Game guide · Playbook Brand
Blackjack
Blackjack is a card game where you try to get closer to 21 than the dealer without going over. You make decisions – hit, stand, double, split – that genuinely affect the outcome. With basic strategy, the house edge drops to about 0.5%, making it the best odds in the casino. Without it, the edge climbs to 2% or more.
How the game works
Card values
- Number cards (2–10): Face value
- Face cards (J, Q, K): 10
- Ace: 1 or 11 – whichever helps your hand more
A hand with an ace counted as 11 is called a “soft” hand (e.g., Ace + 6 = soft 17). It’s soft because you can’t bust on the next card – the ace can switch to 1.
Playing a hand
- Place your bet. Set your wager before any cards are dealt.
- Receive two cards. You get two cards face up. The dealer gets one card face up (the “upcard”) and one face down (the “hole card”).
- Check for blackjack. If your first two cards total 21 (an ace plus a 10-value card), that’s a blackjack – you win automatically at 3:2 payout (unless the dealer also has blackjack, which is a push).
- Make your decisions. Based on your hand and the dealer’s upcard, you choose from the available actions (see below).
- Dealer plays. After all players finish, the dealer reveals the hole card and follows mandatory rules – typically hitting until reaching 17 or higher.
- Compare totals. Closer to 21 wins. Going over 21 (busting) is an automatic loss. Ties (pushes) return your bet.
Your decisions
| Action | What it means | When it’s available |
|---|---|---|
| Hit | Take another card | Anytime your hand is below 21 |
| Stand | Keep your current hand – no more cards | Anytime |
| Double down | Double your bet and receive exactly one more card | Usually on your first two cards only |
| Split | If you have two cards of the same value, split them into two separate hands, each with its own bet | When your first two cards match |
| Surrender | Give up half your bet and fold the hand | Some tables, on first two cards only |
| Insurance | A side bet that the dealer has blackjack (pays 2:1) | When the dealer’s upcard is an ace |
Dealer rules
The dealer has no choices. The dealer follows a fixed script:
- Dealer hits on 16 or below. Always.
- Dealer stands on 17 or above. At most tables. (Some tables require the dealer to hit on “soft 17” – this slightly increases the house edge.)
The dealer can’t double down, can’t split, can’t surrender. The dealer just follows the rules. That’s it.
Bet types
| Bet | What it means | Payout | House edge |
|---|---|---|---|
| Base bet | Your main wager on the hand | 1:1 (even money) | 0.5% (basic strategy) to 2%+ |
| Blackjack | Natural 21 on first two cards | 3:2 (or 6:5 at some tables) | – |
| Insurance | Side bet that dealer has blackjack | 2:1 | ~7.7% |
| Side bets (Perfect Pairs, 21+3, etc.) | Bets on specific card combinations | Varies (5:1 to 100:1+) | 2–11%+ |
Key point: Insurance and most side bets carry a much higher house edge than the base game. Insurance in particular is almost always a bad deal mathematically. Basic strategy says: skip it.
6:5 vs. 3:2 blackjack: Some tables pay 6:5 on a natural blackjack instead of 3:2. On a $10 bet, that’s $12 instead of $15. This single rule change increases the house edge by about 1.4%. Check the table sign before you sit down.
The math
House edge
| Scenario | House edge |
|---|---|
| Basic strategy, favorable rules (3:2, stand on soft 17, 6 decks) | ~0.5% |
| Basic strategy, standard rules | ~0.6–0.8% |
| Average player (no basic strategy) | ~2–2.5% |
| 6:5 payout table (even with basic strategy) | ~1.5–2% |
What this means for your wallet
With basic strategy at a standard table, the house edge is about 0.5%. For every $100 you bet over time, you’d lose about 50 cents on average. Without basic strategy, that climbs to about $2–$2.50 per $100.
The difference between knowing basic strategy and not knowing it is the difference between the best odds in the casino and average ones. The strategy itself takes about 20 minutes to learn.
Compared to other games: See Odds at a Glance.
Basic strategy
Basic strategy is the mathematically optimal decision for every possible hand combination. It was figured out by running millions of simulated hands through computers. It’s not a “system” or a “trick” – it’s just the math.
The strategy depends on your hand total and the dealer’s upcard. Here’s a simplified reference:
Hard hands (no ace, or ace counted as 1)
| Your hand | Dealer shows 2–6 | Dealer shows 7–A |
|---|---|---|
| 8 or less | Hit | Hit |
| 9 | Double (or hit) | Hit |
| 10 | Double (or hit) | Hit if dealer shows 10 or A |
| 11 | Double | Double (or hit vs. A) |
| 12 | Stand (hit vs. 2 or 3) | Hit |
| 13–16 | Stand | Hit |
| 17+ | Stand | Stand |
Soft hands (ace counted as 11)
| Your hand | Dealer shows 2–6 | Dealer shows 7–A |
|---|---|---|
| Soft 13–15 | Hit (double vs. 5–6) | Hit |
| Soft 16–18 | Double (or stand vs. 7–8) | Hit (stand on soft 18 vs. 7–8) |
| Soft 19+ | Stand | Stand |
Pairs
| Your pair | Dealer shows 2–6 | Dealer shows 7–A |
|---|---|---|
| A, A | Always split | Always split |
| 8, 8 | Always split | Always split |
| 10, 10 | Never split | Never split |
| 5, 5 | Never split – treat as 10 | Never split – treat as 10 |
| 4, 4 | Hit | Hit |
| Other pairs | Split | Hit |
Note: This is a simplified version. Exact strategy varies slightly with the number of decks and specific table rules. Full strategy charts for every rule variation are widely available online.
Tips for informed play
- Learn basic strategy. It takes about 20 minutes and cuts the house edge in half. It’s the single most impactful thing you can do at a blackjack table. Free charts are available everywhere.
- Check the table rules before you sit down. Look for 3:2 blackjack payout (not 6:5), and check whether the dealer stands or hits on soft 17. These details change the math significantly.
- Skip insurance. The math doesn’t support it at a 7.7% house edge. Basic strategy says decline it every time.
- Set your budget before you play. Decide on a session bankroll and a bet size. A common guideline: your bet should be about 1–2% of your session budget, giving you enough hands to let the strategy work.
- Don’t worry about other players. The person next to you making a “bad” play doesn’t affect your odds. Each hand plays out against the dealer independently.
Key terms
- Blackjack
- A hand totaling 21 with exactly two cards (an ace + a 10-value card). Pays 3:2 at standard tables.
- Bust
- Going over 21. Automatic loss, regardless of what the dealer has.
- Hit
- Request an additional card.
- Stand
- Keep your current hand. No more cards.
- Double down
- Double your bet and receive exactly one more card. A commitment – you can’t hit again after.
- Split
- Divide a pair into two separate hands, each with its own bet.
- Push
- A tie. Your hand and the dealer’s hand have the same total. Your bet is returned.
- Shoe
- The dealing device that holds multiple decks of cards. Most casino blackjack uses 6 or 8 decks.
- Insurance
- A side bet offered when the dealer’s upcard is an ace. Pays 2:1 if the dealer has blackjack. House edge: ~7.7%. See glossary.
- Surrender
- Forfeit half your bet and fold. Available at some tables on your first two cards. Used in specific situations where the math favors cutting losses.
- Soft hand
- A hand containing an ace counted as 11 (e.g., A-6 = soft 17). Can’t bust on the next hit.
- Hard hand
- A hand with no ace, or where the ace must count as 1 to stay under 21.
Common myths
What people believe, and what probability tells us.
Myth
Betting Systems Beat the House
The reality
Martingale = delayed ruin
By the numbers
With a $10 starting bet on roulette, 8 consecutive losses (which happen ~1 in 170 attempts) requires a $2,560 bet – often exceeding table limits.Myth
The Dealer Is Hot or Cold
The reality
Dealers follow a script
By the numbers
Blackjack dealers make zero decisions. They follow a mandatory script printed on the felt.Myth
Card Counting Is Easy Money
The reality
Real but tiny edge, huge effort
By the numbers
Even a skilled card counter’s edge is typically 0.5–1.5% – meaning thousands of hands before the advantage plays out, with high variance along the way.
Knowledge check
Pick an answer to reveal the explanation. Nothing is scored or saved.
Part of the Playbook Brand system, the open, public-domain core for player education. You can copy and adapt it under CC0.