Sports betting calculators 2026: the cost behind every price

Updated October 2026

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Available in US

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A betting calculator is, at heart, a small piece of arithmetic: stake multiplied by price gives what a winning bet returns, and the bookmaker’s margin sits inside the price the calculator uses. Most calculators built for New Zealand bettors in 2026 add a second job on top of that arithmetic — they show, line by line, what an offer such as a bonus bet is really worth once you account for the wagering, the expiry and the markets the offer applies to. This page is built around that second job. Every section looks at what the calculator’s answer costs the punter who acts on it: the turn of the math, the cut the bookmaker keeps, and the price a New Zealand bettor pays when the operator behind the calculator is not licensed in New Zealand at all.

*TAB NZ’s online platform is the only legal provider of online sports betting in New Zealand, and this calculator assessment (as of October 30, 2026) is based on the consumer protection standards and regulatory oversight established under the Racing Industry Act 2020.*

The state of the data, for readers checking this page in 2026: figures were checked against TAB NZ’s published betting rules and against the New Zealand Department of Internal Affairs register as the regulator that monitors compliance with section 74AAA of the Racing Industry Act 2020.

Selection comparison

The two names at the top — TAB and Betcha — share a single New Zealand licence. The eight that follow have no New Zealand licence and have no route into the local dispute resolution process; the calculator you use on them is doing its math on the same numbers as the one on TAB, but the operator sitting behind it cannot lawfully take your bet. A punter who picks a calculator by feature alone is ignoring the operator’s status.

The fundamentals behind a betting calculator

Three numbers do almost all the work: the stake, the decimal price and the number of legs in a multi. From them the calculator draws the rest — what a single returns, what a multi returns when each leg wins, what the same multi returns when one leg voids, what happens to a Bonus Cash stake, and what a partial cash-out lock leaves on the table.

A single bet pays stake multiplied by price. A $10 bet at $2.10 returns $21.00 if it wins, leaving $11.00 of profit after the $10 stake is taken off. That is the cleanest number the calculator produces, and most calculators get it right without much ceremony. The interesting case is the multi — what New Zealand bookmakers call a multi bet, several selections in one slip, where each leg’s price multiplies into one combined price. Five legs at $1.60, $1.80, $2.00, $2.20 and $1.90 produce a combined price that is the product of those five figures rather than their average. The calculator’s job is to multiply them and multiply the result by the stake, and to flag — quietly — that every multiplication step adds the bookmaker’s cut, so a five-leg multi with the same margin as a single carries that margin five times over.

A same-game multi takes its legs from one event and multiplies them the same way. The TAB NZ app and Betcha both list same-game multis as a standard product. The point a calculator makes when it lets you tick “same game multi” is that one event means correlated legs — a goal makes a next-goal market more likely, a wicket makes a next-wicket market more rare — and the price the bookmaker quotes already discounts for that. The discount is the bookmaker’s margin and it is harder to see on a multi than on a single, because the combined price looks larger than any of its parts and the punter rarely asks whether each part was generous.

The third job, and the one most calculators hide rather than expose, is what to do with a void leg. A multi with five selections in which one is voided: most bookmakers settle the multi on the remaining four legs at the combined price of those four. A Bet Builder at one offshore brand works the same way with the additional rule that a void selection voids the whole betslip. A calculator that shows both outcomes side by side, before the bet is placed, is doing the punters a real service. The bet builder feature at one of the brands in the table below voids the entire slip on a single void leg; a calculator that lets you tick “void leg: whole slip” rather than “void leg: re-multiply” is showing the cost of that rule in dollar terms before the bet goes on.

The landscape under section 74AAA

Since an amendment to the Racing Industry Act 2020 took effect on 28 June 2025, TAB NZ and its online sister brand Betcha are the only operators allowed to take online sports and racing bets in New Zealand. The Department of Internal Affairs told unlicensed providers to withdraw with immediate effect, and the Racing Industry Amendment Act 2025 inserted section 74AAA to put that instruction into statute: no person other than TAB NZ may offer 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 law targets the operator, not the punter — section 19(4) of the Gambling Act 2003, also inserted in 2025, says an individual may not be convicted for placing a bet with an offshore betting operator in breach of section 74AAA — but the regulator has been explicit about the risks: overseas operators may be in jurisdictions with minimal consumer safeguards, may not return unspent credits and may not pay out large wins.

There is no licensing route for another bookmaker and no licence register for betting, because there is only one lawful provider. Betcha and TAB are the two online brands of TAB New Zealand; they are run under a 25-year partnership TAB NZ signed with Entain in 2023, with a 50/50 share of gross profits and at least $150 million a year going to TAB NZ for the first five years, plus a one-off $100 million payment Entain pledged to the racing sector. The Online Casino Gambling Act 2026 changes nothing about sports betting — it licenses online casino gambling only. Greyhound racing is closing in stages from 1 August 2026, and from that date offshore operators may not take bets on greyhound races either, because the racing itself is no longer being held.

What this means for a calculator: the price the calculator uses is the same number whoever the operator is, but the operator is not a number. A calculator that returns the same $21.00 to a TAB customer and to an offshore customer is telling two punters the same thing about two very different bets. The TAB bet has a New Zealand harm-minimisation framework, a complaints route, a verified account requirement, deposit limits and a self-exclusion that applies across both TAB brands; the offshore bet has none of that, and the operator behind it has been told to withdraw from the market by the regulator. The arithmetic is identical. The cost is not.

A stake × price worked, not a consensus

A two-way market at decimal odds 1.90 / 1.90 — a deliberately even example, not a quoted price — carries a bookmaker’s margin that runs in a narrow band roughly between 4.5% and 5.5%. The number falls out of the price itself: the payout share is 1 ÷ (1/1.90 + 1/1.90), which is just under 95%, and the margin is whatever brings that share to a round 100. Move one side of the market to $2.10 and the other to $1.75 and the margin widens. Move both to $1.95 and it tightens. The point is not the number; the point is that every price the calculator shows carries a margin, even the question of “what is this bet worth” — and the calculator’s job is to surface the margin when the punter asks, not only when the punter notices it.

The reason this matters on a multi: the margin compounds. A two-leg multi with both legs at 1.90 / 1.90 carries the margin of one market times two. A five-leg multi carries it five times. A same-game multi at an offshore brand with a stated 7% margin on singles carries that 7% across every leg, and the calculator showing the combined price rarely shows that the combined price is the less-thanked expression of a margin the punter paid leg by leg. The comparison: at the same five selections and the same stake, a single $10 stake at the combined price pays the same when all five win, but loses one bet, and loses five times the margin. The punter pays the margin every time. The combined price does not change that.

A free bet — what TAB NZ calls a Bonus Cash stake — adds another layer. Where the stake is not paid back with a win, the value of the free bet is the bonus amount multiplied by (price − 1) divided by price, multiplied by the payout share of the market it is placed on. For a $20 Bonus Cash stake at $2.50 in a market with a 95% payout share: 20 × (2.50 − 1) ÷ 2.50 × 0.95 = $11.40 of expected value, not $30. The arithmetic says the offer is worth roughly $11.40 on average, not the headline $20, and a calculator that shows both numbers is doing the work.

The cost of a “free” bet calculator

A free bet calculator, in the matched-betting sense, is built for one job: to take a back bet at a bookmaker and a lay bet at an exchange, and to show the size of the lay stake that returns the same amount whether the selection wins or loses. A matched-betting calculator in New Zealand is doing its math on a bet structure that does not exist here. There is no lawful New Zealand betting exchange; the Racing Industry Act 2020 defines sports betting as TAB NZ’s product, and a lay bet on the TAB NZ platform is not on the published menu. The arithmetic still works — stake, back price, lay price, lay commission, free-bet value — and a calculator imported from a market that has exchanges will return a number. The number is the cost of a bet the New Zealand punter cannot place. The matched-betting calculator, used in New Zealand in 2026, is doing arithmetic on a bet that does not exist, and the punter who uses it is paying for an answer that does not apply.

The same goes for an arbitrage calculator. Two bookmakers, two prices on the same selection, a stake split that locks in a profit whatever the outcome. The arithmetic is clean and the calculator shows a small, projected profit on each outcome. The catch, in New Zealand, is that one of those two bookmakers is not licensed in New Zealand. The arbitrage calculator has no field for that. The punter looking at the small profit is looking at a small risk on the bet that does not exist in the first place. The offshore leg of the trade is the leg the regulator told the operator to stop taking. A 2% gain at one unlicensed bookmaker and one TAB bet is an unlawful bet, and the offshore leg’s refusal to pay out — which DIA’s warning lists as a known risk — is a cost the arbitrage calculator has not priced.

Bonus bets and rollover: what the calculator shows after the headline

TAB NZ’s app lists Bonus Cash that new customers can split across multiple bets, and a Mega Multi back-up 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 terms apply. A punter at the head of the offer sees the $50 and is writing “Bonus Cash” rather than the deal’s full description. The calculator’s job on a bonus offer is to take the headline number apart:

• the bonus amount and how it splits — a $50 Bonus Cash split across five $10 stakes is not the same value as $50 in one stake, because each split stake pays the bonus’s value only when it wins, and the more splits the more variance the punter must absorb;
• the qualifying bet — what stake, at what minimum price, must be placed before the bonus pays out, and which markets count;
• the expiry — how long the bonus is good for, and what happens to any unspent bonus when that window closes;
• the markets — same-game multis, racing multis, sport-specific markets, and the markets the offer does not cover.

Each of these is one thing the punter pays for ignoring. A $50 bonus with a seven-day expiry is a $50 bonus that is worth whatever the punter can put on the right markets in seven days; a calculator that shows the time decay — what the bonus is worth at day seven, day three, day one — is showing the cost of waiting. A $50 bonus with a minimum price of $1.50 on each leg is a $50 bonus that excludes every short-priced favourite; the second asks the punter to take the leg the bookmaker is taking less of a cut on, and the calculator shows which legs the offer lets through and which it does not.

Offshore brands carry their own bonus terms. BillyBets lists cashback and reload bonuses on sports, plus a coin shop where coins collected from deposits, betting, tournaments and challenges are exchanged for free bets and free spins, and a five-level VIP programme. LegendPlay lists a First Deposit Bonus, a Weekly Reload Bonus, a Sport Jackpot, a Virtual Sports Excitement promotion and an Acca Boost. Tonybet lists a Bettors Tournament and a Copy Bet feature alongside its promotions. Each of these has terms the calculator does not see; each of them is on a brand that is not licensed in New Zealand; the cost of the offer is the cost of the bet, the cost of the rollover, the cost of the expiry and the cost of an operator the regulator has told to stop taking New Zealand bets.

The margin, in plain numbers

The bookmaker’s margin is the cut the bookmaker keeps of every dollar bet on a market. A market with 95% payout share has a 5% margin. A market with 90% payout share has a 10% margin. A two-way market with both sides at $1.90 has a payout share of just under 95% — 1 divided by (1/1.90 + 1/1.90) — and a margin of just over 5%. A market with one side at $1.50 and the other at $2.80 has a wider margin; the favourite at $1.50 pays less of the stake than the price suggests and the underdog at $2.80 pays more, and the corner between them is the margin.

The band, not the figure. Most mainstream sports markets at licensed operators run with a margin somewhere between 4% and 8% on the headline price. Outright markets, exotic markets, in-play markets on niche events and any market with thin liquidity run wider — 10% to 15%, sometimes more. A multi with five legs carries five times the margin of a single leg, and the combined price looks generous because it is large. A same-game multi with a stated 7% margin on singles carries that 7% on each leg. The margin does not get smaller when the price gets larger; it gets larger, on average, because each multiplication step adds the leg’s margin to the running total.

What the calculator does not show. A bookmaker can change the margin on a market without changing the headline price. A market with the favourite at $1.50 and the underdog at $2.80 is a 7% margin bookmaker’s margin; a market with the favourite at $1.55 and the underdog at $2.60 is a 7% margin bookmaker’s margin on a different shape of price. The arithmetic that compares the two markets looks at the payout share, not the headline; the calculator that compares them does the same. A punter choosing between two prices on the same selection is choosing between two margins, and the calculator’s job is to show the choice in margin terms rather than in headline terms.

Bet types the calculator handles

A bet calculator covers, at minimum: singles, multis, each-way bets, Yankees and other system bets, and the bet builder — what one offshore brand calls Bet Builder and what the same brand voids the entire betslip on if any leg voids. A multi is several selections in one slip, and each leg’s price multiplies into one combined price. A same-game multi is a multi whose legs come from one event. An each way is a win bet and a place bet of equal stake on the same selection, with the place paying a fraction of the win. A Yankee is eleven bets on four selections — six doubles, four trebles and one four-fold — and the calculator’s job is to show what each combination pays when each selection wins.

The TAB NZ betting rules add a layer New Zealand calculators do not always show: Win, Place, Each Way, Quinella, Exacta, Trifecta, First Four, Double, Treble, Daily Double, Running Double, Quaddie and Big6 — the racing bet types a multi-leg racing bet is built from. Place Extra lets punters back runners to finish up to tenth in selected races, which is an each-way variant with a deeper place. The TAB NZ app lists Same Race Multis, Same Game Multis and one-tap Popular Multis as standard products, and Trackside live race streaming with in-app betting. A calculator that handles racing multis needs a field for the dividend, the tote payout, which is settled after the race and is not known in advance. The calculator that pretends the dividend is the same as a fixed-odds price is doing the math wrong, and a New Zealand punter who relies on it is paying for a wrong number.

The same-game multi at an offshore brand: a calculator that lets the punter choose between “void leg: re-multiply” and “void leg: whole slip” is doing the work. The first option keeps the multi alive on the remaining legs; the second kills the whole betslip. The difference between them is the difference between a four-leg multi at a reduced price and a losing bet, and a calculator that does not show both is hiding the cost of the rule the operator wrote.

What a forecast bet is, and what a rule costs

A forecast bet, in the racing sense, is a bet on the first two finishers in a race in the correct order — an Exacta. A reverse forecast is the same two finishers in either order — a Quinella. A tricast is the first three in order; a reverse tricast is the first three in any order. The calculator’s job on a forecast is to take the dividend, the payout per $1 stake, and multiply by the punter’s stake; the dividend is settled after the race and is not known at bet time, which is why forecast calculators carry a “dividend: TBD” field rather than a price.

A betting system — a Labouchere, a Fibonacci, a Martingale — is a staking plan that adjusts the stake after each bet according to a rule. The Labouchere system uses a sequence of numbers where each stake is the sum of the first and last number in the line, with the line shortening on a win and lengthening on a loss. A Fibonacci system stakes according to the Fibonacci sequence. A Martingale doubles the stake after each loss. A calculator for any of these systems is doing two jobs at once: it is showing what each individual bet pays at the price the punter has chosen, and it is showing what the sequence of stakes does to the bankroll over a run of wins and losses. The first job is arithmetic; the second is a simulation, and it depends on the assumption the punter makes about the win rate. A Martingale looks like a plan on paper until the punter assumes the wrong run of results and the stake walks off the table.

The cost of a system. Every system costs the punter the margin on every bet placed. A Labouchere at 1.90 / 1.90 over twenty bets places twenty bets at the same market margin. The expected loss is the margin times the total turnover, not the largest single stake. A calculator that shows the system’s largest stake and the system’s expected loss side by side is showing the cost of the system in two numbers — the most the punter can lose on a single losing streak, and the most the punter is expected to lose across a long run of bets at the same margin. The first number is the cost of the worst case; the second is the cost of the average case. They are different numbers and the punter who confuses them is paying for a misreading.

A bet type and its odds format

Decimal odds ($2.10) are what New Zealand calculators work in, and what TAB NZ publishes. American odds (+110) and fractional odds (1/1) are also handled by the lines BillyBets lists; RoyalistPlay shows odds in European, British, Hong Kong, American, Indonesian and Malaysian formats. The calculator’s job across formats is to show the same stake multiplied by the same implied probability in different notation. A $2.00 decimal is a 50% implied probability; a +100 American is a 50% implied probability; a 1/1 fractional is a 50% implied probability. The conversion is mechanical and a calculator that does it in both directions is showing the punter that the price has not changed when the format has.

The 22Bet sportsbook menu takes single bets, accumulators, systems and chains, with live betting and real-time odds and score updates. FunBet covers football, ice hockey, American football, basketball, volleyball, tennis, rugby and baseball, with live betting and an open-24/7 bookmaker, plus accumulators and bet builders. Rooster.bet’s sportsbook has Live, Sports Promotions, Results, Schedule, E-sports and Predictions sections and shows odds in six formats. Ivibet’s menu lists Sports Betting, Live Betting, Racing, Forecasts, Boosted Odds and Copy Bets. Golden Panda publishes dedicated Sports Terms covering fixed-odds betting, Combo Bets, the Bet Builder feature, live scoreboards and broadcasts, and stake and odds limits. Each of these is a feature the calculator has to know how to handle; each of them is on a brand that is not licensed in New Zealand.

Responsible gambling: what the calculator does not do

The calculator does not stop the punter from staking more than the punter can afford to lose. The calculator shows what a bet pays, what a multi pays, what a system does to a bankroll over twenty bets; the calculator does not indicate whether the punter is able to place any of those bets. The decision is the punter’s, and the framework around it is set by the operator and the regulator.

TAB NZ’s safer-gambling tools: deposit limits, time-outs and self-exclusion, all available in the TAB NZ app. An exclusion at TAB applies across both TAB NZ brands — TAB and Betcha. The free Gambling Helpline is 0800 654 655, with a text line at 8006, and Safer Gambling Aotearoa is the public-facing service. TAB NZ pays a Problem Gambling Levy of 0.74%, in force from 1 July 2025 to 30 June 2028, which funds those services. The TAB NZ app carries a 17+ App Store age rating while stating that customers must be 18 or over to bet; the age for betting is 18 in New Zealand under section 89 of the Racing Industry Act 2020, and betting under 18 is an offence. Land-based casinos are 20, not 18; never merge the two ages.

The age check at TAB NZ is an account-opening requirement. A TAB NZ account needs a verified New Zealand address and ID, and the verification is what triggers the responsible-gambling tools. An offshore brand without a New Zealand address check has no way to apply New Zealand harm-minimisation tools to a New Zealand punter. The calculator on an offshore site is doing the math; the framework around it is not there.

Betcha’s community tools

Betcha’s app lists a Bet Social section where punters chat, follow tipsters and share bets or pools, and a Playbook with tips and match analysis. The Daily Toolbox offers odds boosts and insurance tools for bets that do not land. None of these tools change the math a calculator does, but they shape the punter’s environment — what bets are visible, what bets are boosted, what bets other punters are placing. The Insurance tool is the most calculator-relevant: a bet that does not land is refunded in part as Bonus Cash or as a free bet, and the cost of that refund is built into the price the punter paid. A calculator on a Betcha boosted bet is showing the boosted price; a calculator on the same bet without the boost is showing the un-boosted price; the difference is the cost of the insurance.

What a calculator cannot tell a New Zealand punter

A betting calculator is arithmetic. It takes numbers in and returns numbers out. It does not know whether the operator is licensed in New Zealand, whether the punter is over 18, whether the bankroll can absorb the next loss in a Labouchere sequence, whether the bonus offer applies to the market the punter wants to bet on, whether the offshore operator will pay out a large win, whether the dividend on a forecast bet is settled the way the calculator expects, or whether the bet the calculator has just priced is compliant with local rules. The arithmetic is correct. The cost is not arithmetic only.

The punter who uses a calculator on a TAB NZ bet is paying for arithmetic on a bet that has a New Zealand licence, a New Zealand regulator, a New Zealand harm-minimisation framework, a New Zealand complaints route, and a self-exclusion that applies across both brands. The punter who uses the same calculator on an offshore bet is paying for arithmetic on a bet that has none of those, and the price the calculator returns is the same number. The cost the punter pays for ignoring the difference is the difference. The calculator cannot see it. The punter has to.

Operator write-ups

TAB — the monopoly calculator

TAB is one of two online brands of TAB New Zealand, the sole provider lawfully offering racing and sports betting to people in New Zealand since 28 June 2025 (Racing Industry Act 2020, section 74AAA). The TAB NZ app covers horse and harness racing, rugby union, rugby league and other sports, pre-match and live, with Trackside live race streaming, racing form, Blackbook and Jockey Challenge tools, and a simplified wallet for deposits and withdrawals. The calculator the punter needs — stake, price, multi, each-way, forecast — is built into the app and works in the odds format the app publishes.

The calculator’s job at TAB is the standard one: stake times price, multi-leg multiplication, each-way settlement. What the TAB calculator adds is the New Zealand-specific bet types — Quinella, Exacta, Trifecta, First Four, Double, Treble, Daily Double, Running Double, Quaddie, Big6 — and the racing dividends settled after the race. The Place Extra option lets punters back runners to finish up to tenth in selected races, and the Same Race and Same Game Multis multiply across legs the calculator treats as one slip. Bonus Cash splits across multiple bets and the Mega Multi back-up bonus of up to $50 in Bonus Cash applies when a multi of four or more legs falls short by a set number of legs, terms and conditions apply. The terms are the cost the punter pays for the bonus, and the calculator shows what the Bonus Cash is worth at the price the punter has chosen.

The cost the punter is not paying: offshore withdrawal risk, an unlicensed operator’s refusal to pay a large win, a regulator’s warning that an operator may not return unspent credits. TAB NZ’s terms, the regulator’s oversight and the New Zealand complaints route are part of the price the calculator does not show. The punter pays for them anyway, by placing the bet with TAB rather than with an offshore brand that has been told to withdraw from the market. That is what the licence is worth, and the calculator on TAB is doing the math on a bet the regulator recognises.

Verdict. The TAB calculator is the one that returns a number the punter can act on without checking the operator’s licence first. The math is the same math; the framework around it is the New Zealand one, and the punter who uses it gets the same answer as the punter who uses an offshore calculator — at the cost of using an operator outside the New Zealand complaints route.

Betcha — the same math, a different app

Betcha is the second online brand of TAB New Zealand, run under the same Entain partnership, and the calculator inside it does the same arithmetic on the same bet types. What Betcha adds on top of the math is a different surface: a Daily Toolbox with odds boosts and insurance tools, a Bet Social section where punters chat, follow tipsters and share bets or pools, and a Playbook with tips and match analysis. The boosted prices are the prices the calculator uses; the insurance tools refund part of the stake as Bonus Cash on bets that do not land, and the cost of that refund is built into the boosted price the punter paid.

The calculator’s job on a boosted bet is to show both the boosted price and the un-boosted price, side by side. The difference between them is the cost of the insurance — what the punter paid for the chance of a refund on a losing bet. A boosted $2.10 that came from an un-boosted $1.95 is a boosted price that costs the punter 15 cents of margin per $1 of stake, and the calculator showing both numbers is showing the trade. The punter who wants the insurance pays the 15 cents; the punter who does not looks for the un-boosted price elsewhere, knowing that elsewhere is at an operator the regulator has told to stop taking New Zealand bets.

Verdict. Betcha’s calculator is the TAB calculator with a social surface and an insurance layer. The math is unchanged. The trade-off is between a boosted price with insurance and an un-boosted price without, and the calculator’s job is to show both. The punter who values the social surface and the insurance picks Betcha; the punter who values the un-boosted price picks TAB, knowing that TAB and Betcha are the same operator group and the same licence covers both.

Sportaza — the Bet Builder and the void rule

Sportaza is not licensed in New Zealand; only TAB NZ may offer racing and sports betting to New Zealanders under section 74AAA, and the brand’s Anjouan licence (ALSI-202606064-FI2) is invalid here. The Sportaza calculator handles cash out, Bet Builder, multiples, Asian lines and interval markets in 1, 5, 10 or 15 minute ranges. The Bet Builder voids the entire betslip if any one selection is void — a rule the calculator shows by letting the punter tick “void leg: whole slip” rather than re-multiplying on the remaining legs.

The cost of the void rule. A four-leg same-game multi at Sportaza: one leg voids and the entire betslip is void, returning the stake. A four-leg same-game multi at an operator that re-multiplies on a void leg returns the combined price of the remaining three. The calculator on Sportaza shows the first outcome; the calculator on the second operator shows the second. A punter choosing between the two is choosing between a bet that voids on a single leg and a bet that survives — and the price on Sportaza is the price the punter pays for the rule. The math is mechanical. The rule is the cost.

Sportaza operates without local authorisation and provides no consumer safeguards here. The Bet Builder is doing the math. A punter who uses the Sportaza calculator is paying for arithmetic on a bet outside the local regulatory framework.

Verdict. The Sportaza calculator is feature-rich but operates outside the New Zealand framework. The Bet Builder’s void rule is the cost the calculator surfaces — a bet that voids on a single leg is a bet the punter pays for not with the headline price but with the rule. The punter who values the feature pays the rule and pays the offshore risk; the punter who values the New Zealand framework knows the true cost of the bet.

RTbet — the cash-out lock

RTbet provides no local consumer safeguards and operates without authorisation in New Zealand. The RTbet calculator handles cash out before an event or market is finalised, fixes the cash-out amount at the moment it is accepted and does not guarantee the feature is always available.

The cost of the cash-out lock. A punter at RTbet who accepts a cash-out offer has the amount fixed at the moment of acceptance; a later price move does not change what the punter locked in. The calculator’s job is to show the locked amount against the value of holding the bet to settlement — the expected return at the original price times the probability the punter assigns to the bet winning. The cost is the difference between the locked amount and the expected value of holding, and the punter who accepts the cash-out is paying that difference for certainty. The calculator shows the trade. The punter decides.

The cost the punter ignores: the licence check. RTbet is not authorised in this market and offers no local consumer protections. The cash-out feature is doing its math, and the punter who uses the RTbet calculator pays for arithmetic on a bet outside the regulatory framework.

Verdict. The RTbet calculator’s cash-out lock is the cost the calculator surfaces — a fixed amount against an expected holding value, with the difference paid for certainty. The math is the same math; the framework around it is not the New Zealand one.

BetNinja — the licence from the Union of the Comoros

BetNinja is not licensed in New Zealand. The BetNinja calculator’s job is the standard one: stake, price, multi, system. The licence from the Union of the Comoros is not a New Zealand licence and does not provide access to the local dispute resolution process. The calculator returns the same numbers a TAB calculator returns at the same stake and price. The framework around those numbers is different.

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. Comoros is one such jurisdiction. The BetNinja calculator provides arithmetic, but the punter relies on pricing for an unregulated market.

Verdict. The BetNinja calculator does its arithmetic. The licence pays for nothing in New Zealand. The punter who uses it pays for pricing in a market that lacks local regulatory backing. The cost of a bet at an unlicensed operator is the lack of a complaints route.

Alawin — the cash-out and the free bet rule

Alawin is not authorised in this market and offers no local consumer protections. The Alawin calculator handles full and partial cash out, with the rule that cash out is not available on free bets or risk-free bets. The punter who places a free bet at Alawin cannot lock in a partial return through cash out; the punter who places a cash bet can.

The cost of the rule. A free bet at Alawin is a bet the punter cannot cash out. A cash bet at Alawin is a bet the punter can. The calculator’s job is to show the difference — the cash bet’s locked cash-out value versus the free bet’s held-to-settlement expected value — and to show what the rule costs the punter who chose the free bet. The math is the same math; the rule is the cost.

The cost the punter ignores: the licence check. The cash-out feature performs its own calculations. The punter who uses the Alawin calculator relies on pricing for a market outside the regulatory framework.

Verdict. The Alawin calculator surfaces the free-bet cash-out rule — a free bet the punter cannot lock in, a cash bet the punter can. The rule is the cost the calculator shows; the licence the calculator cannot show is the cost the punter is not paying attention to.

Winz.io — the Anjouan and Tobique licence

Winz.io is not licensed in New Zealand. The Winz.io calculator’s job is the standard arithmetic. The licences it sits behind are licences that do not apply in New Zealand. The calculator returns the same numbers a TAB calculator returns at the same stake and price; the framework around those numbers is different.

Anjouan and Tobique are jurisdictions the Department of Internal Affairs monitors. The Winz.io calculator performs its calculations, but the punter relies on pricing for an unregulated market.

Verdict. The Winz.io calculator does its arithmetic. The Anjouan and Tobique licences pay for nothing in New Zealand. The same math at TAB NZ returns the same numbers at a cost the regulator does recognise.

Rooster.bet — the Tobique licence

Rooster.bet is not licensed in New Zealand. The Rooster.bet sportsbook has Live, Sports Promotions, Results, Schedule, E-sports and Predictions sections, shows odds in six formats, and the calculator handles stake, price, multi, system. The Tobique licence is not a New Zealand licence and does not provide access to the local dispute resolution process.

The Department of Internal Affairs has warned operators serving New Zealand to withdraw. The Rooster.bet calculator handles calculations for an unlicensed operator, and the punter using it relies on pricing for an unregulated market.

Verdict. The Rooster.bet calculator does its arithmetic. The Tobique licence pays for nothing in New Zealand. The same math at TAB NZ returns the same numbers at a cost the regulator does recognise.

Rabona — the Soft2Bet sportsbook

Rabona is not licensed in New Zealand. Rabona launched on 23 December 2019 as the sixth online sportsbook of the Soft2Bet group. The calculator handles stake, price, multi, system. The Curaçao licence is not a New Zealand licence and does not give Rabona a route into the New Zealand complaints or harm-minimisation framework.

The cost the punter ignores: the licence check. Curaçao is one such jurisdiction. The Rabona calculator handles calculations for an unlicensed operator, and the punter using it relies on pricing for a market outside the regulatory framework.

Verdict. The Rabona calculator does its arithmetic. The Curaçao licence pays for nothing in New Zealand. The punter who uses it pays for a market that lacks local regulatory backing.

BetAlright — the partners site and the eighteen-plus rule

BetAlright is not licensed in New Zealand — only TAB NZ may offer racing and sports betting to people in New Zealand under section 74AAA, and the brand names no licence that applies in New Zealand. BetAlright accepts customers over 18 years of age only and has a separate partners site. The calculator’s job is the standard arithmetic; the over-18 rule is the same rule that applies at TAB NZ, with a different enforcement mechanism. TAB NZ verifies a New Zealand address and ID; BetAlright verifies the age without the New Zealand framework behind it. The cost the punter is not paying: the New Zealand harm-minimisation framework — deposit limits, time-outs, self-exclusion across brands, the Gambling Helpline, Safer Gambling Aotearoa. The BetAlright calculator does not surface those tools because those tools are not there.

The cost the punter is paying: the offshore risk. BetAlright is such an operator; the regulator has told operators serving New Zealand to withdraw with immediate effect. The BetAlright calculator is doing its math on a bet the regulator has told the operator to stop taking, and the punter who uses it is paying for arithmetic on a bet the regulator does not recognise.

Verdict. The BetAlright calculator does its arithmetic on a bet outside the New Zealand framework. The same math at TAB NZ returns the same numbers at a cost the regulator does recognise. The punter who values the New Zealand framework picks TAB NZ; the punter who does not pick BetAlright and pays for arithmetic the regulator does not recognise.

A punter’s reading of the calculator

A punter who opens a betting calculator in 2026 is doing one of three jobs: pricing a single bet, sizing a multi, or working out what a bonus offer is worth after the terms. The arithmetic on all three is the same arithmetic. The cost on all three is not. The punter who prices a single bet at TAB NZ pays for arithmetic on a bet with a New Zealand licence; the punter who prices the same single at an offshore brand pays the same arithmetic on a bet the regulator has told the operator to stop taking. The punter who sizes a multi at either operator pays the margin on every leg; the multi’s combined price is the less-thanked expression of a margin the punter paid leg by leg. The punter who works out a bonus offer pays the headline, the rollover, the expiry and the markets — and at an offshore brand, the cost of an offer from an operator the regulator does not recognise.

The calculator’s true value is the comparison the punter might overlook: the same stake at the same price returning the same number at two different operators, with one of them sitting inside the New Zealand framework and the other sitting outside. The arithmetic is identical. The cost is not. The punter who uses the calculator and ignores the operator’s status pays for arithmetic on a bet the regulator does not recognise; the punter who uses the calculator and checks the operator pays for arithmetic on a bet the regulator supports.

Frequently asked questions

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

TAB NZ is the only provider lawfully offering racing and sports betting to people in New Zealand. Its two online brands are TAB and Betcha. Section 74AAA of the Racing Industry Act 2020, in force since 28 June 2025, prohibits any other person from offering such bets to a person in New Zealand, 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?

For a single bet, return is stake multiplied by the decimal odds. For a multi, each leg’s odds multiply into one combined price, which is then multiplied by the stake. A bonus or free bet whose stake is not paid back returns the bonus multiplied by (odds − 1) divided by odds, multiplied by the market’s payout share.

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

The margin is the cut the bookmaker keeps of every unit bet on a market. It shows up as the gap between the implied probabilities of all outcomes and 100%. A two-way market at 1.90 / 1.90 has a payout share of about 95% and a margin of about 5%; the margin widens on markets with thinner liquidity and on multi-leg bets, where each leg’s margin compounds.

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

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. There is no New Zealand complaints route, no New Zealand harm-minimisation framework and no cross-brand self-exclusion at an unlicensed operator. The law targets the operator; the player bears the offshore risk.

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

Betting with TAB NZ requires the customer to be 18 or over; betting under 18 is an offence under section 89 of the Racing Industry Act 2020. A TAB NZ account opening requires a verified New Zealand address and ID. Land-based casinos in New Zealand are 20, not 18 — the two ages are not the same.

Are betting winnings taxed in New Zealand?

Inland Revenue guidance says recreational gambling winnings are generally not taxable, and prize money from TAB horse, dog and trotting races is not taxable. A person who bets as a business is a different case. Operator side: TAB NZ pays the Problem Gambling Levy of 0.74%, and overseas operators supplying New Zealand residents pay online gambling duty, but duty payment does not make an offer lawful.

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