Blackjack Strategy Calculator

Basic strategy is the mathematically optimal play for every possible hand combination versus every dealer upcard. Following it perfectly reduces the house edge to its minimum — typically 0.5-0.8% depending on table rules.

Dealer hitting soft 17 adds 0.22% to the edge. 6:5 blackjack payout adds 1.39%. No double after split adds 0.14%. Each rule change shifts the edge, and this calculator quantifies the exact impact.

Yes. Basic strategy is the mathematically proven optimal play without card counting. Deviating based on hunches or patterns always increases the house edge over time. The strategy chart accounts for all probabilities.

S17 means the dealer stands on soft 17 (ace + 6). H17 means the dealer hits soft 17, giving the house an extra 0.22% edge because the dealer gets more chances to improve their hand.

6:5 blackjack pays $6 for every $5 bet on a natural, versus $7.50 at 3:2 tables. This single rule change adds 1.39% to the house edge, nearly tripling a good game's advantage for the casino.

Double down on hard 11 against any dealer card, hard 10 against dealer 2-9, and hard 9 against dealer 3-6. On soft hands, double more aggressively against dealer 4-6. The strategy chart shows every specific situation.

Always split aces and 8s. Never split 10s or 5s. Split 2s, 3s, 6s, and 7s against dealer 2-7. Split 4s only against dealer 5-6 with DAS. The strategy varies by rule set.

Practice mode generates random hands and asks you to choose the correct action. It tracks your accuracy percentage and current streak. This is the fastest way to memorize basic strategy for your specific table rules.