Unit scores → course scores → AST-scaled aggregate → estimated ATAR range
Illustrative model outputs, not an official BSSS scaling table. Actual scaling varies by cohort and year; do not use these numbers to select subjects.
These are illustrative figures, not verified admission cut-offs or guaranteed offers. Requirements vary by course, year and selection rank adjustments. Always verify at uac.edu.au.
Estimates only. Actual ATARs are calculated by UAC using cohort-specific AST scaling that changes each year. The model uses illustrative scaling and aggregate conversion assumptions; it cannot reproduce official BSSS/UAC results. Not affiliated with BSSS, UAC, or any ACT school. For official information, visit bsss.act.edu.au and uac.edu.au.
The BSSS ATAR is calculated by UAC using your unit scores (0–130) from each T-course. These are combined into a course score, scaled using AST (ACT Scaling Test) cohort data, then summed as your best 3 major course scores plus 0.6 of your next best course to form an aggregate. That aggregate is converted to an ATAR between 30.00 and 99.95. Because the exact AST scaling factor changes every year and isn't published, this calculator — and any calculator like it — can only ever give an estimate, which is why results are shown as a range.
Our BSSS ATAR Calculator helps ACT Year 12 students estimate their Australian Tertiary Admission Rank. Enter your unit scores for each T-course major and minor, and the calculator computes your course scores, applies approximate AST scaling, and produces your aggregate and an estimated ATAR range — all in real time.
The ACT ATAR is calculated by UAC (Universities Admissions Centre) and is aligned to the NSW scale. Here is the complete process:
The AST (ACT Scaling Test) is a standardised assessment held in Year 12 Term 3. It does not appear as a mark in your ATAR — instead, BSSS uses aggregate AST results from your school's scaling group to moderate course scores, so results are comparable regardless of which school you attended. AST performance contributes to scaling, but its effect cannot be estimated reliably with one multiplier.
| Estimated ATAR | Approx. Aggregate |
|---|---|
| 99.95 | ~380+ |
| 99.00 | ~335 |
| 95.00 | ~305 |
| 90.00 | ~278 |
| 85.00 | ~257 |
| 80.00 | ~238 |
| 70.00 | ~203 |
| 60.00 | ~172 |
The ACT ATAR is calculated by UAC, aligned to the NSW scale. BSSS records a unit score (0–130) for each semester of a T-course, combines these into a course score, then scales that course score using AST cohort data. Your aggregate equals the best 3 scaled major course scores plus 0.6 of your next best course. UAC ranks all ACT aggregates to produce an ATAR from 30.00 to 99.95.
A major is 4 units of a T-course (~200 hours). A minor is 2 units (~100 hours). Only majors can occupy the top-3 contributing positions (100% weight). A minor or 4th major contributes at 0.6 weight as the final aggregate component.
The AST is used to scale course scores across schools. AST performance is one input to scaling; its effects vary and cannot be predicted from a simple school-wide multiplier. The AST itself doesn't appear directly in your aggregate — it's a moderation tool, not a graded subject.
Scaling depends on cohort performance and the BSSS process. The calculator uses illustrative subject assumptions rather than verified annual course-by-course scaling tables. Choose subjects based on your strengths and course prerequisites.
Illustrative course ATAR figures (not verified 2026 cut-offs): Medicine 99.00+, Law 96.00+, Commerce/Economics 88.00+, Engineering 85.00+, and Computer Science 82.00+. Always confirm current cut-offs directly with ANU or UAC, since they move year to year.