Best-odds books for Kiwi punters — at a glance
Odds quality is the single biggest factor in long-term results, so it carries the most weight in our 25-point review process. These three books consistently priced rugby, NRL and football markets tighter than the field when we tested them. See the full ranked list on our best sports betting sites pillar. 18+, T&Cs apply, minimum-odds and rollover conditions vary.
| # | Bookmaker | Why for odds | Rating | |
|---|---|---|---|---|
| 1 |  22bet | Sharpest prices & lowest margins on rugby/NRL head-to-heads | 4.6 ★★★★★ | Visit |
| 2 |  Rabona | Competitive lines plus live streaming to price in-play value | 4.4 ★★★★☆ | Visit |
| 3 |  Casinia | Solid pricing across mainstream markets with NZD auto-switch | 4.4 ★★★★☆ | Visit |
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How decimal odds work
New Zealand bookmakers quote in decimal odds — the same format used across Australia and most of Europe. It is the simplest system to understand because a single number does all the work: the decimal figure shows your total return per NZ$1 staked, including your stake back.
So odds of 2.50 mean that for every NZ$1 you stake, you get NZ$2.50 back if the bet wins. Odds of 1.50 return NZ$1.50 per dollar; odds of 5.00 return NZ$5.00 per dollar. The higher the number, the less likely the bookmaker thinks the outcome is — and the bigger your payout if it lands.
An important reference point is even money, which in decimal odds is 2.00. At 2.00 you double your money: a NZ$10 winning bet returns NZ$20. Anything below 2.00 is odds-on (a short-priced favourite that returns less than double); anything above 2.00 pays more than your stake in profit.
Calculating your returns
The maths could not be simpler. To find your total return, multiply your stake by the decimal odds:
To find your profit, subtract your stake from the total return.
- A NZ$10 bet at odds of 2.50 returns NZ$25 (10 × 2.50) — a NZ$15 profit plus your NZ$10 stake.
- A NZ$20 bet at odds of 3.00 returns NZ$60 (20 × 3.00) — a NZ$40 profit.
- A NZ$50 bet at odds of 1.80 returns NZ$90 (50 × 1.80) — a NZ$40 profit.
For a multi (accumulator), multiply the odds of each leg together, then multiply by your stake. A three-leg multi at 1.50, 2.00 and 1.80 has combined odds of 5.40 (1.50 × 2.00 × 1.80), so a NZ$10 stake returns NZ$54 if all three legs win. This compounding is why multis pay so much more than singles — and why they are so much harder to land.
Implied probability
Every set of odds carries an implied probability — the chance of the outcome that the bookmaker has priced in. Converting odds to a percentage is the key skill for judging whether a bet is worth taking. The formula is:
- Odds of 2.00 imply a 50% chance (1 ÷ 2.00 = 0.50).
- Odds of 4.00 imply a 25% chance.
- Odds of 1.50 imply a 66.7% chance.
- Odds of 1.25 imply an 80% chance — a heavy favourite.
Why does this matter? Because if you believe an outcome is more likely than the odds imply, you have found a potential value bet. If the All Blacks are priced at 1.50 (implying 66.7%) but you rate their real chance closer to 75%, the bookmaker is offering you a better price than the true probability — over many such bets, that edge is where profit comes from.
Converting odds formats
Decimal is the NZ default, but you will occasionally see other formats, especially on international sites or in overseas coverage. Here is how they relate:
- Fractional (UK): 5/2 means you win NZ$5 profit for every NZ$2 staked. To convert to decimal, divide the first number by the second and add 1 — 5/2 becomes 3.50. Even money (1/1) is 2.00 in decimal.
- American (US moneyline): a positive figure like +150 means a NZ$100 stake wins NZ$150 profit (decimal 2.50); a negative figure like -110 means you must stake NZ$110 to win NZ$100 (decimal 1.91).
Most offshore books that accept New Zealand punters let you switch the display in your account settings, but you will almost always start on decimal. There is no need to memorise conversions — just remember that decimal odds already include your stake, whereas fractional and American figures show profit only.
Value, overround and the margin
A bookmaker is a business, so the odds are never a perfectly fair reflection of probability — they are shaded in the book's favour. That built-in profit is called the overround (also known as the margin, vig or juice).
To see it, add up the implied probabilities of every outcome in a market. In a fair, margin-free market the total would be exactly 100%. But a real book prices a two-way market so the total comes to something like 105% — that extra 5% is the overround, the edge the bookmaker keeps whichever way the result goes.
Value is simply a price where the odds are longer than the true probability warrants. You cannot control the result of a match, but you can control whether you consistently take value prices — and the lower the margin you bet into, the more of your edge you keep. For more on turning this into a system, see our betting strategies guide.
Odds comparison and why line shopping matters
Because every book sets its own margin, the same market is priced differently across sites. Taking the best available price — known as line shopping — is the single most reliable way for a recreational punter to improve returns without predicting anything more accurately.
Imagine backing the All Blacks at 1.90 at one book when another offers 2.00. On a NZ$100 bet that is the difference between a NZ$90 and a NZ$100 profit — a 10% improvement for zero extra risk, on one bet. Repeat that discipline across a season and the compounding effect is significant. This is why serious punters hold accounts at several books and always check two or three prices before staking.
Our full best sports betting sites list ranks each book partly on how competitive its decimal odds are. If you are still learning the language of betting, our betting glossary defines every term, and you can read how we score odds and margins on our How We Rate page. You can also meet the Kiwi team behind these tests on our authors page.
Play it safe
You must be 18 or over to bet in New Zealand. Understanding odds does not guarantee a profit — betting should be entertainment, not a way to make money. Set a deposit limit before you play, never chase losses, and take breaks. If gambling stops being fun, free confidential help is available 24/7 from the Gambling Helpline NZ on 0800 654 655, the Problem Gambling Foundation (0800 664 262) and Safer Gambling Aotearoa. Read our full responsible gambling guide.
Frequently asked questions
How do decimal odds work in New Zealand?
Decimal odds are the NZ standard. They show your total return per NZ$1 staked, including your stake back. Odds of 2.50 mean a NZ$10 bet returns NZ$25 — a NZ$15 profit plus your NZ$10 stake. Multiply your stake by the odds to find any return.
How do I calculate my winnings from decimal odds?
Multiply your stake by the decimal odds for your total return, then subtract the stake for the profit. A NZ$20 bet at 3.00 returns NZ$60 (20 × 3.00), a NZ$40 profit plus your NZ$20 stake. The formula is stake × odds = total return.
What is implied probability in betting?
It is the chance an outcome has according to the odds. Divide 1 by the decimal odds: 2.00 implies 50%, 4.00 implies 25%. If you rate an outcome more likely than the implied probability, you may have found a value bet.
What is the overround or margin?
It is the bookmaker's built-in profit. Add the implied probabilities of every outcome: a fair market totals 100%, but a book prices it above 100% — the excess is the overround. A tighter market, closer to 100%, is better value for punters.
Why should I compare odds across betting sites?
The same market is priced differently at different books. Taking the best price (line shopping) is the simplest way to add value with no extra risk. Over a season those edges compound. In our testing, 22bet most often had the sharpest rugby and NRL prices.
Are odds shown as decimals or fractions in NZ?
Decimal is the NZ standard, matching Australia and most of Europe. Fractional odds (5/2) are a UK convention and American odds (+150) are used in the US. Most offshore books let you switch the display, but decimal is the default for Kiwi accounts.
Coast Cake Supplies is an independent guide. We do not operate any gambling service and take no bets. Operators listed are licensed offshore and accept New Zealand players. 18+. Gamble responsibly.