ブラックジャックAI戦略計算機
ベーシックストラテジーに基づく最適推奨
テーブルの他プレイヤー数はベーシックストラテジーに影響しません。相手は常にディーラーです。
カードを選択して推奨を表示
ベーシックストラテジー表
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セルをクリックして推奨アクションを変更できます。変更は自動保存されます。
Disclaimer: This calculator is provided for educational and entertainment purposes only. Gambling involves risk and you should never bet more than you can afford to lose. We are not responsible for any financial losses incurred while using this tool or following its recommendations. Past performance and statistical probabilities do not guarantee future results. Please gamble responsibly.
How to Use the Blackjack Strategy Calculator
This free blackjack basic strategy calculator helps you make mathematically optimal decisions at the table. Get instant recommendations and customize the strategy chart to match your playing style.
- Select your two cards by clicking on the card picker
- Choose the dealer's face-up card
- View the recommended action (Hit, Stand, Double, Split, or Surrender)
- Check win/lose/push probabilities based on Monte Carlo simulation
- Optionally customize the strategy chart - your changes are saved automatically
Understanding Basic Strategy
What is Basic Strategy?
Basic strategy is the mathematically optimal way to play every hand in blackjack. It reduces the house edge to around 0.5% when followed correctly. This calculator uses the standard 4-8 deck strategy with common casino rules.
Hard vs Soft Hands
A "hard" hand has no Ace counting as 11, while a "soft" hand includes an Ace that can be counted as 11 without busting. Soft hands give you more flexibility since you can't bust with one more card.
When to Double Down
Doubling down lets you double your bet in exchange for one more card. Basic strategy recommends doubling on totals of 9, 10, or 11 against weak dealer cards, maximizing your advantage in favorable situations.
When to Split Pairs
Always split Aces and 8s. Never split 10s or 5s. Other pairs depend on the dealer's up card. Splitting creates two hands from one, potentially doubling your winning opportunities.
Customizing Your Strategy
The strategy chart is fully editable. Click any cell to change the recommended action. This lets you:
- Adjust for specific casino rules (dealer hits/stands on soft 17)
- Practice with a more conservative or aggressive approach
- Account for surrender rules at your casino
- Create a custom strategy based on card counting deviations
Your customizations are saved automatically in your browser. Use the "Reset to Default" button to restore the standard basic strategy.
Record your results and analyze your performance over time