Subject Scaling Calculator & Guide

Scaling decides how much each subject counts towards your ATAR. Use the calculator to see what a scaling factor does to a score, then read the guide to understand which subjects tend to scale up or down — and why you should always check the current year’s scaling report.

ATAR Scaling Calculator

Enter a raw score and pick a scaling direction. The factor is your assumption — it is not an official value for any subject. Use it to understand how scaling moves a score, then check the official scaling report for the real figure.

How does scaling work?

Scaling adjusts each subject’s results so students can be compared fairly across different subjects. It is based on how strong the cohort was in that subject — if the students who took a subject also did very well in their other subjects, that subject usually scales up; if they did less well overall, it usually scales down. Scaling is recalculated every year from that year’s cohort, so last year’s scaling does not fix this year’s.

Worked example

Raw score 80 out of 100, with an assumed scaling factor of +4%: scaled score = 80 × 1.04 = 83.20. That +4% is only an illustration — the real factor for any subject comes from the official scaling report for your year.

VCE scaling

In Victoria, VTAC scales every VCE study score using the VCAA scaling report for that year. The report is published after results, and it lists the scaled score for every raw study score in every study. Use the VCE ATAR Calculator once you have scaled scores.

HSC scaling

In New South Wales, UAC scales HSC marks using its annual scaling report. The report shows how each course scaled that year. Use the HSC ATAR Calculator once you have scaled marks.

Subject questions — answered honestly

Does Psychology scale well? It varies by year and state. Check the current scaling report for Psychology — do not rely on an old figure.

Does Biology scale up or down? It varies by year. Biology has scaled differently in different years, so check the current report.

How much does Specialist Maths scale up? Specialist Mathematics has historically tended to scale up strongly, because its cohort is usually very strong — but the exact amount changes every year, and only the current scaling report gives the real number.

How much does Methods scale up? Mathematical Methods has also tended to scale up, for the same reason — but again, the amount varies year to year.

Does General Maths scale down? General Mathematics has tended to scale down, because its cohort is usually less strong on average — but check the current report for the exact figure.

Does Economics scale up? Does Accounting scale up? Does Business Management scale down? All three vary by year. Economics and Accounting have tended to scale up slightly in some years; Business Management has tended to scale down slightly in some years. None of these is fixed — check the current scaling report.

How much does Physics scale up? Does Chemistry scale up? Physics and Chemistry have tended to scale up in many years, but the amount changes with each cohort. The current scaling report is the only reliable source.

How much does English Language scale up? How much does Food Studies scale down? How much does PE scale down? How much does HHD scale down? These all vary by year and state. If a subject matters to your ATAR, look it up in the current scaling report rather than trusting a remembered number.

Best scaling subjects

There is no fixed list of “best scaling subjects”. The subjects that scale the most in any year are usually the ones with the strongest cohorts — often advanced mathematics and languages — but the order changes every year. Pick subjects you are good at and enjoy, not subjects you hope will scale well: a high raw score in a subject that scales down slightly usually beats a low raw score in a subject that scales up.

Last updated: November 2026.

Common mistakes

  • Comparing scaled scores across years. Scaling is recalculated every year from that year’s cohort. A subject that scaled up last year may scale down this year, so last year’s scaling report is a guide, not a promise.
  • Assuming scaling is fixed. Scaling is not a property of the subject — it reflects the strength of the students who took it that year. The same subject, the same raw score, and a different cohort can give a different scaled score.
  • Choosing subjects only for scaling. A subject that scales well is also a subject with a strong cohort, so you need a strong result to benefit. A high score in a subject you are good at almost always counts for more than a low score in a high-scaling subject.

Related calculators

VCE ATAR Calculator • HSC ATAR Calculator • QCE ATAR Calculator • WACE ATAR Calculator • SACE ATAR Calculator • Study Score Calculator • Main ATAR Calculator

FAQ

Scaling questions

Scaling adjusts each subject’s results for the strength of the cohort that took it, so results can be compared fairly across subjects. It is recalculated every year by the state authority — VTAC in Victoria, UAC in NSW, and the equivalent body in each other state.

For Victoria, the VCAA/VTAC scaling report; for NSW, the UAC scaling report; for Queensland, the QCAA scaling information; for Western Australia, the TISC scaling information. Each is published for your year — use the current one, not last year’s.

Usually not. Scaling rewards strong cohorts, so a subject that scales well is also a subject where you need a strong result to benefit. A high score in a subject you are good at almost always counts for more than a low score in a high-scaling subject.

People often ask “does psychology atar scale well” — it depends on the year and the cohort. Psychology scaling, like biology scaling and physics scaling, moves up or down with the strength of the students who take the subject. Check the current scaling report for your state and year rather than relying on last year’s numbers.