Basic Strategy Calculator
Get instant optimal play recommendations for any blackjack hand combination
What should I do with Hard 15 vs Dealer Ace?
Optimal Play: Surrender
When you have Hard 15 and the dealer shows Ace, the mathematically optimal play according to basic strategy is to surrender. This means you should surrender and forfeit half your bet. If the table does not offer surrender, hit instead.
Why Surrender?
This is one of the most unfavorable situations in blackjack. Surrendering loses only half your bet, while playing the hand loses more on average. Against dealer A with your total of 15, the expected loss is minimized by surrendering.
Expected Value
Surrendering minimizes your losses in this very unfavorable situation. You lose less money on average by giving up half your bet.
Alternative Actions
Alternative actions for this hand against other dealer cards include: Stand, Hit. However, against an Ace, surrender is optimal.
How to Use the Basic Strategy Calculator
Choose Hand Type
Select whether you have a hard hand (no Ace or Ace counted as 1), soft hand (Ace counted as 11), or a pair.
Select Your Hand
Click on the button that represents your hand total or card combination.
Choose Dealer's Upcard
Select the dealer's visible card to complete the scenario.
Get Recommendation
Click "Get Recommendation" to see the optimal play, explanation, and expected value.
Calculator Features
Instant Results
Get immediate optimal play recommendations for any hand combination.
Detailed Explanations
Understand why each decision is optimal with mathematical reasoning.
Expected Value
See the mathematical expectation for each possible action.
Mobile Optimized
Works perfectly on all devices with touch-friendly interface.
Basic Strategy Fundamentals
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: 6 decks, dealer hits soft 17, double on any two cards, double after split allowed, late surrender. See the full basic strategy chart or learn the reasoning in the basic strategy guide.
Action Abbreviations
- H Hit
- Take another card
- S Stand
- Keep your current hand
- D Double
- Double your bet and take one card
- P Split
- Separate pairs into two hands
- R Surrender
- Forfeit half your bet