Card counting · The law
Is card counting illegal?
No. Card counting is thinking, and thinking is not a crime anywhere in the United States. But the full answer has a second half every counter needs to understand.
This page explains widely established facts about gambling law. It is not legal advice.
The short answer
There is no federal or state law against using your brain to track cards at a blackjack table. Courts have consistently treated mental card counting as legitimate play, not cheating. Cheating means breaking the rules of the game: marked cards, colluding with the dealer, or using a device. Counting uses only the cards the casino shows you and the decisions the rules allow.
The line is the device. Nevada and New Jersey specifically outlaw using any device to help count or predict cards, and doing so can be a criminal offense. Your phone, a hidden computer, anything electronic: leave it out of it. The system on this site, Hi-Lo, is pure mental arithmetic, which is exactly why it is legal.
What casinos can do about it
Legal and tolerated are different things. Casinos are private businesses, and in most states they can refuse service to anyone who is not in a protected class. That includes card counters. The standard progression:
The backoff. A pit boss politely tells you that you are welcome to play anything except blackjack. This is the famous "tap on the shoulder." It is not an arrest and not an accusation; it is a business declining your blackjack action.
Flat-betting. Some casinos let you keep playing but cap your bets, which removes the counter's weapon: varying bet size with the count.
The trespass. If you are asked to leave and refuse, or you return after being barred, that becomes trespassing, which is a real offense. When told to leave, leave.
Casinos also fight counting without confrontation: shuffling when the count goes positive, cutting the shoe shallow so the count never develops, and limiting bet spreads. These countermeasures are why game selection matters as much as skill.
The New Jersey exception
Atlantic City works differently because of a 1982 New Jersey Supreme Court decision, Uston v. Resorts International. Professional counter Ken Uston sued after being barred from Atlantic City casinos, and the court ruled that the state's gaming regulations did not give casinos the right to exclude card counters. In New Jersey, casinos cannot bar you from blackjack just for counting.
They adapted instead. New Jersey casinos use aggressive countermeasures: frequent shuffling, shallow penetration, and table limits that make spreading difficult. The legal right to stay does not create a beatable game. It is a good illustration of the general rule: the law protects your right to think, not your right to a profitable table.
Staying on the right side
- Count in your head only. Never use a phone, computer, or any device at the table.
- Do not mark cards, bend them, or collude with anyone. That is cheating, and it is prosecuted.
- If you are backed off, leave quietly. Arguing turns a non-event into a trespass.
- Know the local rules. Tribal casinos operate under tribal-state compacts, not state gaming commissions, and their policies are their own.
- Keep records of your sessions and your bankroll. Professionals treat it like a business because it is one.
Frequently asked questions
Can a casino take my chips if they catch me counting?
No. Your chips are your property. A casino can ask you to leave, bar you from blackjack, or trespass you from the property, but it cannot confiscate chips you won fairly.
Can I be arrested for counting cards?
Not for counting in your head. Arrests in this area involve cheating devices, marked cards, or refusing to leave after being trespassed. Thinking is not a crime.
Is card counting cheating?
No. Cheating means breaking the rules of the game: marked cards, collusion with the dealer, devices. Counting uses only information the casino shows you and decisions the rules allow.
What about online casinos?
Counting is not illegal online either, but it rarely works: most online blackjack reshuffles every hand or uses a continuous shuffler, which erases the count. Live-dealer games vary.