What Is an Ace in Blackjack? Card Values, Soft Hands and Strategy

An ace in blackjack is the only card that has two values: it counts as 1 or 11, whichever helps your hand more. It counts as 11 unless that would take your total over 21. If it would, the ace drops to 1. That flexibility makes the ace the most valuable card in the game.

The other values are simple. Cards 2 to 10 are worth their number, and the picture cards (jack, queen and king) are each worth 10. An ace plus any 10-value card as your first two cards is a blackjack, the best hand at the table.

This guide covers what an ace is worth in blackjack, how soft and hard hands work, the odds of being dealt a blackjack, what to do when the dealer shows an ace, and how to play your own ace hands without throwing away value.

All cards in a standard deck have a fixed points value except the ace. Suits make no difference. The dealer uses exactly the same values as you do.

So if you’re wondering how much a king, queen or jack is worth in blackjack, the answer is the same for all three: 10. Because the 10s, jacks, queens and kings all count as 10, there are 16 ten-value cards in every 52-card deck, nearly a third of it. You can see how the deck is made up in our guide to the 52-card deck.

An ace is worth 11 by default and 1 whenever 11 would bust you. You don’t have to announce which value you’re using. The hand is simply read in whatever way gives the best total of 21 or less, and online games show both totals on screen (for example “7/17”).

• Ace + 6 = 7 or 17
• Ace + 6 + 5 = 12 (counting the ace as 11 would give 22, so it counts as 1)
• Ace + 9 = 20
• Ace + ace = 2 or 12 (only one ace can ever count as 11, because two would make 22)

When you hold several aces, at most one of them counts as 11. For example, ace + ace + 9 is 21 (11 + 1 + 9), and ace + ace + ace + 8 is also 21 (11 + 1 + 1 + 8).

The ace’s two values are why blackjack has soft and hard hands. A soft hand contains an ace that is currently counting as 11. A hard hand has no ace, or has an ace that must count as 1 to keep the total at 21 or under.

A soft hand can’t bust on the next card. If you hold soft 15 (ace + 4) and draw a 10, the ace simply drops to 1 and you have hard 15. That’s why soft totals are played much more aggressively than hard totals of the same number.

Worked example

1. You’re dealt ace + 3: soft 14.
2. You hit and draw a 9. Counting the ace as 11 gives 23, so it switches to 1: hard 13.
3. You hit again and draw a 5: hard 18. You stand.

The same idea applies to the dealer. Many tables state whether the dealer hits or stands on soft 17 (ace + 6). Tables where the dealer stands on soft 17 are slightly better for the player, so check the table rules before you sit down.

An ace with any 10, jack, queen or king as your first two cards is a blackjack (also called a natural). Unless the dealer also has blackjack, which is a push, it wins straight away. On standard tables it pays 3:2, compared with even money (1:1) for an ordinary win.

That £3 difference adds up. Paying 6:5 instead of 3:2 adds roughly 1.4 percentage points to the house edge, more than every other common rule change combined. Avoid 6:5 tables wherever you can. Our guide to choosing an online blackjack table explains which other rules to check.

How often are you dealt blackjack?

With a single deck, the chance is 2 × (4/52) × (16/51) = 128/2,652, or about 4.83%, which works out to roughly one hand in 21. In a six-deck shoe it is 2 × (24/312) × (96/311), about 4.75%. More decks slightly reduce how often blackjacks appear.

A pair of aces is the best starting pair in the game, and basic strategy says to always split it. Played together, the two aces make a weak soft 12. Split, each ace becomes a strong starting card.

Casinos limit how far you can push this advantage:

• One card only. Most tables give each split ace a single extra card, and you can’t hit again.
• 21 isn’t blackjack. If a split ace gets a 10-value card, it counts as 21 and pays even money, not 3:2.
• Re-splitting is often barred. Some casinos won’t let you split again if you draw another ace.

Even with those limits, splitting aces is clearly the right play against every dealer upcard. For the full set of pair and doubling decisions, see when to double down and split pairs.

A dealer ace is the worst upcard you can face, because the dealer may already have blackjack. When it appears, you’ll usually be offered insurance: a side bet of up to half your stake that pays 2:1 if the dealer’s hole card is worth 10. The dealer’s exact procedure for checking (peeking) is covered in our guide to how the dealer deals blackjack.

Insurance looks like protection, but the maths is against it. In a six-deck shoe, ignoring the cards already on the table, 96 of the 311 unseen cards are worth 10, so the hole card is a ten about 30.9% of the time. A 2:1 payout only breaks even at 33.3%:

Expected value per £1 = (96/311 × £2) − (215/311 × £1) = −£23/311 ≈ −7.4%

That’s a house edge of about 7.4% on the side bet, far worse than the main game. Basic strategy players should decline insurance, and “even money” when they hold blackjack themselves, which is the same bet under another name.

Because a soft hand can’t bust on the next card, the usual advice is to draw or double more often than you would with a hard total. The guidelines below follow standard basic strategy for multi-deck games where the dealer stands on soft 17. Exact plays can shift slightly with the rules.

If doubling isn’t allowed, hit instead (or stand with soft 18). The most common mistake is standing on soft 17 or soft 18 against a strong dealer card. A total of 17 rarely wins, and hitting carries no risk of busting. Our blackjack rules and basic strategy guide covers the hard-hand decisions too.

• Reading the hand wrong. Ace + 5 + 10 is hard 16, not 26 and not soft 16. Always count the ace as 1 once 11 would bust you.
• Standing on soft 17. You can’t bust by hitting, and 17 is a weak total.
• Not splitting aces because “12 isn’t bad”. It is, and two hands starting with an ace are far stronger.
• Taking insurance out of fear of the dealer’s ace. It carries a house edge of around 7% in a six-deck shoe.
• Playing 6:5 tables. This cuts the value of every blackjack you’re dealt.

Card counters also track aces. In the Hi-Lo system an ace counts as −1, because a shoe rich in aces raises the chance of blackjacks. You can learn the method in our Hi-Lo card counting guide, but online games that shuffle continuously make counting ineffective.

• An ace is worth 11 unless that would bust your hand, in which case it’s worth 1.
• Kings, queens, jacks and 10s are all worth 10. Cards 2–9 are worth their face value.
• Ace + a 10-value card is blackjack. Look for 3:2 payouts and avoid 6:5.
• Play soft hands aggressively, always split aces and skip insurance.

Good play with aces lowers the house edge, but it doesn’t remove it. Blackjack is a game of chance over any session, so set a budget and a time limit before you play, never chase losses, and treat it as paid entertainment rather than a way to make money. Gambling is for adults aged 18 and over only.