Get instant optimal play recommendations for any blackjack hand combination
When you have Hard 10 and the dealer shows 5, the mathematically optimal play according to basic strategy is to double down. This means you should double your bet and take exactly one more card.
This is a favorable situation where doubling your bet maximizes your expected profit. With 10, you have excellent chances of reaching a total of 17-20. The dealer's 5 makes this an opportune moment to increase your wager.
Select whether you have a hard hand (no Ace or Ace counted as 1), soft hand (Ace counted as 11), or a pair.
Click on the button that represents your hand total or card combination.
Select the dealer's visible card to complete the scenario.
Click "Get Recommendation" to see the optimal play, explanation, and expected value.
Get immediate optimal play recommendations for any hand combination.
Understand why each decision is optimal with mathematical reasoning.
See the mathematical expectation for each possible action.
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Basic strategy is the mathematically optimal way to play every hand in blackjack. It's based on computer simulations of millions of hands and reduces the house edge to its minimum. This calculator implements perfect basic strategy for standard rules.