Learning how to count cards in blackjack is the most effective way to improve your chances of beating the casino.
I’m here to help by dissecting the basics of counting cards in blackjack and highlighting the most popular techniques you can use. You’ll still need to practice, but this guide will help you understand how card counting works in blackjack.
What Is Card Counting in Blackjack?
Card counting means tracking the cards left in the dealer’s shoe in real-money blackjack based on the cards you’ve already seen in play. The goal is to figure out what cards are left in the deck, adjusting your strategy and decisions on the blackjack table to make the most from that information.
There are different techniques you can use to count cards. In most of them, low cards contribute to the count, while high cards subtract from it. When the count is high, it favors the player as you are more likely to get blackjack, which offers the highest payout in the base game.
Is It Legal to Count Cards in Blackjack?
Yes, card counting is a legal strategy in blackjack. However, casinos are a business, and like any business, they dislike losing money. Card counting is such an effective strategy that many casinos prohibit it and will eject players if they are caught using this advantage play technique.
That’s why card counting is not only about keeping track of the cards but also preventing the casino from catching you.
How to Count Cards in Blackjack: Popular Techniques
Card counting has existed for decades, and the best gambling minds have crafted multiple strategies for using this technique. The following methods are the most popular.
1. Hi-Lo System
The easiest and most popular blackjack card counting method is the Hi-Lo System. Each card is assigned a number, and you add or subtract from the “count” based on the cards in each hand. You start at zero and do the following for each card:
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- 2-6 = +1 to the count
- 7-9 = +0 to the count
- 10-A = -1 from the count
You divide the running count by the number of decks in the shoe to find the “true” count. For example, if your count is ten and there are four decks in play, the true count is 2.5 (10/4=2.5).
When the true count is high, you have a better chance of getting blackjack or hitting a good card is high, so should increase your stake amount.
By taking advantage of high counts, you minimize the house edge and improve your chance of making a profit.
2. Zen Count
A more advanced variation of the Hi-Lo method is Zen Count. By changing the values of specific numbers, you are able to get a count that more accurately reflects how advantageous the shoe is.
The numbers used in Zen Count are:
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- 2, 3, or 7 = +1 to the count
- 4-6 = +2 to the count
- 8 or 9 = +0 to the count
- Aces = -1 from the count
- 10s and face cards = -2 from the count
As with the Hi-Lo system, you divide your running count by the number of decks to find the true count. When the true count is high, you should increase your stakes.
3. Wong Halves
Another advanced strategy for counting cards is the Wong Halves system. While it is effective, it is also a challenging system to learn.
For Wong Halves, you will use the following count numbers:
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- 2 or 7 = +0.5 to the count
- 3, 4, or 6 = +1.0 to the count
- 5 = +1.5 to the count
- 8 = +0 to the count
- 9 = -0.5 from the count
- 10-A = -1.0 from the count
To simplify this strategy, you can double the point values to eliminate the decimal.
4. Hi-Opt II
If you are playing single-deck blackjack, consider the Hi-Opt II system. It was designed for single-deck games and uses the following count numbers:
-
- 2, 3, 6, or 7 = +1 to the count
- 4 or 5 = +2 to the count
- 8, 9, or Ace = +0 to the count
- 10s or face cars = -2 from the count
More Blackjack Card Counting Tips
Picking the right card counting strategy for your skill set is just part of the equation. Here are three more tips to help you become a successful blackjack card counter.
Tip 1: Practice Card Counting
Regardless of the system you pick, you will need blackjack card counting practice. You can practice on your own as long as you have a deck of cards. Many top casino sites offer free blackjack, too, that you can use to rehearse your counting strategy.
Tip 2: Use Basic Blackjack Strategy
Another tip for using a 21 card counting strategy is to employ basic blackjack strategy. For counting or any advantage play technique to work, you must do everything you can to lower the house edge. This includes using basic strategy to play every hand you are dealt in 21.
Tip 3: Start With Low Stakes
A final tip for learning how to count card in 21 is to start with low stakes. This will minimize your losses if you make any mistakes when you start trying to count at real-money tables.
Also, you need to be able to afford to increase your stakes when the time comes. Betting the table minimum will keep your losses low while you wait for the right time to raise your stakes. Also, it will make it easier to increase your stakes when the count is advantageous.
Can You Count Cards in Online Blackjack?
Card counting is an effective technique for minimizing the house edge, but it cannot be used in digital games. Digital games use random number generators (RNGs), so the cards are unpredictable.
On the bright side, you can use card counting systems, including the Hi-Lo method, in live dealer blackjack games.
BetUS Casino is the best place to use a card counting system in online live dealer blackjack. It offers over a dozen tables, including options for low rollers and high rollers.

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