Blackjack may seem straightforward at first, but certain cards can make a hand less obvious than it might appear. Aces are a clear example.
One ace adds flexibility to your hand, while two aces together may raise questions about how they are counted, what options are available, and the best way to approach them.
This guide explains how aces work in classic blackjack, what happens when you are dealt a pair, and how different casino rules can change the way you play them. By the end, you will have a better understanding of why aces are often viewed as the most significant cards in the game.
Every card in blackjack has a set value, except the ace. Number cards (2–10) equal their number, while jacks, queens, and kings count as 10 each. The ace is flexible, counted as either 1 or 11, depending on which total may be safer.
For example, an ace with a seven can be played as 8 or 18. This is called a soft hand because the ace can adjust. If another card is drawn and the total would exceed 21, the ace automatically drops to 1. This ability to move between two values is what makes aces unique.
Unlike other cards, an ace reshapes the way a hand develops. It can sometimes turn what would normally be a weak position into one that can safely take another card.
Take ace and six as an example. On its own, six is low and vulnerable. With the ace, you hold a soft 17, which lets you draw again without being locked into a stiff total. If the next card is high, the ace adjusts to 1. If the card is low, it remains 11 and strengthens the hand.
This flexibility is a big reason why basic strategy — the set of decisions based on the mathematical analysis of blackjack hands — treats aces differently from other cards. The ace often changes whether the potentially better move is to hit, stand, double, or split. Aces also create the strongest starting hand when paired with a ten-value card: a natural blackjack, which under most UK rules pays 3:2.
Two aces together cannot both be counted as 11, as that would give 22 and bust. Instead, one is 11 and the other 1, giving a total of 12.
At most UK tables, this pair can be split. Splitting means placing another stake equal to your first, turning one hand into two. Each ace then receives an additional card. This option exists because a hard 12 is one of the least favourable totals in blackjack, while two separate hands beginning with an ace each have far more potential.
House rules differ, so it can be worth knowing in advance whether splitting is permitted and what limits apply.
In standard blackjack, basic strategy recommends splitting aces because two new hands each starting on 11 are stronger than one hand of 12.
For instance, if you split and draw a ten on one hand, you have 21. If the other ace draws a mid-value card, you may still hold a playable total. By contrast, leaving both aces together gives you a difficult 12 that struggles against many dealer cards.
One point to be aware of is that some casinos use the European no-hole-card rule. In this format, the dealer does not check for blackjack until all players have acted. If you split aces and the dealer later reveals blackjack, both wagers are lost. This rule does not apply everywhere, but it explains why the “best choice” depends partly on the version of blackjack you are playing.
While the value of an ace is always 1 or 11, the options after receiving one can differ by casino. This is why players often check the rules before playing.
Common differences include:
These rules are normally displayed on the table felt in land-based casinos or within the information section online.
Examples help to show how aces work in practice:
Because aces can be used in two ways, players sometimes misunderstand their role.
Blackjack is a game of chance. Aces can improve your options, but no strategy removes uncertainty or guarantees a result.
If you decide to play, set limits that suit your budget and take time away from the table when needed. Treat blackjack as a form of entertainment, not a way to make money.
*All values (Bet Levels, Maximum Wins etc.) mentioned in relation to these games are subject to change at any time. Game features mentioned may not be available in some jurisdictions.
**The information provided in this blog is intended for educational purposes and should not be construed as betting advice or a guarantee of success. Always gamble responsibly.