Skip to main content Skip to footer

A Comprehensive Guide to Blackjack Betting Systems

None of them actually guarantees wins but they can take your gameplay to the next level.

Blackjack, also known as 21, is a popular casino game worldwide. When I first played it, I was captivated by the thrill of strategizing against the dealer and the chance to hit the perfect 21.

To improve the chances of winning, many players explore various betting techniques. Even the most effective betting system cannot overcome the house edge without mastering basic blackjack strategy (hitting, standing, doubling down, splitting). 

Here, I outlined some of the best and most popular blackjack betting systems and provided a detailed analysis of each.

Popular Blackjack Betting Systems

The Martingale System

Profitability: Low to Moderate

Perhaps, the most well-known betting method for blackjack and other casino games is the Martingale System. The idea is straightforward- with each defeat, you double your wager. 

The concept is that if and when you win, you will have earned a profit equivalent to your initial wager and have recovered all of your previous losses. But, the Martingale system also has a high risk of quickly exhausting your funds with a losing streak.

Here’s how It works:

  • Start with a Base Bet: Decide on your initial bet. Let's say it's $10.
  • Double After a Loss: If you lose the first hand, double your next bet to $20.
  • Continue Doubling: Keep doubling your bet after each loss: $40, $80, $160, etc.
  • Reset After a Win: When you win, go back to your base bet of $10.

The Paroli System

Profitability: Moderate to High

The Paroli System or the Reverse Martingale, employs the opposite strategy. You double your wager after a win rather than doubling it after a loss. The goal is to reduce losses during losing streaks and maximize gains.

To Use this system, follow this guide: 

  • Start with a Base Bet: Again, let's use $10 as the example.
  • Double After a Win: If you win the first hand, double your next bet to $20.
  • Cap Your Wins: Decide on a limit for consecutive wins (usually three wins), then reset to your base bet.

The Fibonacci System

Profitability: Low to Moderate

Inspired by the famous Fibonacci sequence, this system is less aggressive than the Martingale but still offers a structured way to manage your bets. The sequence is 1, 1, 2, 3, 5, 8, 13, etc., where each number is the sum of the two preceding ones.

How It Works:

  • Start with a Base Bet: $10, for instance.
  • Follow the Sequence After a Loss: Move to the next number in the sequence after each loss.
  • Reset After a Win: Move back two numbers in the sequence after a win.

The D'Alembert System

Profitability: Low to Moderate

The D'Alembert System is also a negative progression system, however, it's less aggressive than the Martingale. You increase your bet by one unit after a loss instead of doubling it. Follow these: 

  • Start with a Base Bet: Again, $10 for example.
  • Increase After a Loss: Add one unit to your bet after a loss ($10, $20, $30, etc.).
  • Decrease After a Win: Subtract one unit from your bet after a win.

The Labouchere System

Profitability: Moderate

The Labouchere System or the Cancellation System, is a little more intricate but provides you with greater options in terms of bet management. Your stake is the sum of the first and last numbers in the sequence that you start by writing down. Check these:

  • Create a Sequence: Write down a sequence, such as 1, 2, 3, 4, 5.
  • Bet the Sum: Your first bet is the sum of the first and last numbers ($6 in this case).
  • Adjust the Sequence: If you win, cross off the first and last numbers. If you lose, add the bet amount to the end of the sequence.

The Oscar's Grind System

Profitability: Moderate

Oscar's Grind, also known simply as The Grind, is a positive progression system that aims to make a profit while minimizing risk. The goal is to win one unit per betting cycle.

How It Works:

  • Start with a Base Bet: For example, $10.
  • Increase After a Win: Increase your bet by one unit after each win.
  • Stay the Same After a Loss: Keep your bet the same after a loss.
  • Reset After a Cycle: Once you've achieved a profit of one unit, reset to your base bet.

The 1-3-2-6 Betting System

Profitability: Moderate

The 1-3-2-6 System is a positive progression system that's easy to follow and aims to capitalize on short winning streaks. The numbers represent the betting units you wager in a sequence of four bets.

How It Works:

  • Bet One Unit: Start with one unit ($10).
  • Bet Three Units: If you win, increase to three units ($30).
  • Bet Two Units: If you win again, decrease to two units ($20).
  • Bet Six Units: If you win again, increase to six units ($60), then reset.

The Kelly Criterion

Profitability: High

An even more sophisticated method, the Kelly Criterion, calculates the ideal wager size depending on your funds and perceived advantage over the opponent using mathematical calculations. Although it has uses in blackjack betting, this approach is more typically utilized in investing. Here's how:

  • Calculate Your Edge: Determine your edge over the game (e.g., through card counting).
  • Use the Formula: Bet Size = (Edge / Odds) * Bankroll.

Knock Out Card Counting System

Profitability: High

The Knock Out (KO) card counting system is a simplified approach to card counting designed to make the process easier and more accessible, especially for beginners. Unlike traditional systems like Hi-Lo which require converting the running count to a true count based on the number of decks remaining, the KO system operates on a straightforward running count.

The assigned values to the cards are:

  • 2 to 7: +1
  • 8 and 9: 0
  • 10, J, Q, K, A: -1

You maintain a running count based on these values when cards are dealt. Since there are more high-value cards (10s and Aces) remaining in the deck, the theory goes that the greater the count, the better it is for the player.

Here's how to use this system:

  1. Start Counting: Begin your count at 0 at the start of the shoe.
  2. Adjust Your Bet: Increase your bet as the count goes higher, indicating a favorable deck. Conversely, decrease your bet or bet to the minimum when the count is low or negative.
  3. Make Strategic Decisions: Use the count to inform your playing decisions, such as standing, hitting, or doubling down.

 Here's a table that summarizes the Pros and Cons of each Betting system:

Betting System



The Martingale System

Simple, Guaranteed profit after win

Requires large bankroll, Table limits can restrict doubling

The Paroli System

Limits bad streak losses, Potentially large wins

Winning streaks rare, Requires discipline

The Fibonacci System

Less aggressive than Martingale, Manages losses better

Significant losses in prolonged losing streaks, More complex

The D'Alembert System

Less aggressive than Martingale, Easier to manage with limited bankroll

Still leads to losses, Requires patience and discipline

The Labouchere System

Flexible, Tailorable to bankroll

Complex, Can lead to significant losses

Oscar's Grind System

Slow, steady gains, Minimizes losing streak risk

Slow progression can be frustrating, Requires patience and discipline

The 1-3-2-6 System

Simple, Limits losing streak losses

Relies on short winning streaks, Moderate losses if streak broken

The Kelly Criterion

Maximizes long-term growth, Adjusts bet size strategically

Requires precise edge calculation, Complex and difficult to implement

KO Card Counting

Simplified counting, Solid advantage, Beginner-friendly

Less accurate than complex systems, Detection risk from casinos

Tips for Winning Mindset

Fund Management

No betting system will help if you don't manage your money well. Setting and sticking to a budget is needed if you want to stay afloat. 

  • Establish a predetermined amount you are willing to lose and stick to it.
  • Adjust your bet sizes based on your wallet to survive losing streaks.
  • Assess your victories and defeats to measure your progress over time.

Recognizing House Edge

Every betting technique works on the idea that you are aware of the house advantage. The house edge in blackjack varies depending on your skill level and the game's rules. While techniques like card counting and basic strategy may reduce the house edge, it's important to understand how much of an advantage or disadvantage you're up against.

Psychological Elements

Betting methods impact your mental health. The pressure of winning back losses with the Martingale or the frustration of slow progression with Oscar's Grind influences your decision-making. Maintain your composure and practice discipline. 

Combining Systems

Some players find success by combining elements from different systems. For example, you might use the Martingale during a hot streak and switch to the D'Alembert during a cold streak. Experimenting with different combinations can help you find a strategy that works best for you.


Probabilities of Blackjack

Unlike roulette where the outcome is determined by a single spin, blackjack is a game where you make several decisions. Learning the probabilities of this game can be a powerful tool. One important probability to consider is the dealer's bust probability.

This refers to the likelihood of the dealer exceeding 21 after receiving their cards. Certain exposed dealer cards, like a 5 or a 6, inherently carry a higher bust probability.

Dealer Bust Probability Based on Up Card

A more advanced technique that tackles deep into probability is card counting. By keeping track of the cards that have already been played, counters determine how many cards are left in the deck and, consequently, the probability of obtaining a blackjack.

Learning this can adjust your betting approach. Remember that the likelihood of getting a blackjack with two random cards is 4.8%, regardless of card counting. Situations where this probability might be slightly higher or lower are indicated by card counting. However, card-counting strategies may be discouraged or even prohibited by casinos. 

To provide a more comprehensive picture of hand probabilities, here is the table showing the probability of getting various hand totals with two random cards:

Probability of Getting Various Hand Totals with Two Random Cards


So, What is the Most Profitable Blackjack Betting System?

Profitability varies depending on several criteria, such as funds, risk tolerance, discipline, and particular game conditions, but under some circumstances, certain systems perform better than others. 

No betting system can guarantee consistent wins against the house edge in blackjack. Although the Kelly Criterion when used with card counting can be considered the most profitable strategy, it does, however, demand a great deal of skills and dedication. The Paroli System or Oscar's Grind may be more sensible options for the majority of casual players and yet provide good profits at a lesser risk. 

With a more upfront method, the KO card counting technique also offers significant profit potential. Finally, the "most profitable" system is the one that best aligns with your skills, goals, and ability to manage risk. If you want to practice your skills at blackjack, always do it with responsible gambling sites. Shuffle up and deal!

About the author

Angel Cabal

Ex-soccer player for Real Oviedo Football Club and long-time casino enthusiast with a profound understanding of the iGaming industry. I'm constantly on the lookout for the latest bonuses, leveraging my 10+ years of expertise to maximize your gambling returns.