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.
Number cards (2–10) are face value. Face cards (J, Q, K) are worth 10. An ace counts as 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). You can’t bust on the next card because the ace can switch to 1.
Place your bet. Get two cards face up. The dealer gets one face up (the upcard) and one face down (the hole card). If your first two cards total 21 — that’s a blackjack. You win at 3:2 unless the dealer also has one (push). Otherwise, make your decisions, then the dealer plays by fixed rules.
Hit (take a card), Stand (keep your hand), Double Down (double your bet, one more card), Split (divide matching cards into two hands), or Surrender (forfeit half your bet). These choices genuinely affect the outcome — unlike most casino games, your decisions matter.
The dealer has no choices. Hit on 16 or below, always. Stand on 17 or above, always. No doubling, no splitting, no surrender. The dealer follows a fixed script. The dealer busts about 28% of the time — and that’s built into the math you can exploit with basic strategy.
Your main wager on the hand. Pays 1:1 (even money). With basic strategy, the house edge is about 0.5% — the lowest of any table game. Without basic strategy, the edge climbs to 2% or more. That gap is the single biggest variable in blackjack.
A natural blackjack pays 3:2 at standard tables (or 6:5 at some — avoid these). Insurance is a side bet that the dealer has blackjack; it pays 2:1 but carries a ~7.7% house edge. Other side bets (Perfect Pairs, 21+3) carry edges of 2–11%+. Basic strategy says: skip them all.
Some tables pay 6:5 on a natural blackjack instead of 3:2. On a $10 bet, that’s $12 instead of $15. Three dollars less per blackjack. This single rule change increases the house edge by about 1.4%. Check the table sign before you sit down — it’s the most important number in the room.
With basic strategy and favorable rules (3:2, stand on soft 17, 6 decks), the house edge is about 0.5%. Standard rules push it to 0.6–0.8%. Without basic strategy, 2–2.5%. A 6:5 table with basic strategy is 1.5–2%. Learning basic strategy is the single most impactful thing you can do.
With basic strategy at a standard table, for every $100 you bet over time, you’d lose about 50 cents on average. Without basic strategy, $2–$2.50 per $100. The strategy takes about 20 minutes to learn. That’s the best return on time investment in gambling.
The dealer must hit on 16 or below — no choice. This means the dealer busts about 28% of the time. Your advantage: you decide when to stop. Basic strategy exploits this asymmetry by telling you exactly when to stand (let the dealer bust) and when to hit (improve your hand).
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.
8 or less: always hit. 9–11: double against weak dealer (2–6), hit against strong (7–A). 12–16: stand against weak dealer, hit against strong. 17+: always stand. The key insight: stand when the dealer is likely to bust, hit when the dealer is likely to make a hand.
Always split Aces and 8s. Never split 10s or 5s. Split other pairs against weak dealer upcards (2–6), hit against strong ones (7+). Splitting aces gives you two chances at 21. Splitting 8s turns a bad 16 into two playable hands. Splitting 10s turns a great hand into two mediocre ones.
Learn basic strategy. It takes about 20 minutes, cuts the house edge in half, and the charts are free everywhere. It’s the single most impactful thing you can do at a blackjack table. No other casino game gives you this much control over the house edge through informed decisions.
The Martingale system — double after every loss to "guarantee" a win — doesn’t change the house edge. After 7 consecutive losses at $5, you’re down $635 chasing a $5 profit. You’ll hit the table limit or your budget long before the math rescues you. No betting pattern changes the underlying odds.
The person next to you making a "bad" play doesn’t affect your odds. Each hand plays against the dealer independently. And card counting? It’s real but offers a tiny edge (0.5–1.5%), requires massive effort, and casinos use 6–8 decks plus frequent shuffles to neutralize it. Not the cheat code movies suggest.
3 questions. See if the guide stuck.
What is the house edge on blackjack when you use basic strategy?
The dealer’s upcard is an ace and you’re offered insurance. What does basic strategy say?
A table pays 6:5 on a natural blackjack instead of 3:2. On a $10 bet, how much less do you win?
Basic strategy. 20 minutes. The best odds in the casino. No fine print.
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