Welcome to the internet's authoritative encyclopedia and free playable simulator for the world's #1 casino card game. Experience authentic Las Vegas 3:2 payouts, S17 dealer mandates, basic strategy charts, dealer bust odds, and multi-seat table play with zero download.
Select your chip denomination ($1, $5, $25, $100, $500) and place your bet onto the designated table circle before cards are drawn from the shoe.
The dealer deals two cards face-up to each active seat. The dealer receives one card face-up (upcard) and one card face-down (hole card).
Evaluate your hand against the dealer upcard. Choose to Hit (take another card), Stand (hold current total), Double Down (double bet for one card), or Split (divide pairs).
Once all players finish, the dealer exposes the hole card. If the dealer has 16 or less, they must draw until reaching 17+. Higher valid total wins; ties push.
Comparing the mathematical house edge, skill requirement, and payout structure across premier casino table games.
| Casino Game | House Edge (Optimal) | Skill Factor | Top Payout | Beatability |
|---|---|---|---|---|
| Blackjack (Vegas S17) | ~0.36% – 0.50% | Very High (Basic Strategy) | 3 : 2 Natural | Beat via Card Counting |
| Spanish 21 | ~0.40% – 0.76% | High (No 10s Strategy) | Bonus 21 Tables | Match the Dealer Edge |
| Baccarat (Banker Bet) | 1.06% | Low (Betting Choice Only) | 1 : 1 (-5% commission) | Fixed House Hold |
| Craps (Pass Line + Odds) | ~0.42% – 1.41% | Medium (Bet Selection) | True Odds Multipliers | Unbeatable Long-Term |
| European Roulette (Single 0) | 2.70% | Zero (Pure Chance) | 35 : 1 Straight Up | Mathematically Fixed |
| American Roulette (0 + 00) | 5.26% | Zero (Pure Chance) | 35 : 1 Straight Up | Predatory Hold |
Your tactical decision to hit or stand is strictly dictated by the dealer's bust probability.
Hit hard 12; stand on hard 13+.
Double on 9, 10, 11; stand on 13+.
Weak card. Stand on stiff 12–16.
High bust risk. Double soft hands.
Weakest dealer card. Double max.
Dealer Pat hand. Hit 12–16.
Strong card. Must hit to 17.
Aggressive dealer card. Hit 16.
Lowest bust rate. Surrender 15/16.
Deadliest card. Decline insurance.
Insurance pays 2 to 1 against a dealer Ace holding a 10 in the hole. In a standard multi-deck shoe, only 16 out of 52 cards (30.77%) equal 10. The insurance bet carries an egregious house edge of 5.88% to 7.40%. Mathematically decline insurance on every hand unless you are a card counter tracking a True Count of +3 or higher.
A pair of 8s totals 16—the statistically worst hand in blackjack. Splitting 8s creates two separate hands starting with an 8, offering a strong chance to draw into two 18s. Splitting Aces gives you two hands starting with 11, each having a 30.8% probability of receiving a 10 for 21. Never split 10s or 5s.
Hard 11 gives you the highest positive expected value (EV) in blackjack. Always double your wager against any dealer upcard from 2 through 10. Under S17 rules, double 11 even against a dealer Ace.
When holding a "stiff" hand (12 through 16), hitting risks busting over 30% to 62% of the time. When the dealer shows a 4, 5, or 6, their bust rate exceeds 40%. Stand and let the dealer draw cards until they bust.
On a traditional 3:2 table, a $10 natural pays $15. On a predatory 6:5 table, that same natural pays only $12. This single rule change increases the house edge by +1.39%, virtually eliminating any mathematical chance of long-term profitability. Our free simulator strictly utilizes authentic 3:2 tables.
The exact mathematical decision matrices calculated to minimize casino house edge to 0.36%.
| Player Hard Hand | Dealer Upcard 2–3 | Dealer Upcard 4–6 | Dealer Upcard 7–8 | Dealer Upcard 9–10 | Dealer Upcard Ace |
|---|---|---|---|---|---|
| Hard 17–21 | STAND | STAND | STAND | STAND | STAND |
| Hard 16 | STAND | STAND | HIT | SURRENDER / HIT | SURRENDER / HIT |
| Hard 15 | STAND | STAND | HIT | SURRENDER / HIT | HIT |
| Hard 13–14 | STAND | STAND | HIT | HIT | HIT |
| Hard 12 | HIT | STAND | HIT | HIT | HIT |
| Hard 11 | DOUBLE | DOUBLE | DOUBLE | DOUBLE | DOUBLE (S17) / HIT |
| Hard 10 | DOUBLE | DOUBLE | DOUBLE | HIT | HIT |
| Hard 9 | HIT | DOUBLE | HIT | HIT | HIT |
| Hard 5–8 | HIT | HIT | HIT | HIT | HIT |
| Player Soft Hand | Dealer 2–3 | Dealer 4 | Dealer 5–6 | Dealer 7–8 | Dealer 9–A |
|---|---|---|---|---|---|
| Soft 20 (A,9) | STAND | STAND | STAND | STAND | STAND |
| Soft 19 (A,8) | STAND | STAND | DOUBLE / STAND | STAND | STAND |
| Soft 18 (A,7) | DOUBLE / STAND | DOUBLE | DOUBLE | STAND | HIT |
| Soft 17 (A,6) | HIT | DOUBLE | DOUBLE | HIT | HIT |
| Soft 15–16 (A,4–A,5) | HIT | DOUBLE | DOUBLE | HIT | HIT |
| Soft 13–14 (A,2–A,3) | HIT | HIT | DOUBLE | HIT | HIT |
Always split Aces (creating two 11s) and 8s (breaking up the worst total of 16 into two 8s) against every dealer card.
Never split 10s (locking in a winning 20) or 5s (total 10 provides a powerful double down opportunity instead).
Split 9s against dealer 2 through 6, 8, and 9. Stand against 7 (your 18 beats dealer 17) and stand against 10 or Ace.
Split 7s against dealer 2 through 7. Hit 7s against dealer 8 through Ace.
Split 6s against dealer bust cards 2 through 6. Hit 6s against 7 through Ace.
Split 2s and 3s vs dealer 2–7 (with Double After Split). Split 4s only vs dealer 5 or 6 if DAS is permitted; otherwise hit.
The earliest documented mention of blackjack traces back to the Spanish author Miguel de Cervantes (author of Don Quixote) in his 1601 novella Rinconete y Cortadillo. Cervantes described card cheats in Seville playing veintiuna (Spanish for twenty-one), stating that the objective was to reach 21 points without busting, and that the Ace was valued at 1 or 11.
During the 18th century, the game migrated to France under the name Vingt-et-Un, where it was played in royal gambling salons, including private card rooms favored by Napoleon Bonaparte. In the 19th century, French emigrants brought Vingt-et-Un to New Orleans, spreading it along the Mississippi riverboat gambling circuits.
When gambling was legalized in Nevada in 1931, casino operators needed promotional incentives to attract table players from craps and roulette. Casinos offered a special 10-to-1 payout bonus if the player’s winning two-card 21 consisted of the Ace of Spades paired with a black Jack (either the Jack of Spades or the Jack of Clubs). Although this bonus was later removed and replaced with standard 3:2 payouts, the moniker "Blackjack" permanently stuck to the card game worldwide.
In 1956, four US Army engineers (Roger Baldwin, Wilbert Cantey, Herbert Maisel, and James McDermott)—known as The Four Horsemen of Aberdeen—published the first mathematically proven basic strategy using primitive desk calculators. In 1962, MIT mathematics professor Dr. Edward O. Thorp utilized an IBM 704 mainframe to formulate the Ten-Count and published Beat the Dealer, proving that blackjack could be systematically conquered through card counting.
Even when playing with perfect basic strategy, blackjack experiences short-term statistical variance. Without disciplined bankroll sizing, standard deviation will eventually result in the gambler's ruin.
Always maintain at least 40 to 50 minimum table betting units for a single playing session to comfortably absorb variance swings without exhausting funds.
For card counters and advantage players, maintain 500 to 1,000 maximum bet units to keep Risk of Ruin (RoR) strictly below 1.0%.
Professional teams utilize "Half-Kelly" (wager f* / 2) to capture 75% of maximum growth rate while reducing drawdown variance by 50%.
The last player seat to the immediate right of the dealer who acts just before the dealer plays.
The total dedicated sum of money set aside exclusively for playing blackjack.
When a player or dealer hand exceeds 21 points, resulting in an automatic loss.
An automated card shuffler that recycles used cards after each round, making card counting impossible.
A player-favorable rule permitting doubling down on hands created immediately after splitting a pair.
Surrendering half your bet before the dealer checks for a natural blackjack (lowers house edge by 0.63%).
A hand containing no Aces, or Aces that can only be counted as 1 without causing the hand to bust.
The dealer's face-down second card that remains concealed until all player actions conclude.
An opening two-card hand containing an Ace and any 10-value card (10, Jack, Queen, King).
A tie between the player and dealer where the player's original wager is returned in full.
A hand containing an Ace that can be counted as 11 without exceeding 21 (e.g. Ace-6 = Soft 17).
The Running Count divided by the estimated number of decks remaining in the shoe.
Blackjack is a casino banking card game where each player aims to beat the dealer by achieving a hand total as close to 21 as possible without exceeding it. Cards 2 to 10 are face value, face cards equal 10, and Aces count as 1 or 11.
Yes. Unlike roulette or slot machines where every outcome is independent, blackjack possesses "dependent trials"—cards dealt from the shoe change the odds of future hands. Mastering basic strategy drops the casino edge to ~0.5%, and card counting with bet spreads can yield a player edge of +1.0% to +2.0%.
No. Under federal and state laws across the United States and Europe, card counting using only your mind is 100% legal. However, private casinos reserve the right to ban or "back off" players they suspect of counting cards.
