Short answer: basic strategy is a fixed set of decisions (hit, stand, double, split, or surrender) for every combination of your hand and the dealer’s face-up card. It comes from probability math, later confirmed by computer simulation, and using it brings the house edge in blackjack down to roughly 0.5% under good table rules. It won’t make you a winner over time, but it makes blackjack one of the cheapest games to play at a licensed online casino. Here’s how to learn it without memorizing a wall of colored squares.
Check the table rules before you sit down
Basic strategy assumes certain rules. Online blackjack tables at state-licensed casinos in New Jersey, Pennsylvania, Michigan, and the other legal states show their rules in the game’s help or info screen. Read it first, because some rule changes cost you far more than any playing mistake.
| Rule | Version that helps you | Version that hurts you | How much it matters |
|---|---|---|---|
| Blackjack payout | 3:2 (a $10 bet pays $15) | 6:5 (a $10 bet pays $12) | Big: 6:5 adds about 1.4% to the house edge |
| Dealer on soft 17 | Dealer stands (S17) | Dealer hits (H17) | Small but real |
| Double after split | Allowed (DAS) | Not allowed | Small |
| Surrender | Late surrender offered | No surrender | Small |
| Number of decks | Fewer decks | More decks | Small |
The first row is the one to never compromise on. A 6:5 table quietly costs you more than all the other rule differences put together, so if you see it, find a 3:2 table instead. The charts below assume a multi-deck game where the dealer stands on soft 17, doubling after a split is allowed, and late surrender is offered.
Learn the hard totals first
A hard hand has no ace, or an ace that must count as 1. These come up most, so they’re the best place to start. Think of the dealer’s upcard in two groups: 2 through 6 are weak cards (the dealer is more likely to bust), and 7 through ace are strong ones.
| Your hard total | Dealer shows 2-6 | Dealer shows 7-A | Exceptions to remember |
|---|---|---|---|
| 8 or less | Hit | Hit | None |
| 9 | Double vs 3-6, hit vs 2 | Hit | None |
| 10 | Double | Double vs 7-9, hit vs 10 or A | None |
| 11 | Double | Double vs 7-10, hit vs A | Many charts double vs A when the dealer hits soft 17 |
| 12 | Stand vs 4-6, hit vs 2-3 | Hit | None |
| 13-16 | Stand | Hit | Surrender 16 vs 9, 10, A and 15 vs 10 if allowed |
| 17 or more | Stand | Stand | None |
The hand that feels worst is hard 16 against a dealer 10. Hitting will often bust you, but standing loses more often, because the dealer only needs to reach 17. If late surrender is available, giving up half your bet is the better choice there.
Play soft hands more aggressively
A soft hand contains an ace counted as 11, such as ace-6 (soft 17). You can’t bust by taking one card, which is why basic strategy doubles more often here.
- Ace-2 and ace-3: double against a dealer 5 or 6, otherwise hit.
- Ace-4 and ace-5: double against 4 through 6, otherwise hit.
- Ace-6: double against 3 through 6, otherwise hit. Never stand on soft 17.
- Ace-7: double against 3 through 6, stand against 2, 7, or 8, and hit against 9, 10, or ace.
- Ace-8 and ace-9: stand.
When doubling isn’t allowed (for example, on a hand of three or more cards), hit the hands where the chart says double, except soft 18, where you stand.
Split the right pairs, and only those
Pairs give you the choice to split into two hands, each with a bet equal to the first. Two rules cover most situations: always split aces and 8s, never split 10s or 5s.
- Aces: always split. Two hands starting at 11 beat one soft 12.
- 8s: always split. A hard 16 is the worst total in the game.
- 10s: never split. A 20 already wins most hands.
- 5s: never split. Play them as a hard 10.
- 2s and 3s: split against 2 through 7.
- 4s: split only against 5 or 6.
- 6s: split against 2 through 6.
- 7s: split against 2 through 7.
- 9s: split against 2 through 6, 8, and 9. Stand against 7, 10, or ace.
These pair rules assume doubling after a split is allowed. Without it, you split small pairs a bit less often.
Handle the hands that feel wrong
A few basic strategy plays go against gut instinct. Knowing why they’re right makes them easier to stick with.
- Hit 12 against a dealer 2 or 3. The dealer’s 2 and 3 are weaker than face cards but not weak enough. Only 4, 5, and 6 justify standing on 12.
- Stand on 13 against a dealer 2. Many players hit here. Standing is the better play because the dealer’s 2 still busts often enough.
- Hit soft 18 against a 9, 10, or ace. Eighteen feels like a winning hand, but against those cards it loses more often than it wins, and you can’t bust with one more card.
- Hit a multi-card 16 against a 10 when surrender isn’t offered. Some advanced charts make small exceptions for three-card hands, but for a basic strategy player, hitting is the standard play.
- Double 11 against a 10. It looks risky to double against a strong card. Under the rules assumed here, the math still favors it.
Every one of these plays will lose plenty of individual hands. Basic strategy is about which choice loses least across thousands of them, not about what happens this time.
Leave insurance and side bets alone
When the dealer shows an ace, you’ll be offered insurance: a side bet that pays 2:1 if the dealer has blackjack. It isn’t protection; it’s a separate wager, and basic strategy says decline it every time. Most side bets on modern blackjack tables (pairs, poker-hand combos, and similar) typically carry a much higher house edge than the main game. If they’re fun for you, keep them small and count them as entertainment spend.
No strategy beats the edge long term. Basic strategy reduces losses, it doesn’t reverse them. Betting systems that raise your stake after losses only change the size of your swings. RNG blackjack typically deals from a freshly shuffled virtual deck each hand, so card counting is not a realistic plan online.
Practice in chunks, not all at once
Trying to memorize every cell at once is the fastest way to give up. A better order:
- Week one: hard totals only. They cover most hands.
- Week two: the two pair rules (always aces and 8s, never 10s and 5s), then the rest of the pairs.
- Week three: soft hands.
- Keep a chart open while you play online. Nobody at a virtual table can see your second screen.
Some licensed operators also offer free-play or demo versions of their blackjack games, which let you drill the decisions without staking anything.
Compare blackjack with other table games
Basic strategy is what makes blackjack a low-edge game. Without it, a typical player gives up much more. For context, here’s how well-played blackjack compares with other standard casino bets using published house-edge math:
- Blackjack, basic strategy, good rules: roughly 0.5%
- Baccarat banker bet (with 5% commission): 1.06%
- Craps pass line: 1.41%
- Single-zero roulette: 2.70%. Our roulette odds guide has the full table.
Low edge also makes blackjack attractive for clearing bonuses, but many operators weight table games down for that reason. Our wagering requirements guide shows how to check.
Your blackjack checklist
- Confirm you’re 21+ and physically inside a legal online casino state.
- Open the table’s rules and confirm blackjack pays 3:2.
- Prefer tables where the dealer stands on soft 17 and doubling after split is allowed.
- Learn hard totals first, then pairs, then soft hands.
- Decline insurance every time.
- Set a session budget and a deposit limit before you play (see how deposit limits work).
Blackjack is still gambling, with a house edge on every hand. If it stops being fun, call or text 1-800-GAMBLER, or visit our responsible gambling page. Availability and legality vary by state.