Blackjack Split: When to Split Pairs, Rules and Chart

A blackjack split turns a pair into two separate hands. You add a second bet equal to the first, then play each hand against the dealer. The useful question is whether separating those cards gives you a better decision than keeping them together.

Two eights and two tens are both pairs, but they need very different treatment. Eights make an awkward 16; tens already give you 20. Below you'll find a split chart, a worked £5 example and the table rules that can change the answer.

What is a split in blackjack?

When your first two cards form an eligible pair, you can separate them and place an equal additional stake. Each original card starts a new hand. The dealer deals further cards, and the two hands are settled separately against the same dealer hand.

Most ordinary games allow cards of the same value, so a king and a queen may qualify because both count as ten. Some require the same rank instead. Being allowed to split a pair does not mean that splitting it is the best play.

You normally choose before taking another card. A three-card total of 16 cannot be split just because it adds up to the same number as 8 + 8. For the rest of the game's decisions, our blackjack rules guide covers card values, hitting, standing and payouts.

How to split in blackjack: a £5 example

Suppose you bet £5 and receive two eights against a dealer 6 at a table using the chart rules below.

1. Choose Split. In an online game, select the Split button while the decision is available. At a physical table, place the matching chips as instructed by the dealer.
2. Add another £5. You now have £10 committed: £5 on each hand.
3. Play the first eight. If it receives a 3, that new hand totals 11. Your next choice depends on whether doubling after a split is permitted.
4. Play the second eight. If it receives a king, it totals 18. This hand has its own decision and stake.
5. Settle both hands. You might win both, lose both, win one and lose the other, or push on a hand.

If you then double the first £5 hand, you add a further £5. That puts £10 on the first hand and £5 on the second, for £15 in total. The Split button creates another hand; the Double button increases the stake on one hand and gives it one final card.

Blackjack split chart: which pairs should you split?

Find your pair on the left and the dealer's visible card across the top. A means ace; 10 includes any ten-value dealer card. These are initial-pair decisions, not a chart for every blackjack variant.

P: split. P*: split if DAS is allowed; otherwise hit. H: hit. S: stand. D: double if allowed; otherwise hit.

For all the hit, stand and double decisions beyond pairs, open our full blackjack strategy chart. Its rule settings matter too: changing the table rules can change a correct decision.

When to split each pair

Aces: usually the first pair to learn

Under the chart rules, split two aces against every dealer upcard. Kept together, they make a soft 12. Separating them gives each ace its own chance to form a stronger hand, usually with just one further card allowed.

An ace followed by a ten after splitting normally makes an ordinary 21. It does not become a natural blackjack paying 3:2. That distinction matters when the hand is settled, and it also means a dealer blackjack can beat it.

Eights: breaking up a difficult 16

Split eights against every upcard under the chart's dealer-peek, no-surrender rules. Keeping hard 16 is uncomfortable: standing leaves a weak total, while many hit cards bust it. Starting two hands from eight is the better basic-strategy decision here.

Against a strong dealer card, splitting can still have a negative expected result. The advice is about choosing the better of the available plays, not turning a bad situation into a guaranteed profit. The no-hole-card and surrender exceptions below are worth knowing.

Tens and fives: keep the useful total

Stand on a pair of tens. A total of 20 is already strong, and splitting breaks it apart while adding another stake. This also applies to a king and queen when the game treats them as a splittable pair.

With two fives, play the hard total of 10 instead. In this chart, double against dealer 2-9 if allowed; otherwise hit. Against 10 or ace, hit. A pair does not have to be split just because the button lights up.

Fours: check whether you can double afterwards

Split 4 + 4 against a dealer 5 or 6 only when doubling after a split is allowed. Otherwise, hit. The possibility of making a useful double-down hand is part of why the split works under those rules.

That is why "never split fours" is too broad. Equally, "split them against a weak dealer card" misses the DAS requirement.

Twos, threes, sixes and sevens

With DAS, split twos and threes against 2-7, sixes against 2-6, and sevens against 2-7. Without DAS, the split range narrows to 4-7 for twos and threes, and 3-6 for sixes. The sevens range stays the same.

Hit these pairs against the higher upcards shown in the chart. A small pair does not make splitting automatic: the dealer's upcard and the DAS rule decide.

Nines: remember the dealer 7

Split nines against 2-6, 8 or 9. Stand against 7, 10 or ace. The dealer 7 is the easy one to forget: your existing 18 already beats a dealer total of 17, so the chart keeps it intact. That does not mean the dealer must finish on 17.

The table rules that change splitting strategy

Doubling after a split

DAS means you may double an eligible two-card hand created by splitting. It gives the new hands an option they would otherwise lack, which is why several small-pair decisions change. The P* cells show exactly where that matters in this chart.

Re-splitting and the maximum number of hands

If a split hand receives another matching card, some games let you split again. A four-hand limit means up to four hands in total, not four extra hands after the original. Other games stop after the first split, and aces often have tighter restrictions.

Check the exact game, not just the casino name. For example, Betfred's published Blackjack Surrender rules allow doubling after a split but do not allow a split hand to be split again. The game also limits each split ace to one additional card.

Split aces and blackjack payouts

Many tables deal one card to each split ace and then end those hands. You may not be able to hit, double or re-split them. Do not assume the normal options remain available just because you could use them after splitting eights.

A winning split hand normally pays 1:1, including a two-card 21 made after the split. With a £5 stake, that means £5 profit plus the £5 stake returned. A natural blackjack is the qualifying ace-and-ten combination in your original two cards, before any split.

Dealer peek versus no-hole-card rules

The chart assumes the dealer checks for blackjack before you commit extra money. Some games let you split first and only reveal a dealer blackjack afterwards. The important question is whether that blackjack takes your additional split and double bets too.

A game that takes only the original stake on dealer blackjack has different protection. Do not treat every game labelled "European" or "no peek" as the same rule set.

Surrender and other variants

When late surrender is available, check it before applying a no-surrender chart. One specific example: in a matching multi-deck dealer-peek game where the dealer hits soft 17, late-surrender 8 + 8 against an ace if permitted; split if that option is unavailable. That exception does not apply to the S17 chart above.

Single-deck, double-deck, Free Bet and other special blackjack variants need their own strategy. A free split changes the cost of the decision, so this paid-split chart should not be carried across unchanged.

How much can you win or lose after splitting?

With two £5 hands, £10 is on the table. The examples below assume ordinary 1:1 wins, no side bets, no doubles and no further splits. "Returned" includes any winning or pushed stake coming back.

Splitting increases the amount committed to the round. It does not make the hands independent of the dealer: both still face the same dealer result. Keep enough room within your chosen stake limit for the extra bet, rather than treating it as free money.

Common splitting mistakes

• Using a slogan without checking the rules. Aces and eights are the familiar starting point, but dealer-blackjack and surrender rules can change the play.
• Splitting every available pair. Tens and fives show why the option and the strategy are separate questions.
• Forgetting the additional stake. One £5 split creates £10 of exposure before any further action.
• Expecting 3:2 for a split 21. Under ordinary rules it is a normal hand, paid at 1:1 if it wins.
• Judging the decision from one result. A correct split can lose both hands. That does not, by itself, make the decision wrong.

Where to practise blackjack splitting

Start with our free blackjack games or the hand checker in our basic strategy guide. Match the rules before comparing your decisions. Try 4 + 4 against 5 with DAS switched on and off, then compare 9 + 9 against 7 and 8.

For real-money tables, the exact game's help screen is the place to check splitting, re-splitting, double-after-split and dealer-blackjack rules. Betfred is one current OC partner with published split rules for individual games; our blackjack casino comparison covers more options.

Explore blackjack at Betfred

Practise with free blackjack

Casino links are affiliate links. 18+ only. Basic strategy does not guarantee a win; keep all split and double bets within your budget.