HSC ATAR calculator

Enter your NSW HSC marks to see an estimated scaled mark for each course, how UAC would build your aggregate out of 500, and an estimated ATAR. Set a target ATAR to see the HSC mark each course you leave blank needs. Everything here is an estimate based on UAC's 2025 scaling, not an official ATAR.

Estimate your ATAR from HSC marks

Add each HSC course and your HSC mark (actual or predicted): out of 100 for a 2-unit course, out of 50 for a 1-unit course such as an Extension. Each course shows its estimated scaled mark per unit and whether its units count.

Set a target and leave a course's mark blank to see the HSC mark it needs. Marks you enter stay fixed.

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Estimated ATAR

An ATAR needs:

  • 2 units of English (done)
  • 10 units of ATAR courses (still needed)
  • 3 courses of 2 units or more (still needed)
  • Courses from 4 subjects (still needed)

HSC scaling lookup

Pick a course and an HSC mark to see its estimated scaled mark under UAC's 2025 scaling.

Estimated scaled mark (per unit)

33.2

Out of 50.

Adds to the aggregate

66.4

If all 2 units count, out of 100.

An HSC mark of 80/100 in Mathematics Advanced, based on UAC's 2025 scaling.

UAC scales raw marks, not the HSC marks on your results, so two students with the same HSC mark can end up with different scaled marks. This estimate assumes your HSC mark sits at the same point in the course's 2025 spread of scaled marks (percentile matching), with a straight line between UAC's published points. Scaling reflects how strong the students in a course were across all their courses, not how hard the course is.

Data: UAC, Report on the Scaling of the 2025 NSW HSC (published June 2026). Unit values from UAC's list of HSC courses. Courses with fewer than 40 students in 2025 are not listed, because UAC publishes no percentiles for them. AusGrader is not affiliated with UAC or NESA, and every result here is an estimate based on UAC's 2025 scaling, not an official ATAR. Scaling changes every year.

How the calculator works

UAC scales each course's marks for the strength of the students taking it. UAC's 2025 Scaling Report publishes, for each course, the HSC marks and scaled marks at the 25th, 50th, 75th, 90th and 99th percentiles and the top mark. This calculator assumes your HSC mark sits at the same point in the scaled marks and draws a straight line between those points. UAC says these figures are not a conversion table, because it scales raw marks rather than the HSC marks you receive, so treat each scaled mark as an estimate.

Your aggregate is your best 2 units of English plus your best 8 units of everything else, out of 500. An English Extension can fill the English units if it scales higher, and part of a course can count (1 unit of a 2-unit course). With Mathematics Extension 2, UAC leaves out Mathematics Advanced and counts Extension 1 as 2 units. The aggregate is then read against UAC's 2025 table of aggregates for ATARs from 50.00 to 99.95 and rounded down to the nearest 0.05. Below an aggregate of 165.7 there is no estimate.

With a target ATAR set, the marks you enter stay fixed and each course you leave blank shows the HSC mark it needs. The calculator finds the lowest scaled mark per unit that, given to every blank course, reaches the aggregate the target needs, so it assumes those courses all scale the same. A course whose full marks fall short of that scaled mark is held at full marks, and the others need more.

Scaling changes every year with the cohort, so your real ATAR can differ. For the full explanation, including how to choose subjects, read how the HSC ATAR is calculated. For when results arrive, see the HSC results guide.

Planning for uni? See the ATAR requirements for NSW and ACT uni courses.