Splitting two aces creates two hands, each starting with an ace, and requires a second bet equal to the first. Under the S17, multi-deck, American-peek rules used below, basic strategy splits aces against every dealer upcard. Check your game’s rules: ace restrictions and dealer-blackjack procedures matter.
How splitting aces works
- You receive A–A on your initial two-card hand.
- Choose Split and add a wager equal to the original bet.
- The aces become separate hands, each receiving another card.
- Each hand is settled separately against the dealer.
Many games give only one additional card to each split ace. Hitting, doubling or resplitting those aces may be restricted even when those actions are available on other split hands. Read the specific ace rules.
A $10 example: two hands, two results
You bet $10, receive A–A, then add $10 to split. One ace receives a king for 21; the other receives a 7 for soft 18. Suppose the dealer finishes with 20 and the game treats split-ace 21 as an ordinary 1:1 win.
| Hand | Returned including its stake | Net result |
|---|---|---|
| A–K: 21 beats 20 | $20 | +$10 |
| A–7: 18 loses to 20 | $0 | −$10 |
| Combined: $20 originally staked | $20 | $0 |
Splitting did not guarantee profit. If both hands lost, the round would lose $20; if both won at 1:1, it would profit $20. Pushes return the stake for the tied hand.
Is an ace and ten after splitting a blackjack?
Under standard rules, it is a 21 rather than a natural blackjack. It generally pays 1:1, even at a table that pays 3:2 for a natural on the original deal. A dealer natural normally beats a non-natural 21; the dealer-peek procedure can settle blackjack before a split is offered. Variants may differ.
| Hand type | Typical profit | Total returned |
|---|---|---|
| Original two-card natural at 3:2 | $15 | $25 |
| 21 after splitting, paid 1:1 | $10 | $20 |
Which pairs should you split?
Chart scope: four to eight decks, dealer stands on soft 17 (S17), American dealer peek, double after split allowed. Late surrender, when offered, does not change these pair choices in this configuration. “10” includes J, Q and K. Do not use this chart unchanged for H17, no-hole-card games or no-double-after-split rules.
| Pair | Split against dealer | Otherwise |
|---|---|---|
| A–A | Every upcard | — |
| 8–8 | Every upcard | — |
| 9–9 | 2–6, 8 and 9 | Stand against 7, 10 or ace |
| 7–7 | 2–7 | Hit against 8, 9, 10 or ace |
| 6–6 | 2–6 | Hit against 7 through ace |
| 2–2 or 3–3 | 2–7 | Hit against 8, 9, 10 or ace |
| 4–4 | 5 or 6 | Hit |
| 5–5 | Do not split | Double against 2–9 if allowed; otherwise hit |
| 10–10 | Do not split | Stand |
With 5–5 against 10 or ace, hit. For H17 with the same other rules and late surrender available, 8–8 against an ace is a surrender; if surrender is unavailable, split. See the surrender guide for that exception and the basic strategy charts for complete hand decisions.
Rules to check before you split
| Rule | Question to check | Why it matters |
|---|---|---|
| Split aces | One card only, or may you hit? | Aces can have tighter restrictions than other pairs |
| Resplitting aces | Can another ace be split again? | Availability and maximum hands vary |
| Double after split | Can you double the resulting hands? | Changes some pair decisions and possible exposure |
| Maximum hands | How many splits are allowed? | Limits both options and extra wagers |
| Matching values | Must the cards have the same rank? | K–Q may be treated differently from K–K |
| Dealer blackjack | Is there a peek; what stakes are lost? | No-hole-card games may expose extra split wagers |
Check the 3:2 or 6:5 natural payout too. A favourable splitting rule alone does not establish the best overall game.
Why pairs need their own strategy
Two fives form a useful hard 10; breaking them apart sacrifices that starting point. Two tens already make 20. By contrast, two aces can become two hands starting from a flexible ace. The recommendation compares expected results, not a guarantee that both split hands will win.
A pair of nines illustrates why slogans are incomplete: under the stated rules you stand against 7, but split against 8 or 9. Check the table rather than splitting every pair automatically. Budget for extra wagers using our bankroll guide.
Frequently asked questions
Should you always split aces?
Split them against every upcard under the chart’s stated rules. Do not extend that advice to every variant: no-hole-card liability and other restrictions can change strategy.
Can you hit after splitting aces?
Many games allow only one additional card per ace. Other games permit more action. Check the rules rather than assuming that normal split-hand options apply.
Can you resplit aces?
Only when the game permits it, and only up to its hand limit. A newly dealt ace does not automatically create permission to split again.
Does split-ace 21 pay 3:2?
Normally no: it is an ordinary 21 paid at 1:1. Use the game’s paytable for any variant-specific exception.
Should you split tens?
Stand on 20 under the basic-strategy rules used here. Being allowed to split does not make it the preferred action.
How much extra money does splitting require?
Each new hand normally needs a bet equal to the original. Doubles and further permitted splits can increase the round’s total stake.
Sources and next steps
Rules and strategy reference: Wizard of Odds blackjack rules and its rule-specific strategy calculator. Examples are educational; check the rules displayed by your game.
See how the split-ace rule changes your options.
Use the European practice game and split aces when the opportunity appears. This version gives one card to each split ace and does not allow resplitting aces. Open its rules panel before playing.
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- ○ How to Play Blackjack
- ○ Blackjack Strategy
- ○ Card Counting
- ○ Blackjack Odds
- ○ Blackjack Bankroll Management
- ○ The Rules Behind Splitting Aces
- ○ When Should You Surrender at Blackjack?
- ○ European Blackjack
- ○ Perfect Pairs Blackjack
- ○ Super 21 Blackjack
- ○ Free Online Blackjack
- ○ Real Time Gaming Blackjack Guide
- ○ Microgaming Blackjack Guide