Quick answer: No betting system changes the house edge in blackjack. Martingale (doubling after each loss) wins small amounts often and then loses a big amount at once: with a A$10 start and a A$1,000 table limit, one run of 7 losses costs A$1,270, and over 4 hours there is about a 74% chance of seeing that run. The only thing that lowers your cost is better play and smaller, steadier bets.
A Whirlpool poster once called Martingale "a mathematically proven way to empty your wallet", and the reply underneath simply said "Can vouch for this". We agree, but we would rather show you the numbers than just tell you. The calculators below let you test Martingale against your own table limit, and then see what an hour of blackjack really costs.
Martingale risk calculator
Model: the dealer wins about 53.6% of hands that do not push (typical basic strategy figures). Pushes repeat the same bet. Doubles, splits and blackjack payouts are ignored, so treat the results as close estimates. Free tool from blackjack-unblocked.com, no real money.
What does an hour of blackjack cost?
Long-run averages: any one night can finish far above or below them. House edge figures: Wizard of Odds, The Star and our own calculations, as explained on this page.
Why no system can beat the house edge
- Every hand is a new bet. The cards do not know what you bet last time, so the house edge applies to every dollar you put down.
- Your total cost = total money wagered x house edge. A system only moves money between hands. It cannot change the percentage the house keeps.
- Systems change the shape of your results, not the average. Some give many small wins and rare big losses. Others give many small losses and rare big wins. The average is the same, and it is negative.
So why do systems feel like they work? Because the small wins come first and often. It is the rare losing run that pays for all of them, and it usually arrives later.
Martingale: double after every loss
The idea: bet A$10. Lose, bet A$20. Lose again, bet A$40. When you finally win, you are up A$10 and start again. Here is what a losing run looks like at a A$10 start:
| Loss in a row | Next bet | Total lost so far |
|---|---|---|
| 1 | A$20 | A$10 |
| 2 | A$40 | A$30 |
| 3 | A$80 | A$70 |
| 4 | A$160 | A$150 |
| 5 | A$320 | A$310 |
| 6 | A$640 | A$630 |
| 7 | A$1,280 (over a A$1,000 limit) | A$1,270 |
At that point you cannot double any more. You have won A$10 per series all night, and one run takes back 127 of those wins at once. Seven losses in a row sounds rare. It is not: it happens on about 1.3% of runs, and a 4-hour session gives you plenty of runs.
- Pushes do not reset anything, so the run continues.
- Doubles and splits make it worse: a losing double in the middle of a run doubles the damage.
- Table limits exist partly for this reason. The maximum stops the doubling long before your luck changes.
Other popular systems, briefly
| System | How it works | What really happens |
|---|---|---|
| Reverse Martingale (Paroli) | Double after each win, reset after a loss or a set number of wins | Many small losses, occasional big win. Same average cost |
| D'Alembert | Add one unit after a loss, take one off after a win | Slower than Martingale, but long losing periods still build big bets |
| Fibonacci | Move one step up the 1, 1, 2, 3, 5, 8... sequence after a loss, two back after a win | A gentler Martingale with the same flaw |
| 1-3-2-6 | Bet 1, 3, 2, then 6 units on a winning run | Caps your risk per series, does not change the edge |
| Labouchere | Cross numbers off a list as you win, add them as you lose | Complex, and the list grows quickly in a bad run |
Think a system that bets more when you are winning is safer? It limits how much you lose in a bad run, which is a real benefit for your nerves. It still costs the same on average.
What does lower your cost
- Play correct basic strategy. The difference between perfect play (about 0.6%) and an average player (about 2%) is worth more than any system. A 1994 study at the Adelaide Casino found exactly that gap.
- Pick the right table. A 3:2 table where the dealer stands on soft 17 beats a 6:5 or Blackjack Plus table every time. See our house edge calculator.
- Skip side bets. They carry edges from about 2% to over 20% (see side bets).
- Play fewer hands. A slow, full table costs less per hour than a fast electronic one.
- Card counting is the only legal method that can move the edge in your favour, and in Australia it rarely works (see card counting in Australia).
Bankroll: how big should a bet be?
A player on Whirlpool once asked whether to put A$1,000 of a A$5,000 bankroll on his first hand. The replies were blunt, and right. Here is a simple guide we use:
- Set your session money first, as money you are happy to spend on entertainment, and leave cards at home.
- Keep each bet to about 2% to 3% of the session money. A A$500 session means A$10 to A$15 hands. That gives you room for normal swings.
- Decide your stop in advance, both for losses and for time. Chasing losses is the most expensive system of all.
In my experience the players who enjoy blackjack longest are the ones who treat it as a night out with a price, not a job with a salary. If the price keeps rising, our responsible gambling page has help, or call Gambling Help Online on 1800 858 858.
Rules change from one casino to the next, and sometimes from one table to the next in the same room. Want every casino in one view? See blackjack rules at every Australian casino (one table, with sources). Or use these guides side by side before you choose a table: New to Aussie tables? Start with our Australian blackjack rules guide and keep the strategy chart open while you practise.Compare with other Aussie casinos
Casino guide What stands out Key number Crown Melbourne blackjack Rules Version 29.0: no hole card, double 9-11, Crown Blackjack hits soft 17 Pontoon 0.38% The Star Sydney blackjack Star Blackjack hits soft 17, Blackjack Challenge, NSW carded play Pontoon 0.42% Crown Sydney blackjack Traditional vs Crown Blackjack, partial doubles, no pokies A$20 legal minimum Crown Perth blackjack Soft 17 set by table layout, dealer blackjack takes all, resplit aces Pontoon 0.38% The Star Brisbane and Gold Coast Star Blackjack hits soft 17, 2026 ownership change About 0.8% SkyCity Adelaide blackjack Freebet and 6:5 Party Blackjack, SA's only casino Pontoon 0.64%
Game and tool guides What it covers Key number Blackjack Plus Dealer 22 pushes, instant pays on 21 and five cards 6.36% house edge Pontoon vs blackjack 48-card decks, player 21 always wins, house edge by city 0.34% to 0.64% Side bets in Australia Crown Pairs, Buster Blackjack, Any Pair, insurance 1.9% to 22% Minimum bets in Australia What players report at Crown and The Star, electronic tables Checked Sept 2026 Card counting in Australia What is legal, counting devices, bet limits and bans NSW s87(2) House edge calculator Enter your table's rules and see the cost per hour A$ per hour
Frequently asked questions
Does the Martingale system work in blackjack?
No. It wins small amounts often, but a run of losses eventually hits the table limit or your bankroll. With a A$10 start and a A$1,000 limit, one run of 7 losses costs A$1,270.
Is there any betting system that beats blackjack?
No betting system changes the house edge. Only changing what you know about the remaining cards (card counting) can do that.
How much does blackjack cost per hour?
Bet x hands per hour x house edge. At A$25, 60 hands an hour and 0.57%, it is about A$8.55 an hour on average.
What is a good bankroll for blackjack?
A simple rule: keep each bet to about 2% to 3% of the money you bring for the session.
Is the Reverse Martingale better?
It limits your losses in a bad run, but it does not change your average cost. The house edge still applies to every dollar you bet.
Test a system with no money on the line
Want to see Martingale fail without paying for the lesson? Try it in our free blackjack game, practice points only.