How is the ATAR calculated?
6 min read ยท updated 2026-09-13
Every Australian state calculates the ATAR slightly differently, but the principle is identical everywhere: your final-year subject results are converted into scaled scores, combined into an aggregate from your best subjects, and then ranked as a percentile against everyone else in your age cohort. Here is the whole machine in plain English.
Step 1: subject results become scaled scores
In the final year, students complete their senior subjects โ VCE Units 3-4 in Victoria, HSC courses in NSW, General and Applied subjects in Queensland, and so on. Each subject result is then scaled by the state's tertiary admissions centre (VTAC, UAC, QTAC, SATAC, TASC) to account for different subject difficulty and cohort strength, so a strong result in a harder subject is not penalised.
Step 2: the best subjects become an aggregate
The admissions centre combines a student's best subjects into a single aggregate โ typically the English requirement plus the next three or four best subject results, with rules that vary by state. This is why subject selection in Year 10 matters: the subjects chosen determine which aggregate is even possible two years later.
Step 3: the aggregate becomes a percentile
Finally, aggregates are ranked against the state's whole age cohort (not just students still at school) and expressed as a percentile from 0 to 99.95, in increments of 0.05. An ATAR of 80.00 means a student performed better than 80% of their age cohort. There is no pass or fail โ the ATAR is purely a university-selection rank, and students not pursuing university follow the certificate route (VCE, HSC, QCE, WACE) without an ATAR at all.
FAQs
Is the ATAR calculated the same way in every state?๏ผ
The percentile outcome is national, but the inputs differ: each state's admissions centre (VTAC, UAC, QTAC, SATAC, TASC) scales and aggregates its own senior certificate results under its own rules. Queensland's ATAR is also newer than the rest, having replaced the OP system in 2020.
Do Year 11 results count toward the ATAR?๏ผ
Generally no โ the ATAR is built from final-year (Year 12) results, though the foundations are laid in Year 11 and each state has specific rules about which units count. Check your state's admissions centre for the exact subject-counting rules.
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