ATAR calculator (NSW)
Put in your HSC marks, or the marks you're expecting. You'll see each subject's scaled mark, which units count, your aggregate and an estimated ATAR, then exactly what it takes to reach your target.
2-unit subjects are out of 100; 1-unit extensions are out of 50. Extension 2 Maths: put in Extension 1 and Extension 2. Subject names are UAC's: every Industrial Technology focus area is "Industrial Technology"; VET courses are the "Exam" ones. Health and Movement Science is first examined in 2026, so it's estimated from PDHPE until UAC publishes its scaling.
What do I need?
Lift the subject that's holding you back
Every extra mark in a subject that scales well moves your ATAR more. Practise real HSC questions and get them marked in seconds.
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What's a scaled mark?
UAC adjusts each subject's marks so they can be compared across subjects. Your HSC mark is placed among everyone who sat that subject, then given the scaled mark at the same position. That's why the same HSC mark scales differently in different subjects.
How is the ATAR worked out?
Your best 10 units of scaled marks are added up (at least 2 units must be English), giving an aggregate out of 500. That aggregate is matched to an ATAR, which is your rank among all Year 12s in your age group.
How accurate is it?
It's an estimate built from last year's scaling (the 2025 HSC). Scaling is worked out again every year from that year's students, so your real ATAR can be a few points either way. Small subjects are less predictable.
Years 7 to 10?
Use the grade calculator: your assessment marks in, your A to E grade out, and what you need on the rest of your tasks.
Estimates use figures from UAC's Report on the Scaling of the 2025 NSW HSC. ATAR is a registered trademark of VTAC. Study Decoder is not affiliated with UAC or NESA.