How to Count Cards
Card counting is a skill, not a trick. It gives you a mathematical edge by tracking whether the remaining shoe is favorable to you or to the dealer. This guide covers the Hi-Lo system, the same method used in this trainer.
Why counting works
A blackjack shoe is not random between hands. Cards dealt in previous hands are gone until the shoe is reshuffled. If many low cards (2 through 6) have already been dealt, the remaining shoe is full of high cards. That is good for you: high cards produce more blackjacks, and blackjack pays 3:2. High cards also bust the dealer more often, because the dealer is forced to hit on totals of 16 or less.
Conversely, a shoe full of low cards hurts you. The dealer is less likely to bust, and you are less likely to be dealt a blackjack.
Card counting tracks this imbalance. When the count says the shoe is rich in high cards, you raise your bet. When it says the shoe is low-card heavy, you bet the minimum.
The Hi-Lo values
Every card in the deck is assigned a point value. You add or subtract that value from your running count every time a card is dealt, face-up, to any player or the dealer.
| Cards | Count value | Why |
|---|---|---|
| 2, 3, 4, 5, 6 | +1 | Low cards leaving the shoe is good for you |
| 7, 8, 9 | 0 | Neutral cards, no meaningful effect |
| 10, J, Q, K, A | -1 | High cards leaving the shoe hurts you |
The reason the values are balanced (equal numbers of +1 and -1 cards) is that a fresh shoe starts at exactly 0. After any complete shoe is dealt, the count returns to 0. This means you can detect imbalance simply by watching whether the count drifts positive or negative.
The running count
The running count is a single number you keep in your head. You start at 0 at the beginning of a new shoe and adjust it by the Hi-Lo value of every card you see. You count every visible card: your cards, other players' cards, and the dealer's face-up card. The only card you cannot count is the dealer's hole card, since it is face-down.
Example hand 1: count goes positive
Example hand 2: count goes negative
Example hand 3: mixed hand
The true count
The running count alone is incomplete. A running count of +8 sounds very positive, but if there are 4 decks remaining in the shoe, those extra high cards are spread thin. If there is only 1 deck remaining, +8 is extremely concentrated and very meaningful. The true count corrects for this by dividing the running count by the number of decks remaining.
In this trainer, the true count is always displayed on the right panel. The decks remaining counter appears both in the top bar and in the count panel. You can practice computing the true count yourself before revealing it by using the Show and Hide toggle.
How to bet with the count
The whole point of counting is to bet more when you have an edge. The true count tells you how large that edge is. A simple approach is to use a bet spread: multiply your base bet by a factor tied to the true count.
| True Count | Player edge | Bet size |
|---|---|---|
| -1 or lower | -1% or worse | Minimum bet |
| 0 | -0.5% (house edge) | Minimum bet |
| +1 | 0% (breakeven) | Minimum bet |
| +2 | +0.5% | 2x base bet |
| +3 | +1.0% | 4x base bet |
| +4 | +1.5% | 8x base bet |
| +5 or higher | +2.0% or more | 8x base bet (max) |
Edge estimates assume 6-deck S17 with perfect basic strategy. Each true count point is worth approximately 0.5%. The house starts with a 0.5% edge at a neutral count, so the player breaks even at TC +1 and gains roughly 0.5% for each point above that.
This is called a 1-to-8 spread. Real casino counters often use wider spreads, but larger spreads attract more attention from casino staff. The trainer shows a bet recommendation in the count panel when counts are revealed.
Strategy changes at high counts
Betting more at high counts is only part of it. Some basic strategy decisions also change when the true count is strongly positive or negative. These are called index plays. A few common ones:
- Insurance:Normally always decline insurance. At a true count of +3 or higher, the deck is so rich in tens that insurance becomes a profitable bet. This trainer flags this automatically in the insurance popup.
- 16 vs 10:Basic strategy says surrender if available, otherwise hit. At a true count of 0 or higher, standing becomes correct because the deck is rich in tens and the dealer is more likely to bust.
- 15 vs 10:Basic strategy says surrender or hit. At a true count of +4 or higher, standing is correct for the same reason.
Practicing with this trainer
The count panel on the right side of the trainer shows your running count, true count, and deck temperature after each hand. The cards dealt each hand are listed with their Hi-Lo values so you can check your work.
- Start with Hide mode. Try to keep the running count in your head as each hand is dealt.
- Press Show after each hand to compare your count to the correct value. The cards dealt panel shows each card and its value.
- When your running count is consistent, start dividing by decks remaining to practice the true count. The deck counter is always visible in the top bar.
- Adjust your bet in the bet input based on the true count before each deal. The trainer will show you whether your strategy decisions were correct regardless of count, so you can work on both skills together.
What counting does not do
Card counting does not let you predict individual cards. Even at a true count of +8, you will still lose many hands. The edge from counting is small, around 0.5 to 1 percent over the long run. This means you need a large number of hands before the math works in your favor consistently.
Counting also does not help if your basic strategy is wrong. Every basic strategy mistake costs more than the counting edge gives back. Master basic strategy first. Once your decisions are automatic, add the count.