How to count cards in blackjack: the Hi-Lo system

Card counting has nothing to do with memorizing which cards have been played. It is one running number in your head, updated with simple +1/−1 arithmetic, that tells you when the remaining shoe is rich in tens and aces — the moments when blackjack briefly favors the player. The Hi-Lo count is the system used by most professional players and every famous counting team, and anyone who can add one and subtract one can learn it.

Step 1 — the tag values

Every card gets a tag:

Low cards leaving the shoe are good for you (that's why they're +1): what remains gets richer in tens and aces, which means more player blackjacks paid at 3:2, more dealer busts, and stronger doubles.

Step 2 — the running count

Start at 0 when the shoe is shuffled. Every card you see — yours, other players', the dealer's — adjusts the count by its tag. See a 5? +1. See a king? −1. See an 8? Nothing. That single number is the running count, and keeping it accurately while cards fly is 90% of the skill. It's a speed and accuracy habit, built exactly the way the trainer drills it: one card at a time, then pairs, then full rounds at real dealing speed.

Step 3 — the true count

A running count of +6 means something very different with five decks left than with one deck left. Divide the running count by the number of decks remaining (estimate to the nearest half deck) to get the true count:

True count = running count ÷ decks remaining

The true count is the number every decision keys off — it's your measure of concentration of high cards, not just quantity.

Step 4 — bet with the count

The count's real payoff is bet sizing. A common ramp with a 1–8 unit spread: bet the minimum at true count +1 or below, then add roughly one unit per point of true count above +1. Big bets go out only when the shoe actually favors you; minimum bets pay the "waiting tax" the rest of the time. The true count guide works an example end to end.

Step 5 — deviations (the last 1%)

At high counts, a handful of basic-strategy plays flip — the famous Illustrious 18. Learn these only after the count itself is automatic; they're worth far less than accurate counting and bet sizing.

How long does it take?

With focused drills: tag values in a day, a reliable running count in a week or two, true-count conversion and betting in about a month of short daily sessions. The trainer's Journey path follows exactly this ladder, and every drill deals from a genuinely depleting shoe — so the count you keep is real, never faked. And yes, counting is legal — casinos just don't like it.