Blackjack card counting works by noticing when the cards left in the shoe favour you, then betting more at those moments. The edge it produces is small and comes from depleted shoes, which is exactly what an online RNG table does not have: in most online casinos the deck is reshuffled at the start of every round, so a counter's number is always zero when the cards come out.
That is the short answer. The rest of this page is the arithmetic behind it, so you can price a count yourself instead of taking anyone's word for it, including ours.
On this page
The Hi-Lo count in one table
Hi-Lo, the count most players learn first, gives every card one of three values:
| Cards | Hi-Lo value | Why |
|---|---|---|
| 2, 3, 4, 5, 6 | +1 | Small cards leaving the shoe help the player |
| 7, 8, 9 | 0 | Roughly neutral |
| 10, J, Q, K, A | −1 | Tens and aces leaving the shoe help the dealer |
A deck holds 20 cards worth +1 and 20 worth −1, plus 12 neutral ones, so a full deck adds up to exactly 0. Count every card through a shoe and you end on 0 too. That balance is what makes the running total meaningful: a positive number means more small cards have gone, and the remainder is rich in tens and aces, which raise your chance of a natural and the dealer's chance of busting.
The idea is older than any online casino. Edward Thorp's book Beat the Dealer set it out in 1962.
Running count, true count: the formula
Running count (RC) = the sum of the Hi-Lo values of every card seen since the shuffle.
True count (TC) = RC ÷ decks remaining to be dealt.
In symbols: TC = RC / D.
The division matters because the same surplus of tens is spread thinner in a fuller shoe. Wizard of Odds gives the standard example: a running count of +7 with about four decks left is 7 ÷ 4 = 1.75, rounded to a true count of 2.
| Running count | Decks left | True count |
|---|---|---|
| +7 | 4 | +1.75, call it +2 |
| +7 | 2 | +3.5 |
| +7 | 1 | +7 |
| −6 | 3 | −2 |
The same +7 is worth almost nothing early in an eight-deck shoe and a great deal near the end of it.
Edge by true count: the calculation
A common rule of thumb says each true count point moves the edge about half a percent towards the player. A Las Vegas Advisor article tested that with simulations of the Hi-Opt I count, a close relative of Hi-Lo, in a four-deck game starting at −0.48% for the player. Its results, set against the rule of thumb, edge ≈ −0.48% + 0.5% × TC:
| True count | Rule of thumb | Simulated, half the shoe dealt | Simulated, 87.5% dealt |
|---|---|---|---|
| −2 | −1.48% | −1.40% | −1.30% |
| 0 | −0.48% | −0.41% | −0.38% |
| +1 | +0.02% | +0.10% | +0.18% |
| +2 | +0.52% | +0.53% | +0.66% |
| +3 | +1.02% | +0.87% | +1.13% |
| +4 | +1.52% | +1.36% | +1.80% |
| +5 | +2.02% | +1.58% | +2.22% |
The author's conclusion: a point is worth about 0.3% to 0.4% early in the shoe and 0.7% to 0.9% deep in it, averaging about 0.5%, and the relationship is not a straight line. Use the half-percent figure as a quick estimate, not a promise.
From edge to money. Expected result per hand = stake × edge.
| Scenario | Bet | Edge | Expected result per hand | Per 100 such hands |
|---|---|---|---|---|
| RNG table, reshuffled each round (TC always 0) | $10 | −0.48% | −$0.048 | −$4.80 |
| Live shoe, TC 0 | $10 | −0.41% | −$0.041 | −$4.10 |
| Live shoe, TC +2, bet raised | $50 | +0.53% | +$0.27 | +$26.50 |
| Live shoe, TC +4, bet raised | $100 | +1.36% | +$1.36 | +$136 |
| Live shoe, TC −2, minimum bet | $10 | −1.40% | −$0.14 | −$14 |
The plus rows look attractive, but they only apply to the hands where the count actually reaches +2 or +4. Most hands are dealt near zero, where you still pay the house.
Why blackjack card counting fails online
RNG tables. A fresh shuffle every round means every hand comes from a complete deck. Your running count restarts at 0 before each deal, so the true count is 0, the edge is the ordinary basic-strategy edge, and raising your bet never meets a favourable shoe. The first row of the table above is the only row an RNG player ever sees.
Unlimited-seat live tables. Evolution describes its Infinite Blackjack as dealing one shared starting hand to an unlimited number of players, using a mix of physical and virtual cards. A count of the physical cards on screen misses the virtual ones, so it is not a true picture of the shoe.
Seven-seat live tables. These are dealt from a real shoe, so counting is possible in principle. What decides the result is penetration: how much of the shoe is dealt before the reshuffle. On the Wizard's six-deck simulations, dealing 4 decks with a 1-to-5 bet spread gave the counter 0.157%; dealing 5 decks with a 1-to-15 spread gave 1.147%. On $1,000 staked, that is $1.57 against $11.47 expected. Las Vegas Advisor puts typical land-casino penetration at about 75%, says shallower games are not worth counting, and notes its analysis does not cover online play. The live table rules we have read do not state where the shuffle card goes, so you would have to watch it yourself.
The casino's side. Casinos object to counting and try to stop it, up to banning players they believe are counters. Our casino records do not track clauses on advantage play, so read the terms of your casino before betting a spread.
Play live and RNG blackjack with crypto.
What changes the result most
- Reshuffle frequency. Every round: counting is worth exactly nothing. Deep in a shoe: it can be worth around a percent.
- Penetration. The same count is worth more deep in the shoe, as the two simulated columns show. At 66% penetration, a true count above 6 comes about once in 300 hands.
- Bet spread. Edge on a +4 hand only pays if more money is out on it. Flat betting through a shoe earns roughly the off-the-top edge.
- Base rules. A 6:5 natural costs about 1.4 points, more than a typical count advantage. Our house edge page prices each rule.
- Basic strategy errors. A counter who misplays hands gives the edge straight back. Learn the basic strategy chart first.
Checklist before you try blackjack card counting
- Is the table RNG? Then stop: the count resets every round.
- Is it an unlimited-seat live format with virtual cards? Same answer.
- On a seven-seat live table, how much of the shoe is dealt before the reshuffle?
- Do the blackjack rules on the table pay 3:2 and let the dealer stand on soft 17?
- Have you read the casino's terms on advantage play?
- Can your bankroll take the swings of a bet spread? The cheaper route to a lower edge is picking the right table, covered in live blackjack.
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Questions and answers
Does blackjack card counting work online?
Not at RNG tables. Most online casinos shuffle at the start of every round, so each hand comes from a full deck and the count resets to zero.
How much is one true count point worth?
On average about half a percent of edge in published simulations, less early in the shoe and more deep into it. It is a rough guide, not a straight line.
Can you count cards at live dealer tables?
In principle, because the cards come from a physical shoe. In practice the result depends on how deep the dealer goes before reshuffling, which the table rules we have read do not state.
What is the difference between running count and true count?
The running count is the plain total of card values seen. The true count divides it by the decks still to be dealt, so the same running count means more near the end of the shoe.