How to Count Cards in Blackjack

Card counting is one of the most talked about strategies in casino gambling, and it has been glamorised a lot by Hollywood. It’s feared by pit bosses, and it is misunderstood by pretty much just about everybody else!

Now, the reality of card counting is a lot less sexy than Rain Man suggests, but the core idea is generally the same. On this page, I’m going to give you a straightforward breakdown of exactly how it works, what you actually need to do to card count successfully, and why most people can never pull it off.

What Card Counting Actually Is

Counting operates isn’t about memorising every card that’s been played – contrary to popular belief! Instead, it’s about tracking the ratio of high cards to low cards that are left in the deck. When there are more tens and aces left in the shoe, the deck is called “rich”, and that’s good for the player, and bad for the casino. When the deck is filled with small cards, the house edge increases.

Now, before you practise card counting at the tables, it’s worth getting comfortable with the game of blackjack itself. If you want to brush up on your basic strategy and get a feel for different variants of the game, go ahead and get your welcome bonus at this NZ online casino to play without pressure first. Understanding the ins and outs of blackjack is the first step.

The Hi-Lo System: The Best Starting Point for Beginners

The most widely taught counting method is the Hi-Lo system, and it’s the best place to start in my opinion. In this system, every card in the deck is assigned a value:

• Cards 2-6: +1 (low cards, good for the dealer – count goes up when they leave)
• Cards 7-9: 0 (neutral, ignore them)
• Cards 10, J, Q, K, Ace: -1 (high cards, good for the player – count goes down when they leave)

As cards are dealt, you mentally add or subtract from a running total, and a high positive count means the deck is rich in tens and aces – which is good for you – while a negative count simply means the opposite, which is bad for you.

Running Count vs True Count

The running count alone isn’t enough when multiple decks are in play, and that’s now the standard in most land-based casinos. To combat this, you need to convert to a true count by diving the running count by the estimated number of decks remaining in the shoe.

For example, if your running count is +10 and there are roughly 2 decks left, your true count is +5, and this is the number that actually guides your betting decisions.

How to Bet Based on the Count

This is where card counting start to actually give you an edge, because when the true count is positive – let’s say +2 or higher – you increase your bet, while, when it’s neutral or negative, you bet the minimum. The principle is simple: bet big when the deck favours you, bet small when it doesn’t.

Below, you can see a rough guide for bet sizing based on true count:

• True count 0 or below: Minimum bet
• True count +1: 1–2x minimum
• True count +2: 2–4x minimum
• True count +3 or higher: 4–8x minimum (or table maximum)

The Skills You Actually Need

Card counting requires you to be able to do three things at the same time. You need to be able to count accurately, maintain both the running and true counts, and play a perfect strategy at the same time.

You also need to be able to look natural, because land-based casinos are private businesses – and this means they can, theoretically, ask anyone to leave, at any time. While card counting isn’t illegal, it is banned in every casino – so if they suspect that you’re counting cards, they will more than likely ask you to leave.

The Bottom Line

Card counting is legal, but it’s demanding, and it’s definitely not something you can just pick up and learn in a day. It takes weeks, months, or, sometimes, even years of practice before everything becomes second nature to you – and you need to also remember that the mathematical advantage, while not insignificant, is pretty small – so don’t expect to see big wins in short spans of time.

Another thing to keep in mind is that card counting cannot be done online. It only works in land-based casinos, and that’s because in an online blackjack, the decks of cards are shuffled after every hand. Even live dealer casinos are designed to prevent card counting. If you do want to try it for yourself, you’ll need to head to a land-based casino offering blackjack.

Last updated: 9/06/2026