Updated Fact-checked 12 min read
Marcus Halliday
Senior Editor 9+ yrs
- Published
- Updated
- Fact-checked
Key blackjack terms and definitions
Whether you're just starting out or already consider yourself an experienced player, this glossary breaks down the key terms that shape the blackjack experience — from hand decisions to the finer points of counting and rule variations. A concise but comprehensive reference. Ready to expand your knowledge? Dive in.
A-Z dictionary · 40+ terms40+ termsBeginner-friendlyA-Z indexed
This section breaks down the language of blackjack — from hand decisions to the finer points of counting and rule variations — into clear, beginner-friendly definitions. Use the A–Z index below to jump to any letter, or scroll through the full list.
Blackjack terminology
Every common term defined. Click any letter in the index to jump there.
3
- 3:2 vs 6:5
- The payout for a natural blackjack. 3:2 returns CA$15 on a CA$10 bet; the inferior 6:5 returns only CA$12, roughly tripling the house edge. Always look for 3:2 tables.
B
- Bankroll
- The total amount of money a player has set aside for blackjack. Bankroll management means spreading these funds sensibly across a session, keeping each bet a small fraction of the whole.
- Basic strategy
- The mathematically optimal play for every player hand against every dealer upcard, derived from probability. Following it perfectly minimizes the house edge but doesn't flip it in your favour.
- Blackjack (Natural)
- An ace plus any 10-value card dealt as the first two cards — a total of 21. Beats any other 21 and usually pays 3:2. Also called a 'natural'.
- Burn card
- The top card of a freshly shuffled shoe, which the dealer discards face down before dealing. A holdover from the fight against edge-sorting and card tracking.
- Bust
- When a hand's total goes over 21, it loses immediately. If the player busts, the dealer wins even if the dealer later busts too.
C
- Card counting
- Tracking the ratio of high to low cards left in the shoe to gain an edge. Legal, though countermeasures (shuffling, back-offs) are common. Not cheating — just arithmetic.
D
- DAS (Double After Split)
- A favourable rule allowing a player to double down on a hand created by splitting a pair. Adds roughly 0.13% to player return where offered.
- Double down
- Doubling your original bet after the first two cards in exchange for exactly one more card. Best on strong totals (9–11) against a weak dealer upcard.
E
- Early surrender
- Forfeiting half your bet and folding before the dealer checks for blackjack. The more valuable form of surrender — rare today.
- Even money
- An offer to take a guaranteed 1:1 payout on a player blackjack when the dealer shows an ace, instead of risking a push. Mathematically the same as taking insurance — usually a bad deal.
H
- Hard hand
- A hand with no ace, or one where the ace must count as 1 to avoid busting. Its total is fixed — there's no flexibility, so it has to be played more cautiously.
- Heads-up
- Playing alone against the dealer with no other players at the table. Speeds up the game and is preferred by many counters for greater control over the deck.
- Hi-Lo
- The most popular card-counting system. Cards 2–6 count +1, 7–9 count 0, and 10s through aces count -1. A balanced, level-one system that's ideal for beginners.
- Hit
- Asking for another card to improve your hand total. You can hit as many times as you like until you stand or bust.
- Hole card
- The dealer's face-down card. Players must decide their action without seeing it — its value is the core uncertainty of every hand.
- House edge
- The casino's long-run statistical advantage, expressed as a percentage of each bet. With basic strategy on liberal rules, it can drop to roughly 0.5%.
I
- Insurance
- A side bet offered when the dealer shows an ace, paying 2:1 if the dealer has blackjack. Costs half your original bet. A long-term loser unless you're counting.
L
- Late surrender
- Forfeiting half your bet after the dealer checks for (and doesn't have) blackjack. The common form of surrender; saves money on weak hands like a hard 16 against a 10.
N
- Natural
- Another name for a blackjack — an ace and a 10-value card as the first two cards, totalling 21 and typically paying 3:2.
P
- Penetration
- How deep into the shoe the dealer deals before reshuffling, expressed as a percentage. Deeper penetration (e.g. 75%+) helps counters by exposing more of the deck.
- Pit boss
- The casino employee who oversees a group of table games, handles disputes, monitors play and watches for advantage players.
- Push
- A tie between player and dealer on the same total. No one wins; the player's bet is returned.
- Push 22
- A rule in some variants (notably Blackjack Switch) where a dealer total of 22 pushes against all non-busted player hands instead of counting as a dealer bust. A significant trade-off in the house's favour.
R
- Re-split
- Splitting again after a split when a third matching card appears. Rules cap how many times you may re-split, and split aces are often limited to one card each.
- RTP
- Return to Player — the percentage of total wagers a game pays back over the long run. In blackjack it's the complement of the house edge (e.g. 99.5% RTP = 0.5% edge).
- Running count
- The cumulative tally a counter keeps as cards are revealed, adding and subtracting their assigned values. It's converted to the true count before sizing bets.
S
- Shoe
- The dealing box holding multiple decks (commonly 6 or 8) of shuffled cards. More decks slightly raise the house edge and dilute counting.
- Soft hand
- A hand containing an ace counted as 11 without busting (e.g. A-6 = soft 17). The ace can drop to 1 later, giving the hand two possible totals and extra flexibility.
- Spanish 21
- A blackjack variant played with a 48-card 'Spanish' deck (no 10-pip cards). Offers liberal rules and bonus payouts to make up for the missing tens.
- Split
- When dealt a pair, separating it into two hands by placing a second, equal bet. Each hand is then played independently. Always split aces and eights.
- Stand
- Declining further cards and keeping your current total. The dealer then plays out their hand against yours.
- Stand on 17 (S17 / H17)
- Whether the dealer must stand on all 17s (S17) or hit a soft 17 (H17). S17 is better for the player; H17 adds about 0.22% to the house edge.
- Surrender
- Giving up a hand and getting half your bet back rather than playing it out. Comes in early and late forms; correct only on the weakest hands.
T
- True count
- The running count divided by the number of decks left in the shoe. It standardizes the count so bet sizing reflects the real, per-deck advantage.
U
- Unit
- The base betting amount a player uses as a reference, e.g. one unit = CA$25. Bet ramps and bankroll guidelines are expressed in units, not raw cash.
- Upcard
- The dealer's face-up card, visible to all players. Basic strategy decisions hinge on it — a dealer 2–6 is weak, a 7 through ace is strong.