Understand what sits behind an ATAR forecast.
Plain English guides to school ranks, moderation, HSC marks, scaling and the limits of prediction.Follow the full path, from your school assessment rank to your final result.
Read the overviewWhy most ATAR calculators are useless before the HSC
A normal ATAR calculator needs HSC marks you do not have yet. Learn what it can and cannot tell you before the final exams.
Your trial mark is not the number UAC scales
Trial marks are school results. UAC calculates the ATAR from scaled marks derived from HSC results, not the percentage printed on your trial paper.
Rank 10 at two different schools can mean very different things
The same rank can sit inside very different cohort sizes, mark distributions and HSC exam performances.
You do not need to guess your HSC marks anymore
Start with your observed school ranks, then estimate a range of possible HSC marks before applying historical scaling.
What your current school ranks might mean for your ATAR
School ranks can inform an ATAR range, but they do not determine a final mark on their own.
Why entering an expected mark into an ATAR calculator is circular
If the hardest part is estimating your HSC marks, a calculator that asks you to supply those marks has not solved the prediction problem.
Three reasons your predicted ATAR could be wrong
A forecast can miss because your cohort changes, your exam performance changes, or historical scaling changes.
HSC mark vs ATAR: what is the difference?
An HSC mark is a course result. An ATAR is a rank across your age group. Learn how your marks contribute to it.
Does scaling lower your HSC mark?
Scaling can make a course mark lower or higher for ATAR calculation, but it does not change the HSC mark printed on your results.
How many HSC units count towards your ATAR?
Understand the 10-unit ATAR aggregate, the English requirement, and what happens when you study more than 10 eligible units.
Raw, aligned and scaled HSC marks explained
These terms describe different stages of HSC reporting and ATAR calculation. Here is what each mark means and who uses it.
How your HSC assessment rank is used in moderation
Your school assessment rank is not a final mark. See how NESA uses a course group’s exam results to moderate school assessments.
Why your ATAR is not your average HSC mark
Your ATAR is not calculated by averaging your HSC marks. It uses a 10-unit aggregate of scaled marks, then ranks candidates.
Should you choose HSC subjects based on scaling?
Scaling tables are not a subject-choice shortcut. Learn what they measure and how to weigh interests, strengths and prerequisites.
What is a good ATAR, and what does it actually mean?
An ATAR shows relative position, not a percentage score. What counts as a good result depends on your own goals and course requirements.
How to read an ATAR calculator estimate or range
Learn what a calculator result assumes, why two tools can differ, and how to use an estimate without mistaking it for a promise.
What happens to your HSC school rank after the exams?
Your school assessment rank remains part of moderation, but the course group’s HSC exam results help set the scale for assessment marks.
About these guides
Written by Kanishk Joshi, founder of ATAR Forecast. The guides connect official NESA and UAC explanations with the assumptions and limits of our forecasting tool.
Each guide links to relevant official sources. A source check date appears only where the article has been checked against those references. Examples are illustrative, not individual predictions. Send a correction.