Blackjack Basic Strategy Explained Simply

Blackjack is unique among card games in that the correct decision for each hand can be calculated mathematically. Basic strategy is the result of that calculation — a complete set of rules for when to hit, stand, double down, or split, based on your hand value and the dealer's visible card.

Players who follow basic strategy reduce the house edge to approximately 0.5%. Players who play by feel typically face a house edge of 2–4%. That difference compounds over many hands.

The Objective

The goal is not to reach 21 — it is to beat the dealer without going over 21. This distinction matters because it changes many decisions. You are not playing against 21; you are playing against the dealer's hand.

When to Stand

Hard 17 or higher — always stand, regardless of dealer upcard
Hard 13–16 — stand when dealer shows 2–6 (bust cards); hit when dealer shows 7–Ace
Hard 12 — stand when dealer shows 4–6; hit otherwise
Soft 18 (Ace + 7) — stand when dealer shows 2, 7, or 8; hit or double when dealer shows 9, 10, or Ace

When to Hit

Hard 11 or lower — always hit (consider doubling at 9, 10, or 11)
Hard 12–16 when dealer shows 7 or higher — the dealer is unlikely to bust, so you need to improve your hand
Soft 17 or lower (Ace + 6 or less) — hit or double; an Ace still provides safety against busting

When to Double Down

Doubling down doubles your bet and commits you to exactly one more card. The goal is to do this when you are likely to win and maximise your payout.

Hard 11 — double against any dealer upcard except an Ace
Hard 10 — double when dealer shows 2–9
Hard 9 — double when dealer shows 3–6
Soft 13–18 (Ace + 2 through Ace + 7) — various doubling opportunities against dealer bust cards

When to Split

Splitting creates two separate hands from a pair. Always split high-value pairs; never split low-value pairs that form a strong hand.

Always split: Aces and 8s
Never split: 10s (you already have 20), 5s (you have 10, great for doubling)
Split 9s against dealer 2–6, 8–9; stand against dealer 7, 10, or Ace
Split 7s against dealer 2–7
Split 6s against dealer 2–6
Split 4s only against dealer 5–6 (otherwise hit)
Split 2s and 3s against dealer 2–7

The Most Important Rule

Never take insurance. The insurance side bet has a house edge of approximately 7.7% in a standard game. No matter what cards you hold, declining insurance is the correct play according to basic strategy.

Frequently Asked Questions

Does basic strategy guarantee winning?

No. Basic strategy minimises the house edge to roughly 0.5%, but the house still has a mathematical advantage. Basic strategy tells you the statistically best decision for each hand — it does not eliminate variance or guarantee short-term profit.

Should I take insurance?

No. Insurance is a side bet with a house edge of around 7%. Basic strategy consistently recommends declining insurance regardless of your hand. The only exception is if you are card counting and have determined the deck is rich in tens.

What does "the dealer busts approximately 28% of the time" mean in practice?

When the dealer shows a bust card (2–6), standing on a weak hand (12–16) is often correct because the dealer is likely to bust without you needing to risk a bust yourself. Taking this into account is why basic strategy sometimes tells you to stand on hands that feel uncomfortable.

Is blackjack skill or luck?

Both. The cards are random, so luck always plays a role. However, decisions significantly affect expected outcomes. A player using basic strategy faces a house edge of ~0.5%. A player making poor decisions faces a house edge of 2–4%. Over many hands, that difference is substantial.