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Single-deck vs multi-deck blackjack: which has the lower house edge?
Fewer decks mean a lower house edge — single deck shaves roughly 0.15% off versus an eight-deck shoe. So single-deck looks like the obvious winner. The catch: most single-deck tables now pay 6:5 on a blackjack instead of 3:2, and that single rule change costs you about 1.4% — far more than the deck advantage was ever worth. Here's the real breakdown.
Blog · Variant comparisonDeck edge: ~0.15% in single's favour6:5 payout penalty: ~1.4%Payout matters more than decks
Single-deck blackjack has a reputation as the purist's choice, and on the surface the logic is sound: the fewer decks in play, the lower the house edge. But the number of decks is only one input into the math. The blackjack payout — 3:2 versus 6:5 — is a far bigger lever, and it's the one most single-deck tables quietly pull against you. We'll separate the two effects and show you which table actually preserves your bankroll best.
Key differences at a glance
The headline numbers, assuming otherwise-identical rules. Read on for the math that produces them.
| Property | Single deck (6:5) | Multi-deck (3:2) |
|---|---|---|
| Blackjack payout | 6:5 | 3:2 |
| Decks in play | 1 | 6–8 |
| Deck-count effect | ~0.15% better | baseline |
| Payout effect | ~1.40% worse | baseline |
| Net house edge | higher (~1.5%) | lower (~0.5%) |
| Better for bankroll | — | yes |
Why fewer decks help
With fewer cards in play, drawing a ten or an ace becomes slightly more likely to land where it helps you, and the swings work marginally in the player's favour. A single deck with the same rules as an eight-deck shoe lowers the house edge by roughly 0.15 percentage points. That's a real edge — it's why card counters historically loved single- and double-deck games. But on its own it's small, and casinos know exactly how to claw it back.
The 6:5 payout trap
A natural blackjack — an ace plus any ten-value card on your first two cards — is the best hand in the game. The fair, traditional payout is 3:2: bet $10, win $15. Many single-deck tables now pay only 6:5: bet $10, win just $12. You hit a blackjack roughly once every 21 hands, and over a session that missing $3 per natural adds up fast. Switching a table from 3:2 to 6:5 adds about 1.4 percentage points to the house edge — nearly ten times the size of the deck advantage you were chasing.
Blackjack payout: 3:2 vs 6:5
What a winning natural pays on common bet sizes.
| Your bet | Pays at 3:2 | Pays at 6:5 | You lose |
|---|---|---|---|
| $10 | $15 | $12 | $3 |
| $25 | $37.50 | $30 | $7.50 |
| $50 | $75 | $60 | $15 |
| $100 | $150 | $120 | $30 |
| $200 | $300 | $240 | $60 |
House edge: putting it together
Start with a typical multi-deck game on good rules — six or eight decks, dealer stands on soft 17, double after split allowed, blackjack pays 3:2. That sits near a 0.5% house edge.
Single deck, 3:2 payout: this is the genuinely best version — drop the deck count and keep the fair payout and the edge can fall under 0.2%. The problem is these tables are now rare, especially online.
Single deck, 6:5 payout: take that same single-deck game and switch the natural to 6:5, and the edge jumps to roughly 1.5% — three times worse than the 3:2 multi-deck table. The deck advantage is real but tiny; the payout penalty dwarfs it.
In other words: a 6:5 single-deck table is one of the worst common blackjack bets on the floor, despite the 'single deck' label that's meant to sound premium.
What to check before you sit down
Always read the table felt and the game info panel before betting. The payout line is the single most important number: if it says 'Blackjack pays 6 to 5', walk away — even a six- or eight-deck 3:2 table beats it comfortably. After payout, the rules that matter most are whether the dealer stands or hits on soft 17, whether you can double after splitting, and how many splits are allowed. Our /rules/ guide breaks down each one, and the /strategies/ hub shows how correct basic strategy changes the edge further.
Why 6:5 single-deck tables exist
Casinos love marketing a single-deck game because experienced players associate single deck with a low house edge. The 6:5 payout is the quiet trade-off that makes it profitable for the house — most casual players never notice the payout line, only the 'single deck' sign. It's the same psychology that sells worse odds under a better-sounding label. Knowing to check the payout is the single biggest skill edge a recreational player can have.
Quick FAQ
If I can choose, which table should I pick?
Pick the 3:2 table every time, regardless of deck count. A six- or eight-deck shoe paying 3:2 has a far lower house edge (~0.5%) than a single deck paying 6:5 (~1.5%). Only choose single deck if it also pays 3:2 — that's the best game in the house, but it's increasingly rare.
How much does the 6:5 payout actually cost me?
Roughly 1.4 percentage points of house edge. On a winning natural you collect $12 per $10 instead of $15 — losing $3 every time you hit blackjack, which happens about once every 21 hands. Over a session that's a steady, invisible drain.
Is single-deck always worth seeking out?
Only at 3:2. A 3:2 single-deck game is the lowest-edge blackjack you'll find. A 6:5 single-deck game is a trap — the fewer-decks math gains you about 0.15%, but the payout change costs about 1.4%, so you end up far worse off than at a standard multi-deck 3:2 table.