What Is Blackjack?
Blackjack is the most widely played casino table game in the world, and the reason is straightforward: it gives skilled players the lowest house edge of any table game. With perfect basic strategy, the house edge drops to around 0.5%. Without it, most players are giving away 2% to 4% on the same game. That gap is entirely within your control.
The goal is simple. Get a higher hand than the dealer without going over 21. Everything else, when to hit, stand, double, split, or surrender, is driven by basic strategy. There are no hunches involved. Every correct decision is mathematically defined.
Card Values
| Card | Value |
|---|---|
| 2 through 10 | Face value |
| Jack, Queen, King | 10 |
| Ace | 11, or 1 if 11 would cause a bust |
A soft hand contains an Ace counted as 11. A hard hand either has no Ace, or an Ace that must count as 1 to avoid busting. This distinction matters because basic strategy treats soft and hard totals differently.
How to Play Blackjack
- Place your bet. All bets go down before any cards are dealt.
- Receive two cards. Both your cards are dealt face up. The dealer receives one card face up and one face down (the hole card).
- Check for Blackjack. A two-card total of 21 (Ace plus any 10-value card) is a Blackjack. It pays 3:2 at most tables. If the dealer also has Blackjack, the hand pushes.
- Play your hand. Based on your total and the dealer’s up card, choose Hit, Stand, Double, Split, or Surrender.
- Dealer plays. After all players have acted, the dealer reveals the hole card and plays by fixed rules. The dealer must hit on 16 or below and stand on hard 17 or above. Most casinos also require the dealer to hit soft 17.
- Settle the bet. Hands closer to 21 than the dealer win even money. Dealer busts and all remaining players win. Ties push.
Blackjack Trainer
Play against the dealer with real Vegas rules. Turn on Strategy Mode to see the correct basic strategy play highlighted after every deal.
Player Actions
Hit
Take another card. You can hit as many times as you want until you stand, bust, or reach 21.
Stand
Take no more cards and end your turn with the hand you have.
Double Down
Double your original bet and receive exactly one more card. You cannot take additional cards after doubling. Most casinos allow doubling on any two-card total. Basic strategy identifies specific situations where doubling is the correct play, and those opportunities should not be passed up.
Split
When your first two cards are a pair, you can split them into two separate hands, each with its own bet equal to the original. You then play each hand independently. Never split 5s or 10s. Always split Aces and 8s.
Surrender
Forfeit the hand and recover half your bet. Only available on the first two cards before any other action. Late surrender (after the dealer checks for Blackjack) is the most common version. It is the correct play in a specific set of situations and reduces the house edge when available.
Dealer Rules
The dealer has no decisions to make. The rules are fixed. The dealer hits on any total of 16 or below and stands on hard 17 or above. At most casinos, the dealer also hits soft 17 (Ace plus 6). This rule slightly increases the house edge compared to a dealer who stands on all 17s. Check the table before you sit down.
Blackjack Payouts and Why 3:2 Matters
| Outcome | Payout |
|---|---|
| Blackjack (3:2 table) | 1.5x your bet |
| Blackjack (6:5 table) | 1.2x your bet |
| Regular win | 1:1 (even money) |
| Push (tie) | Bet returned |
| Dealer Blackjack, you do not have it | Lose bet |
| Surrender | Half bet returned |
The difference between 3:2 and 6:5 Blackjack is not cosmetic. A 6:5 payout adds roughly 1.4% to the house edge on its own. At a $25 minimum table playing 80 hands per hour, that difference costs you around $28 per hour more than the 3:2 version of the same game. Avoid 6:5 tables entirely.
Basic Strategy
Basic strategy is the mathematically optimal way to play every possible hand combination in blackjack. It is not a system or a theory. It is a solved set of decisions based on the composition of the remaining deck. Following it correctly reduces the house edge to approximately 0.5% on a standard multi-deck game.
The table below covers a standard 6-deck game where the dealer hits soft 17, doubling after splits is allowed, and late surrender is available. These are the most common rules in both live and online casinos.
Basic Strategy Chart
Key: H = Hit, S = Stand, D = Double (hit if not allowed), SP = Split, R = Surrender (hit if not allowed)
| Your Hand | 2 | 3 | 4 | 5 | 6 | 7 | 8 | 9 | 10 | A |
|---|---|---|---|---|---|---|---|---|---|---|
| Hard Totals | ||||||||||
| 17+ | S | S | S | S | S | S | S | S | S | S |
| 16 | S | S | S | S | S | H | H | R | R | R |
| 15 | S | S | S | S | S | H | H | H | R | R |
| 13, 14 | S | S | S | S | S | H | H | H | H | H |
| 12 | H | H | S | S | S | H | H | H | H | H |
| 11 | D | D | D | D | D | D | D | D | D | H |
| 10 | D | D | D | D | D | D | D | D | H | H |
| 9 | H | D | D | D | D | H | H | H | H | H |
| 5, 6, 7, 8 | H | H | H | H | H | H | H | H | H | H |
| Soft Totals (Ace counted as 11) | ||||||||||
| A, 9 (20) | S | S | S | S | S | S | S | S | S | S |
| A, 8 (19) | S | S | S | S | D | S | S | S | S | S |
| A, 7 (18) | D | D | D | D | D | S | S | H | H | H |
| A, 6 (17) | H | D | D | D | D | H | H | H | H | H |
| A, 4, A, 5 (15, 16) | H | H | D | D | D | H | H | H | H | H |
| A, 2, A, 3 (13, 14) | H | H | H | D | D | H | H | H | H | H |
| Pairs | ||||||||||
| A, A | SP | SP | SP | SP | SP | SP | SP | SP | SP | SP |
| 10, 10 | S | S | S | S | S | S | S | S | S | S |
| 9, 9 | SP | SP | SP | SP | SP | S | SP | SP | S | S |
| 8, 8 | SP | SP | SP | SP | SP | SP | SP | SP | SP | R |
| 7, 7 | SP | SP | SP | SP | SP | SP | H | H | H | H |
| 6, 6 | SP | SP | SP | SP | SP | H | H | H | H | H |
| 5, 5 | D | D | D | D | D | D | D | D | H | H |
| 4, 4 | H | H | H | SP | SP | H | H | H | H | H |
| 2, 2 and 3, 3 | SP | SP | SP | SP | SP | SP | H | H | H | H |
Insurance: Never Take It
When the dealer shows an Ace, you will be offered insurance at 2:1 odds. The bet wins if the dealer has Blackjack. It sounds like protection, but the math does not support it. The dealer has Blackjack roughly 30% of the time when showing an Ace. A bet paying 2:1 needs to win more than 33% of the time to be profitable. Insurance carries a house edge of around 7.4% and should be declined every time.
Even money on your own Blackjack is the same bet framed differently. Decline that too.
Rules That Help You and Rules That Hurt You
Not all blackjack games are equal. These rule variations have a meaningful impact on house edge.
Rules That Lower the House Edge
| Rule | Edge Reduction |
|---|---|
| Blackjack pays 3:2 (vs 6:5) | −1.39% |
| Dealer stands on soft 17 | −0.22% |
| Late surrender available | −0.08% |
| Double after split allowed | −0.14% |
| Re-splitting Aces allowed | −0.08% |
Rules That Raise the House Edge
| Rule | Edge Increase |
|---|---|
| Blackjack pays 6:5 | +1.39% |
| Dealer hits soft 17 | +0.22% |
| Only one split allowed | +0.10% |
| No doubling after split | +0.14% |
| No surrender | +0.08% |
Blackjack Variants
Spanish 21
All ten-spot cards (not face cards) are removed from the deck, reducing it to 48 cards. To compensate, Spanish 21 adds bonus payouts for specific hands: five-card 21s, 6-7-8 and 7-7-7 combinations, and suited versions of those pay increasingly larger amounts. Player Blackjack always beats dealer Blackjack. Despite the removal of tens, the house edge is comparable to standard Blackjack when played with correct strategy, which differs significantly from standard basic strategy.
Double Exposure Blackjack
Both dealer cards are dealt face up. The information advantage is real, but the casino compensates in two ways: all ties lose (except a tied Blackjack, which pushes), and Blackjack pays even money rather than 3:2. Net result: the house edge is similar to or slightly higher than standard Blackjack. The visible hole card changes basic strategy meaningfully.
Blackjack Switch
You play two hands simultaneously and have the option to switch the top cards between them. A powerful rule that benefits players, offset by two adjustments: Blackjack pays even money, and a dealer total of 22 pushes against all player hands except Blackjack. Requires a completely different strategy chart from standard Blackjack.
Best Online Casinos for Blackjack
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| 4 | Super Slots Most variety | 10+ variants, live tables, Switch available | 300 Free Spins on $10+ deposit | ★★★★½ |
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Blackjack Glossary
Blackjack A two-card total of 21 consisting of an Ace and any 10-value card. Pays 3:2 at standard tables.
Bust Going over 21. An automatic loss regardless of what the dealer holds.
Hard Hand A hand with no Ace, or one where the Ace must count as 1 to avoid busting.
Soft Hand A hand containing an Ace currently counted as 11. Cannot bust on the next card because the Ace can drop to 1.
Push A tie between the player and dealer. The bet is returned with no gain or loss.
Double Down Doubling the original bet in exchange for receiving exactly one more card.
Split Dividing a pair into two separate hands, each with its own bet equal to the original.
Surrender Forfeiting the hand and recovering half the original bet. Only available on the initial two cards.
Insurance A side bet offered when the dealer shows an Ace, paying 2:1 if the dealer has Blackjack. Carries a house edge of about 7.4%. Never the correct play.
Hole Card The dealer’s face-down card, not revealed until after all players have acted.
Basic Strategy The mathematically optimal set of playing decisions for every hand combination, based on your total and the dealer’s up card.
Soft 17 An Ace plus 6. Many casinos require the dealer to hit this total, which increases the house edge slightly.
Natural Another term for Blackjack, specifically a two-card 21 on the initial deal.
Shoe The device that holds multiple decks of cards. Most casino and online Blackjack games use 4 to 8 decks.
6:5 Blackjack A version of Blackjack where a natural pays 6:5 instead of 3:2. Adds 1.39% to the house edge. Avoid it.
Frequently Asked Questions
What is the house edge in blackjack?
With perfect basic strategy on a standard 6-deck game where the dealer hits soft 17 and Blackjack pays 3:2, the house edge is approximately 0.5%. Without basic strategy, the average player gives away closer to 2% to 4% on the same game depending on how many mistakes they make. The rules of the specific game also affect the edge, with 6:5 Blackjack adding nearly 1.4% by itself.
Should I always follow basic strategy?
Yes, with no exceptions while playing standard Blackjack. Basic strategy is the mathematically optimal decision for every hand combination given the dealer’s up card. Deviating from it based on gut feeling, streaks, or intuition increases the house edge. The only valid reason to deviate is if you are counting cards and the count justifies a departure, which is a different discipline entirely.
What is card counting and does it work?
Card counting is a technique where a player tracks the ratio of high to low cards remaining in the shoe to determine when the deck is favorable. It works mathematically and gives skilled players a small but real edge of roughly 0.5% to 1.5%. It is not illegal, but casinos will ban players who do it. Online RNG Blackjack reshuffles after every hand, making card counting impossible. Live dealer games reshuffle frequently enough to eliminate most of the advantage.
When should I split pairs?
Always split Aces and 8s regardless of the dealer’s up card. Never split 5s (treat as a 10 and double when appropriate) or 10s (a 20 is too strong to break up). For all other pairs, the correct play depends on the dealer’s up card. The basic strategy chart on this page gives the exact answer for every pair combination.
What is a soft 17 and why does it matter?
A soft 17 is an Ace plus 6, valued at either 7 or 17. When the dealer hits soft 17, it means the dealer draws an additional card in this situation rather than standing. This rule increases the house edge by about 0.22% compared to a dealer who stands on all 17s. It is worth checking before you sit down at any table.
Is online blackjack fair?
At licensed, regulated casinos, yes. RNG Blackjack games are tested by independent auditors (eCOGRA, iTech Labs, GLI) to confirm the cards are dealt from a properly randomized deck. Live dealer Blackjack uses physical cards dealt by a real dealer on camera. The theoretical RTPs listed by reputable casinos reflect the actual math of the game under optimal play.
What is shuffle tracking?
Shuffle tracking is an advanced technique where a player monitors groups of cards through the shuffle process to predict where favorable clusters will appear in the new shoe. It is considerably harder to execute than standard card counting and requires exceptional visual memory and precision. Like card counting, it is not illegal but will result in a casino ban if detected.
