How to Use This Blackjack Strategy Calculator
This tool gives you the mathematically correct play for any blackjack hand in three steps. First, click the rank buttons under "Your Hand" to add your cards — you can add up to seven. Second, click a rank under "Dealer Upcard" to set the card the dealer is showing. Third, read the recommendation box, which instantly tells you whether to Hit, Stand, Double Down, Split, or Surrender, along with the reason why.
The full strategy chart below the advisor is split into three tabs: Hard Totals, Soft Totals, and Pairs. Switch between them to study the complete decision matrix. Each cell shows the correct action against every possible dealer upcard from 2 through Ace. If you want to practise a specific scenario, just change your cards or the upcard and the advisor updates immediately.
What Is Blackjack Basic Strategy?
Basic strategy is a set of mathematically proven decisions for every possible blackjack hand versus every possible dealer upcard. It was developed in the 1950s by mathematicians using computer simulations of billions of hands. The strategy assumes a specific set of rules — in this case, 4–8 decks with the dealer standing on soft 17 — and tells you the play that results in the lowest expected loss over time.
Playing perfect basic strategy reduces the house edge to roughly 0.4–0.5% depending on the exact table rules. That makes blackjack one of the lowest house-edge games in any casino, land-based or online. Without basic strategy, most players give the house an extra 1.5–2% edge simply through suboptimal decisions like standing on a 16 against a dealer 7 or not doubling an 11 against a dealer 6.
Basic strategy does not guarantee a win on any individual hand — no strategy can. What it does is minimise expected losses mathematically. Over a long enough session, every deviation from basic strategy costs real money.
Understanding the Action Types
| Action |
What It Means |
When to Use It |
| Hit (H) | Take another card from the dealer. | Your hand is weak or the dealer shows a strong upcard (7–Ace). |
| Stand (S) | Take no more cards and play out your current total. | Your hand is strong enough to let the dealer risk busting. |
| Double Down (D) | Double your bet and receive exactly one more card. | You have a strong positional advantage — typically 9, 10, or 11 against a weak dealer card. |
| Double (else Stand) (Ds) | Double down if allowed; otherwise stand. | Soft hands like A-7 against certain dealer upcards where doubling is ideal but standing beats hitting. |
| Split (P) | Divide a pair into two separate hands, matching your original bet on each. | Pairs of Aces and 8s always; pairs of 2s, 3s, 6s, 7s, and 9s against specific dealer upcards. |
| Surrender (R) | Fold and forfeit half your bet rather than play the hand. | Hard 15 or 16 against a dealer 9, 10, or Ace where you are a significant underdog. |
Blackjack Strategy Tips
Always split Aces and 8s
Splitting Aces gives you two strong starting hands. Splitting 8s converts a weak hard 16 — the worst hand in blackjack — into two hands starting with 8, each in a much better position.
Never split 10s
A hard 20 wins roughly 85% of the time. Splitting it for two hands starting at 10 is mathematically inferior, even though each 10 is a strong start individually. The combined value of keeping 20 intact almost always beats splitting.
Never take insurance
Insurance is a side bet that pays 2:1 if the dealer has a natural blackjack. Even when the dealer shows an Ace, only about 30% of hole cards are 10-value, so the insurance bet carries a house edge of around 7%. Basic strategy always ignores insurance.
Double down aggressively on 10 and 11
Players are often cautious about doubling down because it means committing extra money. But when you have 10 or 11 and the dealer shows a weak upcard, doubling is the highest expected-value play. Skipping the double is one of the most common expensive mistakes.
Stand on hard 12–16 against a dealer 2–6
These dealer upcards (2 through 6) are bust cards — the dealer must draw again and will bust more often than not. When the dealer is likely to bust, let them. Hitting risks busting yourself unnecessarily.
Hit stiff hands against a dealer 7 or higher
The same hard 12–16 hands that you'd stand on against a weak dealer become hitting hands when the dealer shows 7 through Ace. The dealer is unlikely to bust, which means your stiff total is unlikely to win without improving.
Practise the chart until decisions are automatic
Basic strategy only works if you apply it consistently and quickly. Use this tool to quiz yourself — select a random hand and dealer card, decide what you'd do, then check the recommendation box. The goal is to internalise the chart so every decision at a live table is instant.
Choose the right table rules
Basic strategy adjustments exist for different rule sets. Tables where the dealer hits on soft 17 (H17 vs S17) shift some decisions, as do rules around resplitting, doubling restrictions, and the number of decks. The chart in this tool uses 4–8 decks with dealer standing on soft 17 — the most common configuration at Canadian online casinos.
What is blackjack basic strategy?
Basic strategy is the set of mathematically optimal decisions for every possible combination of player hand and dealer upcard. It was derived through computer simulation of billions of hands and tells you — given the rules in play — whether to hit, stand, double down, split, or surrender in order to minimise the house edge. Playing perfect basic strategy reduces the casino's advantage to roughly 0.4–0.5%, lower than almost any other casino game.
Does basic strategy guarantee I'll win?
No. Basic strategy minimises expected losses over the long run — it does not guarantee a win on any single hand or session. Blackjack still involves significant variance, meaning you can play perfectly and lose in the short term. What basic strategy does is eliminate the additional house edge caused by suboptimal decisions, so you're always giving yourself the best mathematical chance.
What rules does this strategy chart use?
This chart is built for 4–8 deck blackjack where the dealer stands on soft 17, doubling after a split is allowed, and surrender is not available (except where indicated). These are the most common online blackjack rules at Canadian casinos. If your table uses different rules — such as the dealer hitting soft 17, or a single deck — some decisions shift slightly, and you'd need a chart specific to those rules.
Why should I always split Aces?
A pair of Aces as a single hand is worth either 2 or 12 — both weak. Splitting them gives you two separate hands each starting with an Ace, which is the strongest possible starting card. Each hand has a good chance of hitting a 10-value card for a soft 21. Most casinos only allow one additional card on split Aces, but even then, splitting is strongly favoured by the math.
Why should I always split 8s even against a dealer 10?
Hard 16 — two 8s combined — is statistically the worst hand in blackjack. You lose most of the time whether you hit or stand. Splitting into two hands starting with 8 is bad, but it is less bad than playing hard 16 as a single hand. Against a dealer 10 it still feels painful, but basic strategy confirms splitting is the least costly option available.
Is blackjack basic strategy the same as card counting?
No. Basic strategy is a fixed set of decisions based only on your hand and the dealer's upcard — it doesn't require tracking which cards have been dealt. Card counting is a separate technique where you monitor the ratio of high to low cards remaining in the shoe and adjust bet sizes and certain decisions accordingly. Basic strategy is the foundation card counters use, but the two skills are distinct. This tool covers basic strategy only.
Can I use this strategy at online blackjack tables?
Yes. Online blackjack games run on the same mathematical rules as live dealer tables, and basic strategy applies equally to both. Since online play is self-paced, you have more time to consult the chart or this advisor without pressure. Live dealer games at Canadian online casinos also respond well to basic strategy — the dealer's behaviour and probabilities are identical regardless of the medium.
How much does basic strategy lower the house edge?
Under the 4–8 deck, dealer stands on soft 17 rules used by this chart, perfect basic strategy reduces the house edge to approximately 0.40–0.46%. A typical player who ignores strategy gives the house an additional 1.5–2% edge through common mistakes. The difference between a 0.45% and a 2% house edge is substantial over any meaningful number of hands — basic strategy is genuinely worth learning.