Card Counting Guide

What Card Counting Actually Is

Every card dealt changes the composition of the remaining shoe. A freshly shuffled 6-deck shoe has 312 cards: 96 high cards (10, J, Q, K, A) and 120 low cards (2-6), with 96 neutral cards (7-9) in between.

As low cards come out, the remaining shoe becomes richer in high cards. High cards favor the player for two reasons: they increase the probability of getting a natural blackjack (which pays 3:2), and they increase the probability that the dealer will bust on stiff hands.

Card counting is just a bookkeeping method. You assign each card a tag value, keep a running tally, and use that tally to estimate whether the remaining shoe favors you or the house. When the count says the shoe is player-favorable, you increase your bet. When it says the opposite, you bet the minimum. Practice tracking the count in the trainer.

Why Counting Works: The Expected Value Math

With perfect basic strategy and no counting, the house edge on a 6-deck S17 game is around 0.26%. That means for every $100 you wager, you lose about 26 cents on average. Counting does not eliminate this edge on every hand. It identifies the hands where the edge has shifted in your favor and tells you to bet more on those.

The math is straightforward. Each true count point shifts the edge by roughly 0.5% toward the player. At a true count of +2 or higher, the player has a positive expected value. The trick is that you spend most of your time at neutral or negative counts, making minimum bets. Your profit comes from the relatively small number of hands played at high counts with big bets. See how count changes affect outcomes in the trainer.

The Hi-Lo System: Step by Step

Hi-Lo is the most widely used counting system. It was popularized by Stanford Wong and is the system most professional counters start with (and many never leave).

Card Values

How to Keep the Running Count

Start at zero after the shuffle. As each card is dealt (to any player or the dealer), add its value to your running total. A 5 comes out: running count goes from 0 to +1. A King comes out: running count drops to 0. A 3 and a 7 come out: only the 3 matters (+1), the 7 is neutral.

Practice at home first. Deal cards face up from a single deck and count through the entire deck. If you end at zero, your count was accurate. Once you can do this in under 30 seconds, you are fast enough for casino conditions. Drill your speed in the trainer.

True Count Conversion

The running count by itself is not enough in a multi-deck game. A running count of +6 means something very different with 1 deck remaining versus 4 decks remaining. The true count normalizes for this.

Estimating decks remaining takes practice. Look at the discard tray and estimate how many decks have been played. Subtract from the total shoe size. If you are playing a 6-deck shoe and the discard tray looks like about 2 decks, there are roughly 4 decks remaining. A running count of +8 divided by 4 gives a true count of +2.

You do not need to be exact. Rounding to the nearest half-deck is close enough. The true count determines your bet size. Most systems use a bet spread: minimum bet at TC 0 or below, increasing at each positive TC level. Practice true count estimation in the trainer.

Common Mistakes