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 consider yourself an experienced player, this glossary breaks down the key terms that shape the blackjack experience — from hand decisions to the nuances 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 nuances 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 $15 on a $10 bet; the inferior 6:5 returns only $12, roughly tripling the house edge. Always seek 3:2 tables.
B
- Bankroll
- The total amount of money a player has set aside for blackjack. Bankroll management is the practice of allocating these funds wisely across a session, keeping each bet a small fraction of the whole.
- Basic strategy
- The mathematically optimal play for every player hand versus every dealer upcard, derived from probability. Following it perfectly minimises the house edge but does not 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 that the dealer discards face-down before dealing. A holdover from countering edge-sorting and tracking.
- Bust
- When a hand's total exceeds 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 remaining in the shoe to gain an edge. Legal but 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 surrender variant — 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 plays 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 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 ideal for beginners.
- Hit
- Requesting 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 fall 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 surrender form; saves money on weak hands like hard 16 vs a 10.
N
- Natural
- Another name for a blackjack — an ace and a 10-value card in the opening 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 overseeing a group of table games, handling disputes, monitoring play, and watching 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 the dealer busting. A significant house-favourable trade-off.
R
- Re-split
- Splitting again after a split when a third matching card appears. Rules cap how many times you may re-split, and aces are often restricted to one card each.
- RTP
- Return to Player — the percentage of total wagers a game returns over the long run. On 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 offset 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 reclaiming half your bet 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 remaining in the shoe. It standardises 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 = $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-ace is strong.