Play it correctly and blackjack has the lowest house edge of the table games — around 0.5%. Play it on autopilot, or on bad rules, and you give a lot of that back. Here’s how it works.
Basic strategy is simply the best move for every hand-versus-dealer-upcard situation — and it’s the only “strategy” that genuinely helps. A few of its most reliable rules: always split aces and 8s; never split 10s or 5s; stand on hard 17 or more; double a hard 11; and always hit a soft 17 or lower. The full chart covers every case — most online tables even let you check it as you play. It doesn’t make blackjack a winning game; it makes it the least-losing one.
Card counting doesn’t work online: the RNG effectively reshuffles every hand, so there’s no count to keep, and live tables shuffle frequently. Betting systems (Martingale and the rest) don’t change the edge either — see games & odds. And insurance and most side bets carry a much higher edge than the main game, so basic strategy skips them. Whatever you do, the expected result is a loss; blackjack just makes it the smallest one. 18+.
House-edge figures reflect standard blackjack rules and published basic-strategy odds — July 2026. Informational, not advice. 18+.
What is the house edge in blackjack?
With correct basic strategy on standard rules, the house edge is around 0.5% — the lowest of the common table games. Without strategy it's roughly 2% or more, and poor rules (like 6:5 blackjack payouts) push it higher still.
What is basic strategy?
Basic strategy is the mathematically best action (hit, stand, double or split) for every combination of your hand and the dealer's up-card. It doesn't beat the house, but it squeezes the edge down to about 0.5%. Free strategy charts show the correct play for each situation.
Does 3:2 or 6:5 blackjack matter?
A lot. A natural blackjack paying 3:2 is standard; a table paying only 6:5 adds roughly 1.4% to the house edge — a big, hidden cost. Always check the payout printed on the table before you play.
Can you count cards at an online casino?
No. Online blackjack uses a certified random number generator that effectively reshuffles every hand, so there's nothing to count. Live-dealer tables use frequent shuffles and other measures too. Card counting is a live-venue technique, not an online one.