Blackjack has the best odds of any casino table game — but only if you play correctly. With perfect basic strategy, the house edge drops to around 0.5%. Without it, the average player gives up 2–4% through bad decisions. This page covers the real numbers: bust probabilities, dealer bust rates, house edge by playing style, and what card counting actually does to the math.
The house edge is the percentage of each bet the casino keeps on average over the long run. In blackjack, how you play has more impact on this number than almost any other casino game.
| Playing style | House edge | What this means |
|---|---|---|
| No strategy (gut feel) | 2–4% | Losing $2–4 per $100 bet on average |
| Basic strategy (memorized) | ~0.5% | Losing about $0.50 per $100 bet |
| Basic strategy + Hi-Lo counting | −0.5 to −1.5% | Player advantage — winning $0.50–1.50 per $100 bet long-run |
Assumes 6-deck game, dealer stands on soft 17, double after split allowed, late surrender allowed. Rule variations (H17, single deck, no surrender) shift the edge by up to 0.3%.
People often think blackjack is close to 50/50. It is close — but the small edges matter across thousands of hands.
Pushes return your bet, so the effective loss rate is lower than the dealer win percentage suggests. The 5–7% gap between dealer wins and player wins is where the house edge lives. Blackjacks (paying 3:2) partially close that gap in the player's favor.
A natural blackjack requires an ace and a ten-value card (10, J, Q, K) as your first two cards. In a 6-deck shoe, there are 24 aces and 96 ten-value cards out of 312 total cards.
The 3:2 blackjack payout is worth about 2.3% to the player over the long run. Tables that pay 6:5 instead effectively give that back to the house. Never play 6:5 blackjack — it nearly triples the house edge compared to a 3:2 game with basic strategy.
When deciding whether to hit a stiff hand, the bust probability tells you how likely you are to go over 21 on the next card. This is why basic strategy says to stand on hard 13–16 against weak dealer upcards — the risk of busting is too high relative to the chance the dealer busts on their own.
These are single-deck approximations. In a multi-deck shoe the probabilities are nearly identical because the card composition shifts only slightly.
The dealer must hit until reaching 17 or more, which means certain upcards are much more likely to produce a bust. Cards 4, 5, and 6 are the weakest dealer upcards — this is why basic strategy is more aggressive about doubling and standing against them.
The sharp drop from dealer 6 to dealer 7 is one of the most important inflection points in blackjack strategy. Against 2–6, standing on stiff hands and letting the dealer bust is often correct. Against 7+, the dealer is unlikely to bust and you must try to improve your hand.
Card counting does not change the odds of any individual hand. What it does is identify when the remaining shoe is disproportionately rich in high cards (tens and aces), which mathematically favors the player in two ways:
| True count | Player edge | Action |
|---|---|---|
| −2 or lower | −1.5% or worse | Bet minimum |
| −1 | −1.0% | Bet minimum |
| 0 | −0.5% | Bet minimum |
| +1 | 0% (breakeven) | Bet minimum |
| +2 | +0.5% | 2× base bet |
| +3 | +1.0% | 4× base bet |
| +4 | +1.5% | 8× base bet |
| +5+ | +2.0%+ | 8× base bet (max) |
Each true count point is worth approximately 0.5%. House starts at −0.5% at TC 0 with basic strategy. Player breaks even at TC +1, gains edge at TC +2 and above.
Not all blackjack games are equal. Rule variations can shift the house edge significantly. Always check the rules before sitting down.
The single most important rule to avoid: 6:5 blackjack payouts. A table offering 6:5 on blackjack is 4–5× worse than a 3:2 table with basic strategy. Walk away.
The Blackjack GTO trainer tracks your running count and true count in real time, shows you your mistake rate, and explains every wrong decision. The best way to understand these odds is to practice until basic strategy is automatic.
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