When to Split in Blackjack: The Pairs Worth Breaking Up

Knowing when to split in blackjack comes down to a handful of pairs. A pair gives you a choice most hands don’t: keep it as one hand or break it into two, and the right call changes with the pair and the dealer’s card.

The short version: always split aces and 8s, and never split 10s or 5s. Every other pair depends on the dealer’s upcard, which is where most players slip. This guide highlights the pairs that cause the most confusion and the table rules that can change the answer.

How Does Splitting Work in Blackjack?

Splitting turns a starting pair into two separate hands. You only have the option to do it on your first two cards when they match, like two 8s or two 6s, after which you must place a second bet equal to your first. At a live table, place a matching bet next to your original and say “split.” Online, you click a button indicating split and the game handles the rest. Our blackjack rules covers the other basics.

After splitting your cards, the dealer deals a new card to each hand, and you play them one at a time. Each hand settles on its own. You can win both, lose both, or win one and lose the other. A push returns the wager on that hand only.

Splitting isn’t the same as doubling down. A double keeps you on one hand and gives you exactly one more card for twice the bet. A split gives you two hands and two bets, and you can usually keep hitting each one.

Say you’re dealt 7-7 against a dealer 5 with $25 down. Your pair totals a hard 14, which is an awkward hand to play. Splitting creates two hands starting at 7 and requires another $25 bet. Under these rules, splitting is the better long-term play, although either or both hands can still lose.

Should You Split 10s in Blackjack?

No. Basic blackjack strategy says to stand on a pair of 10s. A hard 20 is already one of the best hands you can hold, and splitting it throws that away for two hands that each need help.

The urge to hit may be greater when the dealer shows a 5 or 6, the weakest upcards. But by doing so you would be putting out a second bet while swapping a hand that wins most of the time for two hands that win less often. The extra bet doesn’t pay for what you give up with a hard 20.

Card counters are the exception. At very high counts, splitting 10s against a 5 or 6 can show a profit. Without a count, stand.

When Should You Split 6s in Blackjack?

Under common multi-deck rules, split 6s against a dealer 2 through 6 if double after split (DAS) is allowed and dealer 3 through 6 if it isn’t. Against anything else, hit.

A pair of 6s is a hard 12, and hitting a 12 busts on any 10-value card. Weak dealer upcards bust or finish low often enough that you want two hands with room to grow instead of one hand with room to bust. Each new hand starts at 6 and can build into a solid total.

The dealer 2 shows why DAS matters. With DAS, you split 6-6 against a 2, because a 5 on either new hand makes 11 and you can double it. Without DAS, that follow-up is off the table, so basic strategy says to hit.

How Many Times Can You Split Aces in Blackjack?

It depends on the casino. Many games let you split aces once and don’t allow resplitting, which caps you at two hands. Some tables allow resplitting aces up to three or four hands, so check before you sit down.

Most casinos also deal one card to each split ace. You can’t hit or double after that.

What lands on the ace decides the hand. A 10-value card makes 21. A low card, such as a 5, leaves you with a soft 16. A second ace lets you resplit if the table permits it; if it doesn’t, that hand sits at a soft 12.

A split ace plus a 10-value card counts as 21, not a natural blackjack. It pays even money when it wins instead of 3:2, and it can push if the dealer also makes 21.

Why Should You Split 8s in Blackjack?

A pair of 8s is a hard 16, one of the weakest hands in blackjack. Against most upcards, hitting or standing on it loses more often than it wins.

Two hands that start at 8 are in much better shape than one hand sitting on 16. Even against a 9, 10, or ace, where you’ll still lose plenty of rounds, splitting loses less over time than the alternatives. Under six decks, S17, DAS, and no surrender, you split 8s against every upcard. You’re cutting a loss, and nothing here guarantees a win.

Blackjack Splitting Rules That Vary by Casino

Splitting rules aren’t uniform, and a few of them change the right play. Online, look in the game’s rules or info panel. At a live table, check the felt and any rules card, or ask the dealer.

Also check the natural payout. A 6:5 payout generally increases the house edge substantially compared with a 3:2 game, often outweighing the small advantages of favorable splitting rules.

Blackjack Pair Splitting Strategy Chart

This chart shows when to split in blackjack for every pair, assuming six decks, dealer stands on soft 17, double after split allowed, and no surrender. It follows standard published basic strategy for those rules. If your table plays differently, adjust using the rules section above. For the full hit, stand, and double chart, see our blackjack basic strategy guide.

Using Splitting Strategy at the Table

Before you split, check three things: the pair you hold, the dealer’s upcard, and the rules posted for your table. Basic strategy can reduce the house edge to around 0.5% in favorable, common blackjack games, although the exact figure depends on the rules.