What a soft 17 is
A soft hand is one that contains an ace counted as 11. A soft 17 is therefore an ace and a 6 (11 plus 6), or an ace with several small cards that add up the same way, such as ace, 2 and 4. It is called soft because it cannot bust with one more card: drawing a ten would turn the ace into a 1 and give 17 again, not a bust.
A hard 17, by contrast, has no ace counted as 11 and does not have that flexibility.
The rule
The dealer plays by fixed rules: hit on 16 or less and stand on 17 or more. The only part that differs between tables is what to do with a soft 17. There are two versions:
- S17: the dealer stands on all 17s, soft ones included.
- H17: the dealer hits a soft 17, and stands on hard 17.
The rule is normally printed on the felt, using words such as “Dealer must stand on all 17s” or “Dealer hits soft 17”.
Why hitting helps the dealer
A dealer who stands on soft 17 keeps a hand that is not especially strong. A dealer who hits risks nothing on that draw, because no card can bust a soft 17. The draw may turn 17 into 18, 19, 20 or 21, or into a lower hard total that the dealer then keeps drawing on, where a bust is possible.
Since the hit option only gives the dealer more chances to make a better hand, H17 tends to produce somewhat fewer player wins on average. The effect is small on one hand, but it affects every hand in which the dealer ends up with a soft 17, which is a modest share of all dealer hands.
The size of the effect
The commonly cited figure is that H17 raises the house edge by roughly 0.2 percentage points compared with S17, with other rules unchanged. The exact value depends on the number of decks and the other rules, so treat it as approximate. Compare that with a typical baseline house edge of well under one percent: a change of this size is meaningful in relative terms, though small in any single session.
An illustration: if a player bets 10 units a hand for 200 hands, the total wagered is 2,000 units. A 0.2 percent change in the edge corresponds to about 4 units of extra expected cost (0.002 times 2,000). Actual results will vary far more than that, so the figure is useful for comparing tables, not for predicting a session.
How it connects to other rules
The soft 17 rule is one of several rule variations that shift the odds, and it adds to the others. A table that pays 6 to 5 on naturals and has H17 combines two rules that favour the casino. A table that pays 3 to 2 with S17 is generally more favourable to players than the reverse. How much each rule matters is the subject of the effects-of-rules tables elsewhere on this site, where the individual rule effect values are compared side by side.
Basic strategy also changes slightly under H17. A few borderline decisions, such as doubling or surrendering on certain totals, differ from S17 charts. If you use a printed chart, make sure it matches the table’s rule.
How to check the rule
- Read the arc text on the felt.
- Check the table sign, which sometimes repeats the rule.
- Ask the dealer if neither is clear.
- Online, the rules or help screen typically lists it.
Keeping it in perspective
Preferring S17 means choosing a slightly lower edge, not a winning game. The house keeps an advantage under either version, and outcomes in a session remain uncertain. Choose limits you can afford, take breaks, and seek support from a local service if gambling starts to cause you problems.