Sports Betting Calculators 2026: Returns, Margins and the Maths Behind Every Bet

Updated October 2026

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Most punters don’t need a calculator so much as a way to read the three numbers that decide whether a bet is worth placing. The stake, the odds and the margin between them govern every return, every free-bet promotion, every boosted-odds headline. A betting calculator is a way of making those numbers visible: the return on a winner, the value of a free bet whose stake isn’t returned, the share of turnover a bookmaker keeps across a whole market, and the betting volume a bonus demands before it pays out. In New Zealand, those mechanics are the same wherever you place a bet, yet only one provider is lawfully allowed to take one from you.

This page walks through the calculations, the terms that make a promotion expensive, and the comparison across bookmakers a New Zealand punter actually meets, from TAB NZ and its online sister brand Betcha, which hold the only lawful route under section 74AAA of the Racing Industry Act 2020, through offshore brands that operate outside that monopoly.

Current as of October 30, 2026. The licence status of every operator named has been checked against the Department of Internal Affairs’ position under the Racing Industry Amendment Act 2025.

Why the Maths Matters More Than the App

A betting calculator isn’t a tool for picking winners. Nothing does that. It is a tool for knowing what a winning bet pays back, what a losing streak costs, and whether a promotion is worth the turnover it demands. The marketing wraps every offer in a single headline number, the size of the bonus or the boost, and leaves the conditions to the small print. The calculator turns those conditions back into numbers a punter can compare.

Three calculations do almost all of the work:

• The return on a single bet, from the stake and the decimal odds.
• The margin the bookmaker keeps across a whole market, from the prices offered on every outcome.
• The turnover a bonus requires, and the average cost of clearing it, from the wagering multiple and the minimum price.

What follows is each of those worked through, then the rest of the page puts them beside the offers and bookmakers a New Zealand punter meets.

How to Read Decimal Odds

New Zealand bookmakers publish odds in decimal form. A $10 stake at odds of $2.10 returns $21 if the bet wins, comprising the $10 stake and $11 of profit. The formula is simple: return equals stake multiplied by odds, and net profit equals stake multiplied by odds minus one. For a combination bet, a multi whose legs come from different events, the odds of each leg multiply into one price, and that combined price is what the stake is multiplied by.

Same Game Multis, sometimes called SGMs, follow the same arithmetic. The legs come from one event, so a rugby Test multi might combine the winner, the first tryscorer and the total points into a single price, often a long one because correlated outcomes are harder for the bookmaker to price accurately. TAB NZ offers Same Race Multis and Same Game Multis alongside its standard Multi product, with a one-tap Popular Multi shortcut for the most-bet combinations.

The decimal price tells the punter one more thing: the implied probability the bookmaker attaches to the outcome. Odds of $2.00 imply a 50 per cent chance, odds of $4.00 imply 25 per cent, and so on. The lower the odds, the shorter the price and the more likely the outcome in the bookmaker’s view. The implied probability of any single outcome is one divided by the decimal odds. A $3.50 price implies roughly 28.6 per cent.

Two practical points sit on top of that:

• A “short-priced favourite” is a bet at odds below about $1.50. The implied probability is high, often above 67 per cent, but the return on a $10 stake is only $15, a profit of $5. The bet wins often, but the wins are small relative to the stake.
• A “long shot” is a bet at odds above about $10.00. The implied probability is below 10 per cent, the bet rarely wins, but a $10 stake returns $100 or more. Most multiples carry at least one leg at this kind of price.

The implied probability is a one-way mirror: the punter’s view of the chance is theirs to form, the bookmaker’s view is the price. A bet is “value”, in the loose sense the term carries in betting, when the punter’s estimate of the chance is higher than the bookmaker’s implied probability. That is a judgement, not a fact, and it is what the rest of this page sets up the reader to make for themselves.

The Margin: What the Bookmaker Keeps

Every price carries a built-in commission. The bookmaker does not charge the punter a fee, it builds its take into the odds, lowering each price below what a “fair” market is able to offer. The fair price on a two-way market, one with two outcomes that pay out roughly the same share of the time, is $2.00 on each side. A real bookmaker offers $1.90 on each side, and the difference between the fair price and the offered price is the margin.

The margin is calculated across every outcome of a single market. Take a two-way market priced at $1.90 on each side. The implied probabilities sum to one divided by $1.90 plus one divided by $1.90, which is 0.5263 plus 0.5263, or about 1.0526. The payout share, the proportion of every dollar bet that the market returns to punters in aggregate, is one divided by that sum, or about 95.05 per cent. The margin is one minus the payout share, or roughly 4.95 per cent in this example. In a band, a $1.90 / $1.90 market typically runs between 4.5 per cent and 5.5 per cent margin depending on rounding.

That means for every $100 bet across both sides of this market, the bookmaker keeps around $5 once the market settles. The punter’s edge is whatever their own estimate of the true probability is. The bookmaker’s edge is the margin, baked in before a ball is kicked.

A three-way market, the standard 1X2 on a football match, runs higher. With home win at $2.10, draw at $3.40 and away win at $3.50, the sum of implied probabilities is 0.4762 plus 0.2941 plus 0.2857, about 1.056. The margin is roughly 5.3 per cent, again in a band that depends on how the prices are rounded. A typical NRL head-to-head market sits in the 5 to 7 per cent range; a Super Rugby Pacific total-points line often runs higher because the bookmaker is less certain of the distribution.

Margin is why two bookmakers offering the same match at different prices are not offering the same bet. A $2.00 head-to-head on the All Blacks carries less margin than a $1.85 on the same outcome, and the difference compounds across every bet a punter places over a season. The punter does not need a calculator to see this; they need to compare prices across operators and choose the lower-margin side. Where the choice is between TAB NZ and an offshore brand, the lower-margin side is a fact the punter can check, not an assumption.

The margin also explains why accumulator bets are a poorer value than singles for the average punter, even though they pay more when they win. Each leg carries its own margin, and those margins multiply together across the multi. A four-leg multi on four markets at 5 per cent margin each carries a combined margin of roughly 19 per cent, meaning the market returns 81 per cent of stakes in aggregate. The punter’s chance of winning all four legs is much lower than the chance of winning any one of them.

Free Bets: What the Offer Is Worth

A free bet is the most common promotion across bookmakers, and the most mis-sold. The headline says $50 in free bets. The small print says the stake is not returned with a winning free bet, and the minimum odds for using the free bet are $1.50 or higher. The actual value of the offer depends on the odds the punter takes when they use it.

The formula: for a free bet whose stake is not returned, the expected value is the free-bet amount multiplied by odds minus one, divided by the odds, multiplied by the payout share of the market. A $50 free bet used at $3.00 odds, on a market with a 95 per cent payout share, has an expected value of $50 multiplied by $2.00, divided by $3.00, multiplied by 0.95. That is $50 × 0.6667 × 0.95, or about $31.67. The free bet pays back, on average across many uses, around $32 of real money, not the $50 the headline states.

That gap, between the headline figure and the realistic value, is the bookmaker’s margin on the promotion. Some of it goes to the punter who hits a long shot, but most of it stays with the bookmaker across the average of all free bets issued. A punter who uses a free bet on a heavy favourite, $1.50 odds, gets expected value of $50 × 0.50 ÷ 1.50 × 0.95, about $15.83. A punter who uses it on a long shot, $10.00 odds, gets $50 × 9.00 ÷ 10.00 × 0.95, about $42.75. The same $50 free bet pays back anywhere from $16 to $43 depending on the price the punter chooses.

The rule that follows: a free bet is worth more on a long shot than on a favourite, because the stake not being returned hurts less when the odds are higher. The punter who treats a free bet as “free money on a short-priced multi” leaves the most value on the table.

Some bookmakers offer “risk-free” bets that refund a losing stake as a free bet rather than cash. These are not refunds in money. The punter who loses their $20 risk-free bet gets $20 back as a free bet, which has the expected value calculation above. A risk-free bet is, on average, a free bet with smaller upside. The marketing calls it “risk-free” because the punter’s own cash is not at risk on the refunded stake. The bookmaker’s exposure is capped at the refund amount, and the punter’s upside is the refund’s expected value as a free bet.

Bonus Bets: The Turnover Trap

A bonus is harder to value than a free bet because the punter must turn the bonus amount over a set number of times before any winnings become withdrawable. TAB NZ’s new-customer offer, for instance, provides Bonus Cash that can be split across multiple bets. The terms attached to such offers typically include a wagering multiple, often five times the bonus, and a minimum odds requirement on each qualifying bet, often $1.50 or higher.

The arithmetic: required turnover equals the bonus base multiplied by the wagering factor. If the bonus is $100 and the factor is five times, turnover is $500. If each qualifying bet is $10, the punter must place 50 bets. Each bet must be at minimum odds of $1.50, which means each bet returns at most $15 for a $10 stake, of which $5 is profit. Across 50 bets, the maximum profit from the bonus alone is $250 before any of the punter’s own stake is counted.

The cost of clearing the bonus depends on the margin of the markets the punter bets on. The expected cost equals the required turnover multiplied by the margin of the market. A $500 turnover cleared on markets with a 5 per cent margin costs the punter, on average, $25 in expected value. That is the bookmaker’s take on the bonus. A $100 bonus with a $25 expected cost is worth $75 in real terms before the punter does anything. A $100 bonus cleared on a 7 per cent margin market costs $35 and is worth $65.

The conditions matter. A bonus whose turnover is calculated on the bonus plus the deposit, a “deposit + bonus” base, requires twice the betting volume of a “bonus only” base. A bonus whose qualifying bets must be on multiples rather than singles forces the punter into higher-margin products. A bonus with a 30-day expiry forces the punter to bet faster than they otherwise do, often on markets they do not normally take. None of these conditions appear in the headline figure, and all of them are where the book’s edge lives.

The punter’s question is not “is the bonus large” but “what does the bonus cost me to clear”. A $50 bonus with a low wagering factor and a long expiry is often worth more than a $200 bonus with a 10x factor and a seven-day window.

Same Game Multis and Bet Builders

Same Game Multis, sometimes called Bet Builders, let the punter combine several selections from one event into a single bet. TAB NZ’s Same Game Multi covers rugby, racing and other sports. Offshore brands such as Sportaza, BillyBets, LegendPlay, Golden Panda and 22Bet all offer a Bet Builder feature, and Sportaza’s terms specify that if one selection in a builder is void, the whole betslip is void.

The appeal is the same as a multi: the combined price is higher than any single leg. The arithmetic is the same too, except that the legs come from one event and are often correlated. A bet on the All Blacks to win, the All Blacks to score over 20.5 points, and Beauden Barrett to score a try, are three outcomes that move together. The bookmaker builds that correlation into the combined price, and the margin on a Same Game Multi is typically higher than on a comparable single bet.

The punter’s edge is the same calculation as on a multi: read the combined price, check what the same selections do pay as singles, and judge whether the difference is worth the convenience. A bet that pays $4.00 as a Same Game Multi but pays $4.50 as three singles is a worse bet, before any margin is counted, because the bookmaker has kept the extra $0.50 per $1 staked for the convenience of one bet slip.

The Risk Multi, a TAB NZ feature on its app, is a different product. The Mega Multi bonus pays up to $50 in Bonus Cash when a multi of four or more legs falls short by a set number of legs. The mechanics are: pick four or more legs, and if one leg fails the bet still gets a Bonus Cash refund based on a published table. The refund is a bonus, not a cash payout, and the wagering requirements on Bonus Cash apply.

Live Betting and Cash Out

Live betting, also called in-play, lets the punter place a bet after the event has started. TAB NZ’s app carries live betting on racing and a range of sports, with Trackside live race streaming and in-app betting on races around the country. Offshore brands such as 22Bet, FunBet, Rooster.bet, RTbet, Alawin and Sportaza all offer live betting with real-time odds and score updates.

The margin on live markets is generally higher than on pre-match markets, often 7 to 10 per cent or more, because the bookmaker is pricing into a fast-moving information environment. The punter who bets in-play is paying for the convenience of a price that responds to what is happening on the field, and that convenience has a cost.

Cash out is the feature that lets a punter lock in a win or a loss before the bet settles. RTbet’s terms specify that the cash-out amount is fixed at the moment the punter accepts, and that the feature is not guaranteed to be available at all times. Alawin’s cash out offers partial cash out, locking in a portion of the win or loss, and is not available on free bets or risk-free bets. Sportaza offers cash out before an event or market is finalised. Golden Panda’s terms cover live scoreboards and broadcasts alongside its cash-out and bet-builder products.

Cash out is not free. The cash-out price is below the true value of the bet at that moment, and the difference is the book’s take on closing the position early. A bet that might return $150 if it ran to settlement might cash out at $120, with the $30 kept by the bookmaker as the cost of the early settlement. The punter’s edge is whatever certainty the cash-out provides; the book’s edge is the difference between the cash-out price and the settlement value.

Boosted Odds and Accumulators

Boosted odds are a single price raised above the market rate, usually on a popular bet such as a head-to-head on the All Blacks or a favourite at the Melbourne Cup. The boost raises the price from, say, $1.85 to $2.00. The punter’s stake is paid at the boosted price if the bet wins. The book’s edge is that the boost is offered on markets the bookmaker is happy to take more action on, and on selections the bookmaker is confident are overpriced at the un-boosted price anyway.

TAB NZ’s app lists boosted odds in its menu, alongside Same Race Multis and Popular Multis. Ivibet’s menu names Boosted Odds and Copy Bets among its features. Tonybet lists Boosted Odds alongside its Forecasts product. LegendPlay’s promotions include a Sport Jackpot, a Virtual Sports Excitement offer, and an Acca Boost on winning accumulators.

An Acca Boost raises the payout on a winning multi by a percentage that grows with the number of legs. A 10 per cent boost on a four-leg multi adds 10 per cent to the payout. The same arithmetic applies as on a standard multi: the boost is paid on the combined price, the margin on each leg still applies, and the punter’s edge is whatever their estimate of the combined probability is.

A promotion that is easy to read in dollar terms is not always the most valuable. A $5 Acca Boost on a winning $50 multi at combined odds of $20 returns $10 extra, for a total return of $1010. A $50 free bet on the same multi returns the expected value calculation from earlier, around $25 in real money on a $50 free bet used at $20 odds. The free bet is more valuable, even though the headline dollar figure is larger for the Acca Boost.

TAB NZ and Betcha: The Two Lawful Brands

The two online brands of TAB NZ, TAB and Betcha, are the only operators lawfully allowed to take online sports and racing bets from people in New Zealand. Section 74AAA of the Racing Industry Act 2020, inserted by the Racing Industry Amendment Act 2025 and in force since 28 June 2025, prohibits any other person from offering racing betting, sports betting or other racing or sports betting to a person in New Zealand. The Department of Internal Affairs told unlicensed providers to withdraw with immediate effect, and there is no licensing route for another bookmaker and no licence register for betting.

TAB and Betcha are not rivals. They are the two online brands of the same operator, TAB New Zealand, which is the trading name of the New Zealand Racing Board. The two brands share account infrastructure, the same wallet, the same harm-minimisation tools, and the same safer-gambling framework. A punter with a TAB account can move funds to Betcha and back; a self-exclusion on one applies to the other.

The partnership that runs the betting operation is with Entain, the global gaming group, under a 25-year agreement signed in 2023. Entain operates the TAB business and shares gross profits 50/50 with TAB NZ, with a minimum payment of $150 million a year to TAB NZ for the first five years and a one-off $100 million payment to the racing sector at the start of the partnership. The deal brought Entain’s technology platform to TAB NZ’s customer base, and the Betcha brand was launched as the online-only sister to the established TAB retail and digital brand.

The fact that TAB and Betcha are the only lawful providers is the starting point for every other comparison on this page. Offshore brands may offer similar products at similar or better prices, but they are doing so in breach of New Zealand law, and the consequences for the punter are real: no New Zealand complaints route, no recourse to the Department of Internal Affairs, and the operator’s own terms govern every dispute.

TAB — Racing & Sports Betting

TAB is the established brand, with a retail footprint of betting outlets around the country alongside its digital presence. The app, published under the seller name New Zealand Racing Board, was first released on 8 September 2014 and carries racing coverage across thoroughbred, harness and greyhound codes, plus rugby union, rugby league and other sports, pre-match and live.

The product set is the full set of bet types defined in TAB NZ’s published betting rules: Win, Place, Each Way, Quinella, Exacta, Trifecta, First Four, Double, Treble, Daily Double, Running Double, Quaddie and Big6, plus the Multi product and Same Game Multi. Same Race Multis, Same Game Multis and one-tap Popular Multis are all in the app. Place Extra extends place betting to runners finishing up to 10th in selected races. The app also carries Trackside live race streaming with in-app betting, racing form, Blackbook and Jockey Challenge tools, and a simplified wallet for deposits and withdrawals.

The bonus structure includes Bonus Cash for new customers, split across multiple bets, and the Mega Multi bonus of up to $50 in Bonus Cash when a multi of four or more legs falls short by a set number of legs. The age requirement is 18, with a 17+ App Store age rating reflecting the betting content.

For a punter who wants the full New Zealand product — the retail integration, the racing form, the live streaming and the harm-minimisation tools that the regulator oversees — TAB is the reference. The downside is the price: TAB’s margins are not the lowest in the market, and a punter who shops around will sometimes find better odds at Betcha or, in breach of the law, at an offshore brand.

Betcha — Sports Betting

Betcha is the online-only sister brand, launched as the younger, more social alternative to TAB. The product is built around a small set of recurring features: a daily Toolbox with odds boosts and insurance tools for bets that do not land, a Bet Social section where punters chat, follow tipsters and share bets or pools, and a Playbook with tips and match analysis. The app is published on the New Zealand App Store as “betcha | Sports Betting”.

The bet types are the same as TAB, drawing on the same operator’s published betting rules. A Betcha account is a TAB NZ account, and funds, self-exclusion and harm-minimisation settings move between the two brands. The point of the separate brand is the social layer: the Bet Social feed, the tipster following, and the pools that turn a single bet into a shared activity.

For a punter who wants the social side of betting, the tipster feeds and the shared pools, Betcha is the relevant brand. The pricing is the same as TAB because it is the same operator, and the harm-minimisation tools are the same because the law requires them. A punter who is choosing between the two is choosing between TAB’s racing depth and Betcha’s social layer, not between two competing prices.

Offshore Brands: The Comparison

Every offshore brand listed below operates outside New Zealand’s licensing regime. None of them is licensed to take bets from people in New Zealand. The Department of Internal Affairs’ position is that an offshore bookmaker taking sports or racing bets from a person in New Zealand is breaking New Zealand law. The brand names a licence from another jurisdiction, often Anjouan, Curaçao, the Union of the Comoros or the Tobique Gaming Commission, which gives no right to take bets from people in New Zealand. There is no New Zealand complaints route and no harm-minimisation framework that reaches these brands.

The reason these brands are listed is that New Zealand punters meet them, through search results, through affiliate links, and through word of mouth. The comparison is the comparison the punter is able to make if they were choosing anyway: the product, the prices, the terms, and the gaps where the New Zealand protections do not reach.

Sportaza

Sportaza is one of the more feature-heavy offshore brands, with a sportsbook that covers single bets, accumulators, bet builders, Asian lines and interval markets in 1, 5, 10 or 15 minute ranges. The cash-out feature lets a punter lock in a position before the event or market is finalised, and the Bet Builder feature voids the whole betslip if one selection is void. The product is built for the punter who wants a wide market range and the finer-grained in-play options that TAB NZ’s app does not carry.

For a New Zealand punter, the gap is everything the offshore status removes. No New Zealand complaints route, no recourse to the Department of Internal Affairs, no guarantee that unspent credits are returned or that a large win is paid out. The product is competitive; the regulatory framework is not.

RTbet

RTbet offers cash out, with the cash-out amount fixed at the moment the punter accepts and a disclaimer that the feature is not guaranteed to be available. The brand sits in the middle of the offshore pack on features: cash out, live betting, the standard multi and singles product. The price is what the punter sees on the screen; the protection is what the punter does not have.

BetNinja

BetNinja’s licence is from the Union of the Comoros, an offshore jurisdiction with no consumer-protection framework equivalent to the Department of Internal Affairs’ role. The brand is a casino-led product with a sportsbook attached, and the comparison with TAB NZ is a comparison between a New Zealand-regulated operator and an offshore brand with no local reach.

Alawin

Alawin’s cash-out feature offers partial cash out, lets a punter lock in a win or loss before settlement, and is not available on free bets or risk-free bets. The brand’s licence is not one that applies in New Zealand. The product is comparable to the offshore pack as a whole, and the protection gap is the same as the rest.

Winz.io

Winz.io names Anjouan and Tobique licences, both held by the same operator group. The product set is casino-led, with a sportsbook attached. For a New Zealand punter, the question is the same as for any offshore brand: what does the product offer, and what does the regulatory framework not cover.

Rooster.bet

Rooster.bet is operated by Novatrix SRL, a Costa Rica company, under e-gaming licence No. 0000002 from the Tobique Gaming Commission. The sportsbook carries Live, Sports Promotions, Results, Schedule, E-sports and Predictions sections, and shows odds in six formats. The Costa Rica and Tobique licences do not give a right to take bets from people in New Zealand.

Rabona

Rabona launched on 23 December 2019 as the sixth online sportsbook of the Soft2Bet group. The brand’s licence is Curaçao-based, which gives no right to take bets from people in New Zealand. The product is a standard offshore sportsbook with the features the segment carries.

BetAlright

BetAlright accepts customers over 18 years of age only and runs a separate partners site. The brand names no licence that applies in New Zealand, and the standard offshore caveats apply. The product set is comparable to the segment.

BillyBets

BillyBets offers three odds formats, decimal, American and fractional, and a product set that includes cashback and reload bonuses on sports, a coin shop where coins collected through deposits, betting, tournaments and challenges can be exchanged for free bets and free spins, and a five-level VIP programme. The product is feature-heavy, the protection is the standard offshore gap.

Ivibet

Ivibet’s menu lists Sports Betting, Live Betting, Racing, Forecasts, Boosted Odds and Copy Bets alongside its casino and live casino sections. The Copy Bet feature lets a punter replicate the bets of tipsters on the platform, similar to Betcha’s Bet Social but on an offshore product. The brand’s licence is not one that applies in New Zealand.

Tonybet

Tonybet’s menu offers Casino, Live Casino, Prematch, Live Betting, Promotions, a VIP Club, Bettors Tournament, Forecasts, Boosted Odds and a Copy Bet feature. The product is broad, the segment is offshore, the comparison with TAB NZ is the comparison between a regulated New Zealand operator and a brand operating outside that regulation.

Golden Panda

Golden Panda publishes dedicated Sports Terms and Conditions covering fixed-odds betting, Combo Bets, the Bet Builder feature, live scoreboards and broadcasts, and stake and odds limits. The published terms are a positive signal in the offshore segment, where many brands keep their terms behind a login. The licence is not one that applies in New Zealand.

LegendPlay

LegendPlay’s promotions include a First Deposit Bonus, Weekly Reload Bonus, Sport Jackpot, Virtual Sports Excitement and Acca Boost. The product is promotion-heavy, the segment is offshore, and the protection gap is the standard one.

22Bet

22Bet takes single bets, accumulators, systems and chains, and offers live betting with real-time odds and score updates. The system and chain bet types are less common at New Zealand-facing brands and are part of the offshore product’s wider range.

FunBet

FunBet’s sportsbook offers odds on football, ice hockey, American football, basketball, volleyball, tennis, rugby and baseball, with live betting and accumulators and bet builders. The bookmaker is described as open 24/7. The product is a standard offshore sportsbook, the segment is offshore, the protection gap is standard.

The Comparison Table

The table below covers the brands a New Zealand punter is most likely to meet. The first two are the lawful New Zealand providers, both under TAB NZ. The remaining brands are offshore, named here because the punter sees them, and marked accordingly. The “key terms” column summarises what the operator’s own terms state on the subjects covered in the body of this page.

The table does not rank one brand against another. Two of the brands, TAB and Betcha, sit in a different regulatory category from the rest, and the comparison the punter is making is not a comparison of features so much as a comparison of what each brand offers and what each brand’s framework does and does not provide.

The Fundamentals: What Every Punter Needs to Know

The mechanics in the first half of this page are the same wherever a bet is placed. Stake times odds equals return. The sum of one over each decimal price equals the market’s total implied probability. The difference between that sum and 100 per cent is the margin. A free bet whose stake is not returned is worth its amount times odds minus one, divided by the odds, times the market’s payout share. A bonus requires a turnover equal to its base times its wagering factor, and costs that turnover times the market’s margin on average.

Those four formulas cover most of what a punter needs to compare offers. The remaining fundamentals are the conditions that make the formulas work in practice:

• A market’s margin depends on the event, the sport and the bookmaker. The same sport, the same event, can carry different margins at different bookmakers, and the punter who checks more than one price is the punter who pays the lowest margin.
• A free bet’s value depends on the odds the punter takes when using it. The same $50 free bet is worth more at $10.00 than at $1.50, because the stake not being returned hurts less when the odds are higher.
• A bonus’s value depends on the wagering factor, the minimum odds, the expiry, and the markets the punter is forced to bet on. The headline figure is the gross bonus; the expected value is the bonus minus the cost of clearing it.
• A multi’s margin is higher than the margin of any single leg, because the leg margins multiply. A four-leg multi on 5 per cent margin markets carries about 19 per cent combined margin.

The fundamentals do not tell the punter which bet to place. They tell the punter what each bet is worth in dollar terms, and what each bet costs in expected value. The choice between two bets, both with positive expected value, is the punter’s own judgement of the probability. The calculator does the arithmetic; the punter does the rest.

Responsible Gambling: The Tools That Exist

The tools that exist for New Zealand punters are the tools that TAB NZ provides in its app and the wider harm-minimisation framework that the regulator oversees. The app carries deposit limits, time-outs and self-exclusion, and an exclusion applies across TAB and Betcha because they are the same operator.

The self-exclusion is a request to TAB NZ to close the account for a set period, after which the punter cannot reopen without a cooling-off period. The deposit limit is a cap on the amount the punter can deposit in a day, a week or a month. The time-out is a shorter break, often 24 hours to several weeks, in which the account is locked. All three are operator-level, which means they apply to TAB and Betcha but not to any offshore brand the punter might also use.

There is no single national online-betting exclusion register. The register that the Online Casino Gambling Act 2026 will require is for online casinos only and does not extend to sports betting. A punter who self-excludes from TAB NZ can still open an account with an offshore brand, and the offshore brand’s own exclusion framework is the only one that applies. The Department of Internal Affairs’ position is that offshore brands operating against section 74AAA do not provide the New Zealand harm-minimisation framework, and the punter who uses them is outside the local protections.

The free Gambling Helpline is 0800 654 655, with a text line at 8006. Safer Gambling Aotearoa is the broader information service. TAB NZ must keep the risks of problem and underage gambling minimised, and pays a Problem Gambling Levy of 0.74 per cent of its gross profits, in force from 1 July 2025 to 30 June 2028. The levy funds the harm-minimisation services, the helpline and the public-health response to gambling harm.

The age for TAB NZ betting is 18. Land-based casinos are 20, a separate rule that does not extend to betting. The TAB NZ app carries a 17+ App Store age rating while the terms state customers must be 18 or over to bet. Account opening requires a verified New Zealand address and ID. The punter who cannot verify a New Zealand address cannot open a TAB NZ account, and the offshore brand’s verification is the only one that applies.

Inland Revenue’s position is that recreational gambling winnings are generally not taxable, and prize money from TAB horse, dog and trotting races is not taxable. A punter who bets as a business is a different case, and the general advice is to consult Inland Revenue or an accountant. The operator side of the tax is the Problem Gambling Levy for TAB NZ and online gambling duty for offshore brands, but a duty being payable does not make an offer lawful.

The Legal Landscape: Section 74AAA and What It Means

The Racing Industry Amendment Act 2025 inserted section 74AAA into the Racing Industry Act 2020, and the change took effect on 28 June 2025. The section prohibits any person other than TAB NZ from offering racing betting, sports betting or other racing or sports betting to a person in New Zealand, regardless of where that person is resident or incorporated. The Department of Internal Affairs told unlicensed providers serving New Zealand to withdraw with immediate effect.

The law targets the operator, not the player. Section 19(4) of the Gambling Act 2003, inserted in 2025, says an individual may not be convicted for placing a bet with an offshore betting operator in breach of section 74AAA. The penalty for the operator is not stated in the section itself, and no prosecution of an offshore bookmaker has been published. The safe framing is: TAB NZ and Betcha are the only lawful option, with New Zealand harm-minimisation tools, regulator oversight and a complaints framework; offshore brands are unlawful for the operator to serve New Zealand, with no New Zealand complaints route, the regulator’s stated risks, and the limits the punter accepts when choosing them.

New Zealand does not geo-block offshore websites. The law puts liability on the offshore operator, not on the New Zealand punter’s internet connection. The punter who chooses an offshore brand is making a choice outside the New Zealand framework, and the consequences — the lack of recourse, the lack of harm-minimisation tools, the risk that a large win is not paid out — are the punter’s to weigh.

The Online Casino Gambling Act 2026 licenses online casino gambling only and does not license sports betting. TAB New Zealand winning the right to apply for a casino licence does not extend the betting monopoly. The two products, casino and betting, are separate permits with separate rules, and a casino licence is not a betting licence.

Greyhound racing is closing in stages from 1 August 2026, and from that date offshore operators may not take bets on greyhound races either. The greyhound ban is a separate provision, layered on top of the section 74AAA monopoly, and the punter who bets on greyhounds after 1 August 2026 is betting on a closed product regardless of which brand takes the bet.

The Advertising Standards Authority’s Gambling Advertising Code applies to betting advertisements in New Zealand. Ads must not target children (under 14) or young people (14 to under 18), judged by context, appeal and expected audience. Where accurate audience data exists, 25 per cent or more of the audience under 18 counts as significant. Ads must not encourage harm, must be truthful, and must have terms available. There is no New Zealand equivalent of a “whistle-to-whistle” ban for betting, and how the Department of Internal Affairs treats betting affiliates is not established in published guidance.

Bonuses and Free Bets in Detail

The bonus and free-bet mechanics from earlier apply across operators, but each operator structures its offers differently. The sections below cover the most common shapes and what they cost the punter who clears them.

New-Customer Offers

A new-customer offer is the headline promotion a bookmaker uses to attract sign-ups. At TAB NZ, the new-customer offer is Bonus Cash that can be split across multiple bets, with the Mega Multi bonus as an add-on for multi-bettors. At offshore brands, the new-customer offer is typically a matched deposit bonus — deposit $100, get a $100 bonus — with a wagering factor of five to ten times the bonus amount, a minimum odds requirement, and an expiry of seven to thirty days.

The arithmetic from earlier applies. A $100 matched deposit bonus with a 5x wagering factor on the bonus only requires $500 turnover. At a 5 per cent market margin, the expected cost is $25, and the bonus is worth $75 in expected value. The same bonus with a 10x factor on the bonus plus deposit requires $2,000 turnover at 5 per cent margin, costing $100 in expected value. The $100 bonus is, in the second case, worth $0 on average, before the punter’s own time and the risk of busting out before clearing.

The punter who reads the headline figure is being told the gross. The punter who reads the wagering factor, the bonus base, the minimum odds and the expiry is being told the net. The two figures are very different, and the net is the one the punter needs to compare.

Existing-Customer Offers

Existing-customer offers are the promotions a bookmaker runs to keep active punters betting. The most common are odds boosts on selected markets, Acca Boosts on winning accumulators, and insurance offers that refund a losing stake as a free bet or bonus cash.

TAB NZ’s daily Toolbox on Betcha, the odds boosts and insurance tools for bets that do not land, is the existing-customer offer at the New Zealand-regulated operator. Offshore brands such as LegendPlay run a Weekly Reload Bonus, a Sport Jackpot and an Acca Boost, while BillyBets runs a coin-shop mechanic where coins collected through deposits, betting, tournaments and challenges can be exchanged for free bets and free spins.

The same arithmetic applies. An odds boost that raises a price from $1.85 to $2.00 is worth $0.15 per $1 staked if the bet wins, and zero if it loses. A punter who takes a boosted bet at $2.00 instead of an un-boosted bet at $1.85 on the same outcome is paying nothing for the boost when the bet loses and gaining $0.15 per dollar when the bet wins. The book’s edge on the boost is the difference between the boosted price and the price the book intended to offer on a market the book wanted more action on, which is usually a market the book was confident was overpriced at the un-boosted price.

Free Bet Clubs and Loyalty Programmes

A free bet club is a recurring offer that rewards the punter for a set volume of betting. The most common shape is “place $50 in singles in the week, get a $10 free bet”. The punter who opts in and places the qualifying bets receives the free bet the following week, with the standard free-bet terms applying: stake not returned, minimum odds of $1.50 or higher, expiry of seven days.

The expected value is the same as the free-bet calculation. A $10 free bet used at $3.00 odds on a 95 per cent margin market returns about $6.33 in expected value. The punter who placed the $50 in qualifying bets paid the book’s margin on those bets, around $2.50 at 5 per cent margin. The net gain is the free-bet value minus the qualifying cost, about $3.83 on these inputs.

A loyalty programme is a points-based system where the punter earns points for betting volume and exchanges them for free bets, bonuses or other rewards. BillyBets runs a five-level VIP programme alongside its coin shop. The same arithmetic applies: the points are worth the free bets or bonuses they convert to, and the qualifying bets paid the book’s margin.

Predictions and Strategy: What Calculators Cannot Do

A betting calculator does not predict outcomes. The same calculation that values a free bet at $32 on a $3.00 market also values it at $16 on a $1.50 market, and the punter’s estimate of the probability is the input the calculator cannot supply. The system and strategy tools in the market — the Labouchere staking system, the reverse forecast bet, the matched-bet calculator — are ways of structuring the punter’s staking, not ways of finding winners.

A staking system is a rule for how much to bet on each selection. The Labouchere system, also called the cancellation system, starts with a target profit and a list of numbers that sum to that target. The punter bets the sum of the first and last numbers, crosses them off if the bet wins, and adds the bet amount to the end of the list if the bet loses. The system does not change the expected value of each bet; it changes the variance. A punter who runs the Labouchere system at a 5 per cent market margin still loses 5 per cent of turnover on average, and the system determines the size and frequency of the wins and losses along the way.

A matched-bet calculator is a tool for finding arbs and bonuses that can be locked in for a guaranteed profit, typically by backing one side at a bookmaker and laying the other side at a betting exchange. In New Zealand, no lawful betting exchange exists and spread betting is outside TAB NZ’s sports-betting definition. The matched-bet approach is not available to a New Zealand punter using only TAB NZ, and using an offshore exchange alongside an offshore bookmaker is the same regulatory problem as using an offshore bookmaker alone.

A reverse forecast bet is a bet on two runners to finish first and second in either order, common in horse racing. The bet type is on TAB NZ’s published list, with the Quinella covering the same product. The calculation is the same as on a win bet: stake times odds, with the odds adjusted for the dead-heat and withdrawal rules in TAB NZ’s published terms.

The calculator’s role is to make the mechanics visible. The punter’s role is to decide whether the bet is worth placing. The two are different jobs, and no system closes the gap between them.

How to Choose: A Practical Frame

The choice for a New Zealand punter comes down to three questions, and the order matters.

The first question is regulatory. TAB NZ and Betcha are the only lawful providers. Any other brand is operating outside the New Zealand framework, and the punter who uses one accepts the limits that come with that choice: no New Zealand complaints route, no recourse to the Department of Internal Affairs, and the offshore brand’s own terms governing every dispute. The punter who is not comfortable with that is advised to use TAB NZ or Betcha.

The second question is product. TAB NZ and Betcha offer the full New Zealand product, including racing, multis, same-game multis, boosted odds, cash-out where available, and the live streaming on Trackside. Offshore brands offer a wider range of markets in some cases, with the bet builder, Asian lines and interval markets that TAB NZ does not carry, and the broader esports and virtual sports offering. The punter who wants the widest market range and is comfortable with the regulatory gap may choose an offshore brand for the product alone.

The third question is price. Margins differ across operators, and the punter who checks more than one price on the same selection is the punter who pays the lowest margin. TAB NZ and Betcha carry the same prices because they are the same operator. Offshore brands sometimes offer sharper prices on headline events, sometimes wider margins, and the punter’s job is to check. The calculator makes the comparison visible: the same selection at $1.90 and $1.85 is a 1 per cent margin difference, which compounds across a season of betting.

The punter who wants the safest framework chooses TAB NZ or Betcha. The punter who wants the widest product range and is comfortable with the regulatory gap chooses an offshore brand. The punter who wants the best price checks both and bets where the margin is lowest. The three questions are not mutually exclusive, and the punter’s answer to each is the punter’s own.

The Full Landscape in One View

The pages above cover the mechanics, the brands, the legal framework and the choices. The summary in one view is this:

• The arithmetic: stake times odds equals return; sum of one over each price equals implied probability; one minus the payout share equals the margin; free-bet value is the amount times (odds minus one) divided by odds times payout share; bonus value is the gross minus the cost of clearing it, where the cost is turnover times the market margin.
• The two lawful New Zealand brands are TAB and Betcha, both operated by TAB NZ under section 74AAA. They share infrastructure, harm-minimisation tools and prices.
• The offshore brands are many, and the comparison above is the comparison the punter is able to make: product, terms, and the regulatory gap that the section 74AAA framework creates.
• The harm-minimisation tools at TAB NZ are deposit limits, time-outs, self-exclusion and the Gambling Helpline. The offshore brands do not provide the New Zealand framework.
• The age requirement is 18 for TAB NZ betting. The tax treatment of recreational gambling winnings is generally not taxable.

The full landscape is wider than the page can show. New brands enter the offshore market every year, and the products at TAB NZ change with the racing and sporting calendar. The mechanics on this page are the mechanics that govern every bet, and the comparison is the comparison a New Zealand punter makes when choosing where to place one.

Frequently Asked Questions

Which bookmaker may lawfully take sports and racing bets in New Zealand?

TAB NZ and its online sister brand Betcha are the only operators allowed to take online sports and racing bets from people in New Zealand. The Racing Industry Amendment Act 2025 inserted section 74AAA of the Racing Industry Act 2020, in force since 28 June 2025, and the Department of Internal Affairs told unlicensed providers to withdraw with immediate effect.

How is the return on a bet worked out from the stake and the odds?

The return is the stake multiplied by the decimal odds. A $10 stake at $2.10 returns $21 if the bet wins, comprising the $10 stake and $11 of profit. For a multi, the odds of each leg multiply into one combined price, and the stake is multiplied by that combined price.

What is the bookmaker’s margin and how can it be seen in the odds?

The margin is the share of every dollar bet that the bookmaker keeps across a market. It is calculated as one minus the payout share, where the payout share is one divided by the sum of one over each decimal price. A two-way market at $1.90 on each side carries a margin of roughly 5 per cent. The lower the margin, the better the price for the punter.

What does a punter lose by betting with a bookmaker that has no New Zealand licence?

The punter loses the New Zealand harm-minimisation framework, the Department of Internal Affairs’ oversight, and the New Zealand complaints route. The Department of Internal Affairs warns that overseas operators may be in jurisdictions with minimal consumer safeguards, may not return unspent credits, and may not pay out large wins. The offshore brand’s own terms govern every dispute.

From what age can bets be placed with TAB NZ, and what is checked when opening an account?

The age for TAB NZ betting is 18, and account opening requires a verified New Zealand address and ID. The TAB NZ app carries a 17+ App Store age rating while the betting terms require customers to be 18 or over. The age for land-based casinos is 20, a separate rule that does not extend to betting.

Are betting winnings taxed in New Zealand?

Inland Revenue’s position is that recreational gambling winnings are generally not taxable, and prize money from TAB horse, dog and trotting races is not taxable. A punter who bets as a business is a different case, and the general advice is to consult Inland Revenue or an accountant for that situation.

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