Card counting · Hi-Lo system
Hi-Lo card counting: the complete drill and guide
Counting cards is arithmetic at speed. High cards left in the shoe help you; low cards help the dealer. The Hi-Lo system turns every card into +1, 0, or −1. This page teaches the system, then drills it until it is automatic.
The values
| Card | Hi-Lo value | Why |
|---|---|---|
| 2, 3, 4, 5, 6 | +1 | Low cards help the dealer make hands. When they leave the shoe, the remaining deck favors you. |
| 7, 8, 9 | 0 | Neutral. Ignore them. |
| 10, J, Q, K, A | −1 | High cards make blackjacks and good doubles. When they leave, the deck favors the house. |
Running count is the total as cards come out. True count is the running count divided by the decks left in the shoe. Counters bet bigger around a true count of +2 and up, and bet the minimum (or sit out) when it goes negative.
How counting actually works
Forget the movie version. Nobody memorizes cards. You maintain one number, the running count, and update it as each card appears: plus one for a low card, minus one for a high card, nothing for 7, 8, or 9. A full table deals about 100 hands an hour, so you are doing roughly two small additions per hand. That is the whole skill, and it is learnable in weeks.
The running count alone is not enough, because a +6 means different things with one deck left than with five. True count fixes that: divide the running count by the number of decks you estimate remain in the shoe. A running count of +6 with 3 decks left is a true count of +2. You estimate decks left by glancing at the discard tray; with practice you can judge to the nearest half deck without thinking.
Each point of true count is worth roughly half a percent of edge. A typical shoe game deals you about −0.5% off the top with perfect basic strategy, so the game turns in your favor around a true count of +1 to +2. That is when counters raise their bets. When the true count is zero or negative, they bet the table minimum or sit out entirely.
Two skills multiply the count. Bet correlation is sizing bets with the count, which is where most of the money comes from. Playing correlation is changing a few plays with the count, the Illustrious 18. Hi-Lo is strong at both, which is why it remains the standard system decades after it was published.
A practice plan that works
Week 1: one deck, no clock. Flip through a single deck one card at a time, keeping the count. A full deck always ends at zero, which is your built-in answer key. When you can do it without errors, flip two cards at a time and cancel pairs (+1 with −1, low with low).
Week 2: add speed. Use the drill below. Start with 10 cards on slow, then move to 25 and full-deck rounds. Your target is a full deck in under 30 seconds with zero mistakes.
Week 3: true count conversion. Deal yourself a running count, glance at a discard pile, and estimate decks remaining to the nearest half deck. Divide. Do it until the division feels like nothing.
Week 4: casino conditions. Count with the TV on, while holding a conversation, while someone deals to you quickly. If the count survives distraction, it will survive a casino floor.
Only then think about bet spreads and deviations. Most failed counters skipped straight to betting big while their count was still shaky.
The drill
Cards are out. What is the running count?
Mistakes that cost counters
- Counting 7, 8, and 9. They are zero. Every counter who struggles is secretly counting neutral cards.
- Forgetting the count after a distraction. Practice recovering: if you lose it, the round is over. Start over.
- Playing basic strategy at 95% instead of 100%. Strategy mistakes cost more than the count earns. Drill basic strategy first.
- Spreading bets wildly at low-limit tables. A 1-to-12 spread at a $10 table is a neon sign. Match your spread to the game.
- Counting games you cannot beat: continuous shufflers, shallow penetration, and 6:5 tables. Read why 6:5 kills counting.
Before you count for real
Counting is legal. Casinos are private businesses and can still ask you to leave or bar you from blackjack. The full legal picture. You also need perfect basic strategy first: every strategy mistake costs more than the count earns. Drill basic strategy here.
Keep it in perspective
A good counter earns roughly a 0.5% to 1.5% edge and still needs a real bankroll to survive the swings. Run your numbers before you imagine quitting your job.
Frequently asked questions
Do I have to memorize every card to count?
No. You maintain a single running number: +1 for 2 through 6, 0 for 7 through 9, −1 for 10 through ace. Cancel pairs as you go and the count updates itself.
How long does it take to learn Hi-Lo?
Most people can keep an accurate running count through a single deck within a week of daily practice, and reach casino speed (a full deck in under 30 seconds) within a month. True count conversion and bet sizing take longer.
At what true count should I raise my bets?
A common ramp starts raising at a true count of +2, since the edge turns positive around +1. The exact ramp depends on your bankroll and how much attention you want to avoid; the bankroll calculator shows what different edges mean in dollars.
Can casinos tell if I am counting?
They look for bet spread correlated with the count, session length, and behavior, not for the counting itself. Counting is legal, but casinos can still back you off or bar you from blackjack.
Does card counting work online?
Not at games with a continuous shuffler or a reshuffle every hand, which is most online blackjack. Live-dealer games with real penetration can be countable in theory, but the pace and penetration rarely make it worthwhile.
Do I need the Illustrious 18 too?
Not at first. Bet sizing with the count is where most of the profit comes from. Learn the 18 deviations after your count and basic strategy are both automatic.