Skip to content
My ATAR CalculatorAustralia
CalculatorHow ATAR worksScalingState guidesFAQ

How this calculator works, and where it stops.

An independent tool built on published admissions data. The method is transparent, the data has a date, and the limits are real.

What this site does

The calculator takes the marks you enter, estimates the scaled mark for each subject, applies the counting rules for your state, and converts the resulting aggregate into an ATAR. It runs entirely in your browser.

The data

  • Course scaling: the 2025 mean, standard deviation, maximum and 25th, 50th, 75th, 90th and 99th percentiles for HSC and scaled marks, from UAC’sReport on the Scaling of the 2025 NSW HSC, Table A3.
  • Aggregate to ATAR: UAC’s published 2025 relationship between selected NSW aggregates and ATARs, from Table 3.2 of the same report.
  • State rules: the current counting rules published by UAC, VTAC, QTAC, SATAC, TISC and TASC.

The method

  1. Your reported mark is placed within the published HSC distribution for that course to find your percentile position in the cohort.
  2. That percentile is read from the course’s published scaled distribution, giving a scaled mark on a one-unit basis out of 50.
  3. The state’s rules decide which units or subjects count, including the English requirement.
  4. The aggregate is converted to an ATAR with a shape-preserving interpolation through UAC’s published 2025 aggregate-to-ATAR points.

For Victoria, the study score is first converted to a percentile using the VCE scale (mean 30, standard deviation 7), because study scores are already standardised. For the other states, reported subject results are treated as standards-based marks, like HSC marks.

Why the estimate can be wrong

The largest source of error is not arithmetic. It is the future. Scaling is recalculated every year from the actual candidature, and the final ATAR depends on how everyone in your year performs. A tool that uses last year’s tables cannot know either.

There is also a structural gap outside New South Wales. We apply each state’s counting rules, but the course-level scaling distributions are UAC’s. Local cohorts differ, which is why results for other states are labelled indicative and shown with a wider range.

An estimate is a snapshot, not a verdict. This calculator is built for understanding: it shows how your marks, scaling and state rules combine, and gives you a realistic range to plan around. Your official ATAR remains the final word, but you can walk in with a much clearer picture.

What is not included

  • Adjustment factors, subject bonuses and equity schemes.
  • Course prerequisites and selection criteria.
  • Vocational qualifications, interstate study and IB conversions.
  • Accumulated or repeated study over multiple years.

Independence

This site is not affiliated with UAC, VTAC, QTAC, SATAC, TISC, TASC, the ACT Board of Senior Secondary Studies or any university. Data is attributed and linked so you can check it yourself. Your official ATAR comes only from the admissions centre in your state.

Privacy

No account is required, and no subject marks are transmitted or stored. See theprivacy page for the details of what the site and its hosting provider process.