Card counting is a way of tracking whether the cards left in a blackjack shoe are rich in high or low cards.
You give each card a value of +1, 0 or -1, keep a running total, convert it to a true count and adjust your bets as it moves. The trainer below lets you practice that count at your own pace.
New to counting? Read the sections below first, then come back and run a drill. Setup instructions are further down the page.
- Give every 2 to 6 a value of +1, every 7 to 9 a value of 0, and every 10, face card and ace a value of -1.
- Start at zero after the shuffle and add the value of each card as it's dealt.
- Bet more when the count is positive (more high cards left) and less when it's negative (more low cards left).
What Is Card Counting?
Card counting is a technique that tells blackjack players when the house edge shifts in their favour. You don't memorise every card. You track one number.
High cards (10s, face cards and aces) help you more than the dealer. They bring more blackjacks paying 3 to 2, stronger double downs and more dealer busts, since the dealer must hit 12 through 16.
Low cards (2 through 6) help the dealer complete those hands. The 7, 8 and 9 are close to neutral. The most common way to track that balance is the Hi-Lo system.
How Does the Hi-Lo Count Work?
The Hi-Lo system, the one the above trainer uses, tags each card:
- 2, 3, 4, 5, 6: +1
- 7, 8, 9: 0
- 10, J, Q, K, A: -1
A full deck has 20 cards on each side, so counting through one deck always ends at zero. That makes Hi-Lo a balanced count.
Start at zero after every shuffle. If the first player shows a 3, a 6 and a 10, your running count is +1. Keep adding every card on the table, the dealer's included, and carry the total from round to round until the next shuffle.
That total is the running count. In multi-deck games, it has to be converted into a true count before it tells you anything useful.
How Do You Convert the Running Count to a True Count?
A running count of +6 means a lot with one deck left and very little with five. The true count measures the count per deck:
True count = running count ÷ decks remaining
In a six-deck game with a running count of +8 and about four decks in the discard tray, two decks remain, so the true count is +4. Round fractions down. In single- and double-deck games, many counters bet off the running count alone.
How Should Your Bets Change With the Count?
At a true count of +1 or lower, keep your bet at your minimum unit. As the count rises, raise your bet in steps, and drop back as soon as it falls.
Each point of true count moves the edge by roughly half a percentage point, so in a typical six-deck game the balance only tips toward the player at about +2. Specific hands also change at set counts, covered in our guide to counting deviations in blackjack.
Does Card Counting Work?
It can, but the margin is thin. A skilled Hi-Lo counter typically holds an edge of around 0.5% to 1%, and only in games with good rules, a 3-to-2 blackjack payout and deep penetration (around 75% of a six-deck shoe dealt before the shuffle).
A small edge takes a huge number of hands to show, so counters still lose plenty of sessions. Nothing about counting guarantees a result.
Does Card Counting Work Online?
No. RNG blackjack shuffles the virtual deck before every hand, so there's nothing to track. Live dealer tables deal from a shoe but usually reshuffle long before it runs deep.
When you play blackjack online, basic strategy is the skill that carries over, and the trainer helps you understand the game and sharpen your mental arithmetic.
How to Use the Card Counting Trainer
The trainer flashes two to six cards at a time. Add their tags, carry the total forward and enter your running count when asked.
- Choose one deck or six decks.
- Set the speed (rounds per minute) with the slider.
- Under "Ask me for the running count every", pick 10 to 30 seconds, or "Never" to run through every card.
- When the drill stops, type your count (for example +5 or -6) and click "Submit". The trainer shows the correct count if you miss and scores your accuracy at the end.
- Click "Pause" any time for extra time, and click again to resume.
Tips for Practising Card Counting
- Start in single-deck mode at slow speed, with the count requested every 10 or 15 seconds. Accuracy comes first.
- Once you're at 100%, raise the speed one step at a time, then move to six-deck mode.
- Cancel pairs: a high and a low card in the same round add up to zero, so you only count what's left.
Blackjack Card Counting – FAQ
Is card counting illegal?
No. Counting cards in your head is legal. Using a device to count is illegal in many jurisdictions, and casinos can still ask a player they suspect of counting to stop playing blackjack. Find out how casinos spot card counters and what happens next.
Do card counters memorise every card?
No. They track a single running total, adding and subtracting one point at a time. Nothing else needs remembering.
How long does it take to learn card counting?
The Hi-Lo tags take minutes to learn. Keeping an accurate count at casino speed takes regular practice, and a common benchmark is counting down a full deck accurately in under 30 seconds.
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