You can do matched betting in Australia without paying for software, and the reason is simple: the hard part was never the arithmetic. Working out a lay stake is one division. A browser calculator does it in a second, an exchange account costs nothing to open, and the terms page attached to an offer is free to read. Nothing on that list carries a subscription.
What paid tools sell is the search: which of the accounts you hold is running something this week, which market pairs cleanly against the exchange, and what you did last Tuesday when a settlement needs checking. That is time and coverage, which are real things to buy and different things from capability.
What is genuinely free, and enough to start
Three things, and none of them has a price.
A back and lay calculator. Two modes cover almost everything: a cash qualifier where the stake comes back, and a stake-not-returned bonus bet where it does not. The bonus bet converter works in your browser, needs no account and costs nothing, and four more sit free at the calculators on the odds comparison page.
An exchange account. Opening one costs nothing. Commission is charged on net winnings in a market you win and nothing at all on a market you lose, which is why it belongs in the sum rather than in a monthly fee. In Australia this generally means Betfair; matched betting without Betfair covers the alternatives.
The offer's own terms page. The document people skip, and the one that decides what an offer is worth. Minimum odds, which markets qualify, whether the bonus is stake-not-returned, how long it lasts, whether the refund arrives as cash or as another bonus: each changes the number the calculator produces, and none is guessable from the headline.
The arithmetic a calculator does in one line
For a stake-not-returned bonus bet, where the bookmaker keeps the stake and pays only the profit:
- lay stake = bonus bet x (back odds - 1) / (lay odds - commission rate)
- liability = lay stake x (lay odds - 1)
- cash kept either way = lay stake x (1 - commission rate)
- conversion = cash kept / bonus bet
For a cash bet, where the stake comes back if it wins, the only change is the numerator:
- lay stake = back stake x back odds / (lay odds - commission rate)
That is the entire engine inside every matched betting tool, free or paid. Commission is entered as a rate, so 5% is 0.05, and it sits in the denominator because the exchange only takes it when the lay wins.
A worked bonus bet, by hand
Illustrative prices, picked to show the arithmetic rather than to describe a live market: a $60 bonus bet, a bookmaker price of $3.00, an exchange lay price of $3.05 and 5% commission.
- lay stake = 60 x (3.00 - 1) / (3.05 - 0.05) = 120 / 3.00 = $40.00
- liability = 40.00 x (3.05 - 1) = 40.00 x 2.05 = $82.00
- cash kept either way = 40.00 x (1 - 0.05) = $38.00
- conversion = 38.00 / 60.00 = 63.3%
Check both outcomes, because that is the only proof the sum is right.
| If the selection | Bookmaker side | Exchange side | Net |
|---|---|---|---|
| Wins | 60 x (3.00 - 1) = $120.00 | liability paid, minus $82.00 | $38.00 |
| Loses | nothing, the bonus is spent | 40.00 x 0.95 = $38.00 | $38.00 |
Both rows land on $38.00, which is what "either way" means. Two numbers there deserve a second look: the conversion is 63.3%, nowhere near the face value of the bonus, and the liability is $82.00 against a $60.00 bonus, so the money you have to find is larger than the money you are converting.
Risk: Betting involves risk. Bookmakers can restrict or close accounts and void bets, automation can fail, prices move, and a positive expected value bet can still lose. Promotions carry each bookmaker's own terms and a bonus bet that loses pays nothing. There is no guarantee of profit. See responsible gambling for limits and support.
The arithmetic also assumes both bets are matched in full at the prices entered. If the lay part-fills, or the exchange price moves while you are typing, the real result sits either side of $38.00.
The qualifying loss, when an offer needs one
Plenty of offers want turnover first. That qualifying bet is a cash bet, so it uses the second formula, and it normally costs a little rather than nothing. Illustrative again: a $50 qualifier at $2.50, laid at $2.55, commission 5%.
- lay stake = 50 x 2.50 / (2.55 - 0.05) = 125 / 2.50 = $50.00
- liability = 50.00 x (2.55 - 1) = $77.50
If it wins, the bookmaker returns 50 x 2.50 = $125.00, a $75.00 profit, and the lay loses $77.50, so the net is minus $2.50. If it loses, you are minus $50.00 at the bookmaker and the lay wins 50.00 x 0.95 = $47.50, so the net is again minus $2.50. The qualifier costs $2.50 whichever way it lands, which is 5% of the stake.
Put the halves together and the honest figure for the whole exercise is $38.00 minus $2.50 = $35.50 kept, against a $60.00 bonus and a $50.00 turnover requirement. The second figure is the one worth quoting, because the first quietly ignores the entry fee.
Tip: the qualifying loss shrinks as the two prices converge, so a market where the bookmaker price and the exchange price sit close together is a cheaper qualifier than a long-priced one. Promo turnover requirements covers what a bookmaker can ask for before an offer unlocks.
What the free route costs instead of money
Nothing on the list above has a price, so the bill arrives as your own labour. Price that honestly before deciding the paid side is pointless, because it is the whole of what the paid side is for.
You do the search. Nothing tells you which of the accounts you hold is carrying an offer this week, or which market on it is priced close enough to the exchange to be worth the qualifier. That is an account-by-account look through every promotions page and every message you have consented to receive, repeated each time, and it is the part that costs an evening rather than a minute.
You keep the record. One bet is two legs, at two operators, settling at two different times, and nothing reconciles them for you. A matched betting spreadsheet sets out the columns that make a record add up.
You carry the price risk by hand. A calculator is exact on the numbers typed into it and knows nothing about whether either price still exists, so the gap between working the stake out and getting the lay matched is yours either way.
What no tool sells, free or paid, is better arithmetic. The lay stake formula is public, the division is the same for everyone, and a paid calculator returns $40.00 on the numbers above exactly like a free one. What the categories of paid tool do differ on, and the questions to ask before paying for one, are in matched betting software in Australia.
The costs that have nothing to do with software
The cost of this method is mostly not a subscription, which is the point missed when a free tool is compared with a paid one.
| Cost | Where it lands | Size in the example above |
|---|---|---|
| Exchange liability | Idle cash in the exchange account | $82.00 on a $60.00 bonus |
| Commission | Deducted from net winnings in a market you win | $2.00 of the $40.00 lay |
| Qualifying loss | Paid once per qualifying bet | $2.50 on a $50.00 qualifier |
| Your time | Finding the offer, pricing it, recording it | The thing paid tools charge for |
The liability is the one that surprises people, and it is the clearest proof that the cost here is not a subscription. Work the crossover out and it sits at about $2.60: at 5% commission, with the two prices level, the liability passes the bonus's own face value there and keeps growing after it. The same $60 bonus laid at $11.00 needs a lay stake of 60 x 10 / 10.95 = $54.79 and a liability of 54.79 x 10 = $547.95. That money is not lost, and it comes back when the lay loses, but it has to be sitting there, idle, before the lay can be matched. What to do about that trade is the beginner's question rather than the cost question, and matched betting for beginners works it across three price bands.
Commission rewards a bit of reading too, because it applies to net market winnings rather than to turnover. Exchange commission explained sets out how the deduction works.
The ceiling no tool lifts
No tool makes a bookmaker send you offers. Promotions are issued by bookmakers under their own terms, the bookmaker decides whether a bet qualifies, and nothing in software can create, unlock or claim an offer that is not on the account. When the offers stop arriving, better software does not restart them.
Bookmaker terms govern what is allowed, and no software prevents an account being restricted or closed. Accounts must be in your own name, and automation must never be used to get around a limit, an account closure or a self-exclusion.
Where B337 is free, and where it is not
Free, with no account and no payment details: the bonus bet converter, which works out the lay stake, the liability and the cash you would keep either way after commission, in your browser. It assumes both bets are matched in full at the prices entered. Four more calculators cost nothing at the odds comparison page: a lay calculator with a bonus bet mode, a racing promo calculator, an arbitrage calculator and a dutching calculator.
A free B337 account also costs nothing, needs no payment details and is 18+ only. It opens a limited view of the Terminal with live odds, plus live counts from the sports screeners with the rows locked.
What the free tier does not include, stated plainly: no exchange back and lay prices beside the bookmaker columns, no closing lines, no expected value overlays, no screener rows and no automation. Those sit on paid plans, and a plan price is not the whole cost of one either, because bets placed through B337 use credits, a per-bet usage charge on top of it. So the free side covers the arithmetic and a look at the board, and the paid side is the search time and the coverage, which is the split this whole page describes.
Risk: Betting involves risk. Bookmakers can restrict or close accounts and void bets, prices move, and a bet priced above fair can still lose. There is no guarantee of profit. See responsible gambling for limits and support. For free and confidential support call 1800 858 858 or visit gamblinghelponline.org.au.
For the method rather than its cost, start at matched betting in Australia; how to value a betting promotion covers the offers that are not bonus bets at all.