profit + your R100 back).
• Odds of 1.50 → a R100 bet returns R150 (R50 profit).
• Odds of 4.00 → a R100 bet returns R400 (R300 profit).

The formula is simple:

Total return = stake × decimal odds Profit = stake × (decimal odds − 1)

Anything below 2.00 means the outcome is a favourite (you risk more than you win). Anything above 2.00 is an underdog (you win more than you risk). Odds of exactly 2.00 are an even-money bet.

You may still bump into fractional odds (5/2) on older horse racing displays, or American odds (+150 / −200) on US-facing content. But when you log into Betway, Sunbet or 10bet in South Africa, the coupon will be in decimals unless you change a display setting.

Odds as probability: what the number actually predicts

Every set of odds carries an implied probability — the chance the bookmaker is pricing into that outcome. Convert it like this:

Implied probability = 1 ÷ decimal odds

• Odds of 1.50 → 1 ÷ 1.50 = 0.667 = 66.7% chance implied.
• Odds of 2.00 → 1 ÷ 2.00 = 0.50 = 50%.
• Odds of 4.00 → 1 ÷ 4.00 = 0.25 = 25%.

Short odds mean the bookie thinks the outcome is likely; long odds mean unlikely. If you believe an outcome is more probable than the implied figure suggests, that's where you think you've found value. For example, if a Premiership (PSL) team is priced at 3.00 (33.3% implied) but you rate their true chance at 45%, the price is generous relative to your view.

This is the core skill behind betting: you're not just backing winners, you're comparing your own estimate against the price on offer.

The bookmaker margin (overround) — why odds never add up to 100%

Add up the implied probabilities of every outcome in a market and you'll get more than 100%. That extra slice is the bookmaker's margin, also called the overround or the vig. It's how the operator makes money regardless of the result.

Take a two-way market like a tennis match with no draw:

• Player A at 1.80 → 55.6% implied
• Player B at 2.00 → 50.0% implied
• Total = 105.6%

That 5.6% over 100% is the margin. The lower the margin, the more of your stake is returned as fair value over time.

BETAURO's odds sampling gives concrete figures for the operators we've priced. In our sampled markets, 10bet showed the lowest average margin at roughly 4.8%, Betway around 6.5%, and Sportingbet around 8.6%. Lower is better for the bettor — a 4.8% margin means the operator is skimming less off each market than an 8.6% one.

The practical takeaway: on the same match, a tighter-margin book will usually quote a slightly bigger price. Over hundreds of bets, that difference in odds quality compounds.

Best-price share: how often a book leads on odds

Margin tells you the average pricing. Best-price share tells you how often a bookmaker actually posts the top odds when compared against rivals on the same selection.

From BETAURO's sampled markets:

• Betway topped the best price on about 91% of sampled selections (238 markets sampled).
• 10bet led on about 85% (27 markets sampled).
• Sportingbet led on about 28% (39 markets sampled).

A high best-price share means that if you bet with that operator, you're frequently getting the strongest available number. Betway's odds rating of 7.9 and 10bet's 7.5 reflect this pricing strength in our scoring. Sportingbet scores 7.6 on odds overall despite a lower best-price share, because that metric is only part of the picture — market coverage, live pricing and depth also feed the rating.

Sample sizes differ (238 vs 27 vs 39), so treat the smaller samples as indicative rather than definitive. Always check the live price before you place, because odds move.

Worked example: a R200 PSL bet from odds to payout

Let's price a single Premiership match, home win at decimal odds of 2.40, with a R200 stake.

Step 1 — Total return: R200 × 2.40 = R480.

Step 2 — Profit: R480 − R200 = R280.

Step 3 — Implied probability of that price: 1 ÷ 2.40 = 0.4167 = 41.7%.

So the bookmaker rates the home win at about a 42% chance, and you'll clear R280 profit if it lands.

Now a multi (accumulator). You add two more legs at 1.50 and 1.80. Multiply all the odds together:

2.40 × 1.50 × 1.80 = 6.48

R200 × 6.48 = R1,296 total return, for R1,096 profit — but all three legs must win. The combined implied probability is 1 ÷ 6.48 = 15.4%, so a treble is far less likely to land than any single leg. That's the trade-off with accumulators: bigger returns, sharply lower probability, and the margin is applied to every leg.

Cash Out and live odds: prices that move

Odds aren't fixed. They drift and shorten as money comes in, injuries are confirmed, or the scoreline changes in-play. Live betting markets on Betway, Sportingbet, 10bet and others re-price continuously during a match.

Cash Out lets you settle a bet early at the current live value rather than waiting for the final result. Among the operators here, Betway, Sportingbet and 10bet list Cash Out as a feature. The amount offered is derived from live odds at that moment — so if your team goes 1-0 up, the cash-out figure rises; if they concede, it drops. Cash Out always carries a margin too, so you'll typically receive slightly less than the raw live-odds value.

Use Cash Out to lock in profit or cut a loss, but understand you're paying for that flexibility.

Comparing odds across bookmakers before you bet

The single most effective habit for a South African bettor is line shopping — checking the same selection across multiple licensed books and taking the best price.

Why it matters in rands: on a R200 bet, the difference between odds of 2.40 and 2.50 is R20 of profit on one wager. Repeat that across a season and it's meaningful money left on the table by not comparing.

All ten operators here are licensed by provincial authorities — Betway, Sportingbet, Sunbet, LulaBet and 10bet under the Western Cape GRB; Hollywoodbets under the KZN Gaming & Betting Board; Supabets, World Sports Betting and BetXchange under the Gauteng Gambling Board; Easybets under the Mpumalanga Economic Regulator. Betting must be 18+ in South Africa.

Having accounts at two or three books lets you take the strongest number on each selection. Betway's high best-price share makes it a solid default, while 10bet's low margin rewards higher-volume bettors.