Does everyone have to hit on 17?

No. The dealer has no choice: the felt says S17 or H17 and the dealer follows it. You always have a choice, and the correct answer depends entirely on whether your 17 is hard or soft.

Should I ever hit a hard 17?

No, against any upcard. Standing beats hitting against all ten, by between 0.0793 and 0.5205 per unit staked. It is one of the few decisions in blackjack with no exceptions at all.

Should I hit a soft 17?

Yes, against every upcard without exception. Hitting beats standing by between 0.1163 and 0.3090 per unit. A player who stands on all 17s is wrong every single time the 17 is soft.

What is the difference between S17 and H17?

It describes what the DEALER must do on a soft 17. H17, where the dealer hits, costs the player 0.22 percentage points against a table where the dealer stands.

Why does soft 17 play so differently?

Because it cannot bust. An ace counted as 11 falls back to 1, so drawing to a soft 17 risks nothing and can only improve the hand or leave it where a hard 17 already was.

Hitting on 17 in Blackjack: Three Different Questions

The dealer does not choose. The felt says S17 or H17 and the dealer follows it. You should never hit a hard 17, against any upcard. You should always hit a soft 17, against any upcard. The second and third are opposite answers to what looks like the same question, and the tables below are why.

1. The dealer's rule is not a decision

Printed on every table: dealer stands on all 17s or dealer hits soft 17. Whichever it says, the dealer has no discretion, no judgement and no read on you. The rule is fixed before the cards come out.

It is not free, though. A table where the dealer hits soft 17 costs you 0.22 percentage points compared with one where the dealer stands, computed by repricing the whole game under both rules. On a base house edge of 0.5153%, that is a large fraction of what you are paying. Read the felt before you sit.

2. Your hard 17: never hit, and there are no exceptions

Dealer shows	Stand	Hit	Standing gains
A	-0.4780	-0.5573	+0.0793
2	-0.1530	-0.5362	+0.3832
3	-0.1172	-0.5317	+0.4145
4	-0.0806	-0.5270	+0.4464
5	-0.0449	-0.5230	+0.4780
6	+0.0117	-0.5088	+0.5205
7	-0.1068	-0.4835	+0.3767
8	-0.3820	-0.5060	+0.1240
9	-0.4232	-0.5537	+0.1305
10	-0.4197	-0.5845	+0.1647

Standing wins against all ten upcards. The margin is smallest against an ace, at 0.0793 per unit, and largest against a six at 0.5205. Notice that standing on 17 is a losing play against almost every upcard, which is the part people find hard: the numbers in the stand column are mostly negative. You are not choosing between winning and losing. You are choosing the smaller loss, and hitting makes it bigger every time.

3. Your soft 17: always hit, and there are no exceptions either

Dealer shows	Stand	Hit	Hitting gains
A	-0.4780	-0.1796	+0.2985
2	-0.1530	-0.0005	+0.1525
3	-0.1172	+0.0290	+0.1462
4	-0.0806	+0.0593	+0.1399
5	-0.0449	+0.0912	+0.1361
6	+0.0117	+0.1281	+0.1163
7	-0.1068	+0.0538	+0.1606
8	-0.3820	-0.0729	+0.3090
9	-0.4232	-0.1498	+0.2734
10	-0.4197	-0.1969	+0.2229

The same total, the opposite answer, against every upcard. Someone following "stand on all 17" is wrong 100% of the time the 17 is soft, not occasionally.

The reason is that a soft 17 cannot bust. The ace counted as eleven drops to one the moment the hand would go over, so drawing risks nothing and can only move the hand somewhere better or leave it where a hard 17 already stood. Against a 3 through 6 the difference is enough to turn a losing hand into a winning one: stand on A-6 against a five and you are at -0.0449; hit it and you are at +0.0912.

What this is worth against everything else

These are per-hand differences on hands that happen often, which is why they matter more than they look. But the rules you sit down to still decide more: a 6:5 table costs 1.39 percentage points, which is six times the H17 rule and more than perfect play recovers. Our blackjack page computes the game at 0.5153% under a standard rule set, and basic strategy carries the rest of the decisions.

Frequently Asked Questions

Does everyone have to hit on 17?: No. The dealer has no choice: the felt says S17 or H17 and the dealer follows it. You always have a choice, and the correct answer depends entirely on whether your 17 is hard or soft.
Should I ever hit a hard 17?: No, against any upcard. Standing beats hitting against all ten, by between 0.0793 and 0.5205 per unit staked. It is one of the few decisions in blackjack with no exceptions at all.
Should I hit a soft 17?: Yes, against every upcard without exception. Hitting beats standing by between 0.1163 and 0.3090 per unit. A player who stands on all 17s is wrong every single time the 17 is soft.
What is the difference between S17 and H17?: It describes what the DEALER must do on a soft 17. H17, where the dealer hits, costs the player 0.22 percentage points against a table where the dealer stands.
Why does soft 17 play so differently?: Because it cannot bust. An ace counted as 11 falls back to 1, so drawing to a soft 17 risks nothing and can only improve the hand or leave it where a hard 17 already was.

Both tables are produced by seventeen_math.py at build time from blackjack_math.py, which prices the game by recursion rather than quoting published charts. The build checks the two claims this page makes before writing it: that standing beats hitting on a hard seventeen against all ten upcards, and that hitting beats standing on a soft one against all ten. If either failed against a single upcard the page would not be written. Last computed September 2026.