In New South Wales, your ATAR is worked out by UAC from your scaled HSC marks. Each subject is scaled, your best 10 units (including 2 units of English) are added into an aggregate, and that aggregate is ranked against your age group to give an ATAR between 0.00 and 99.95. NESA sets and marks the HSC; UAC turns those marks into your ATAR.
Key takeaways
- Your NSW ATAR is a rank from 0.00 to 99.95, not an average of your marks.
- It is built from your best 10 units of scaled HSC marks.
- Two units of English must be included.
- UAC scales your marks and works out your ATAR. NESA sets and marks the HSC.
- Each HSC mark is half school assessment, half exam.
- Your school ranking matters, because it shapes how exam marks are shared out.
- The same ATAR is used by universities across Australia, not just NSW.
A rank, not a mark
The most important thing to know is that your ATAR is a rank. An ATAR of 85 does not mean you scored 85%. It means you finished ahead of about 85% of your age group.
Because it is a rank, it lets universities compare students who took completely different subjects. That is the whole point of the ATAR.
What the HSC is
The HSC is the Higher School Certificate, the Year 12 qualification in New South Wales. It is set and marked by NESA, the NSW Education Standards Authority.
You finish the HSC with a mark in each subject. Those marks are the raw material for your ATAR, but they are not your ATAR. That comes next.
How your HSC mark is built
Each HSC mark has two halves. Half comes from your school assessments across the year. Half comes from your final HSC exam.
Your school assessment marks are moderated against your cohort’s exam performance. This is why your ranking within your school matters. A strong rank protects your assessment mark, because the group’s exam results are shared out in rank order.
How UAC scaling works
Once you have your HSC marks, UAC scales them. Scaling adjusts each subject so that the same result means the same thing across subjects.
A subject scales up when the students taking it are strong across all their subjects. It scales down when the group is broader. Your rank within the subject never changes — scaling only changes how the mark counts towards your ATAR. See which subjects scale well in best scaling subjects in NSW.
Your best 10 units form an aggregate
NSW builds your ATAR from 10 units of scaled marks. Most subjects are 2 units, so that is usually five subjects. Extension subjects are 1 unit each.
Two of those units must be English, which is compulsory. UAC takes your best 10 units, including English, and adds them into an aggregate. Your weaker units may not count at all.
A worked example
Say you take English (2 units), Maths (2 units), Biology (2 units), Business Studies (2 units) and Modern History (2 units). That is 10 units.
UAC scales each one, then adds your best 10 units into an aggregate. That aggregate is compared with every other student’s. If it sits higher than 88% of them, your ATAR is about 88.00. Your strongest subjects do most of the work.
Who does what in NSW
Two bodies are involved, and it helps to keep them straight. NESA runs the HSC: it sets the courses, the exams, and your HSC marks. UAC takes those marks, scales them, and works out your ATAR.
So NESA gives you your HSC. UAC gives you your ATAR. We cover UAC in detail in UAC explained.
How many units do you need?
You need at least 10 units to get an ATAR, including 2 units of English. Most students take 10 to 12 units, which is five or six subjects.
Taking a couple of extra units is a smart safety net. If one subject goes poorly, your best 10 units still count, and the weak one drops out.
Common mistakes
The first mistake is reading the ATAR as a percentage. It is a rank. The second is picking subjects only because they scale well, then scoring poorly in them. A strong mark in a subject you are good at beats a weak mark in a high-scaling one.
The third is ignoring your school ranking. In NSW, your rank shapes your assessment mark through moderation, so it matters as much as the exam itself.
Estimate your NSW ATAR
The clearest way to see all this is to try it. Our NSW ATAR calculator applies the latest official HSC scaling to your marks and gives you an estimated ATAR.
An estimate is not your official result, which only UAC can give. It shows you where you stand now, so you can set a realistic target for the rest of Year 12.
Common questions
How many units do you need for a NSW ATAR?
You need at least 10 units, including 2 units of English. Most students take 10 to 12 units, which is five or six subjects. Your best 10 units count towards your ATAR.
Is English compulsory for the NSW ATAR?
Yes. At least 2 units of English must be included in your best 10 units. It is the only compulsory part of the NSW ATAR.
Who calculates the NSW ATAR?
UAC, the Universities Admissions Centre, calculates the NSW ATAR. NESA sets and marks the HSC, and UAC scales those marks and works out your ATAR.
How does HSC scaling work?
UAC scales each subject based on how strong the students taking it are across all their subjects. A strong cohort scales a subject up; a broader one scales it down. Your rank within the subject never changes.
What is the maximum NSW ATAR?
The highest possible ATAR is 99.95, the same across Australia. Ranks below 30.00 are usually reported as “less than 30”.