Exact composition-based strategy for one-deck blackjack (the lowest house edge of any variant).
Single-deck blackjack has the lowest house edge in the game — often near zero with the best rules. Because there's only one deck, card removal matters, so our engine uses exact composition-based math (not the infinite-deck approximation used for 4/6/8 decks).
Single deck blackjack is the most player-friendly form of the game. With only 52 cards in play, card removal has a large effect, and with good rules and perfect play the house edge drops close to zero — occasionally even into the player's favour. The chart above is calculated with exact composition-based mathematics for one deck, not the infinite-deck approximation used for larger shoes.
Most of basic strategy is the same across deck counts, but single deck has a handful of unique moves — for example, some doubling and standing decisions change because drawing a specific card meaningfully shifts the remaining deck. Because our engine recomputes the whole chart for one deck, those differences are already built in.
The one thing that can ruin single deck is a 6:5 blackjack payout instead of 3:2. A 6:5 game adds roughly 1.4% to the house edge and wipes out the single-deck advantage entirely. Our charts assume the standard 3:2 payout — always confirm the table pays 3:2 before you sit down.
Drill single-deck decisions in the trainer, compare rules with the house edge calculator, or build a chart for any other game on the main generator.