HSC Biology Scaling 2026 — Free Calculator

Your HSC Biology mark (out of 100)

/ 100

Enter a mark between 0 and 100.

Estimated scaled mark

0.0 / 50

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Scales around the middle vs other subjects

Subject median: 26.7/50

Estimate based on UAC's 2025 percentiles for Biology. Your official scaled mark is set by UAC and released with your ATAR in December.

Quick answers

How is HSC Biology scaled?

UAC scales your raw Biology mark against how the whole Biology cohort performs across all of their subjects. A strong cohort lifts a subject; a broader one lowers it. Biology's average scaled mark is about 26.2/50 per unit versus roughly 25 across all subjects, so it sits around the middle.

Does Biology scale up or down?

Relative to other subjects, Biology sits around the middle. Its cohort's average scaled mark is about 26.2/50 per unit, against about 25 across the whole state. HSC marks are reported high. Most students sit in Bands 4 to 6. So scaled marks come out lower than HSC marks in almost every subject. What matters is how a subject's scaled marks compare with others. The raw drop in the number is not the point.

What's a good HSC Biology mark?

The median student scores about 75, which scales to roughly 26.7/50. Beat that and you're in the top half of the cohort; a mark in the top 10% sits near 88.

What raw mark do I need for a Band 6 in Biology?

A Band 6 is an HSC (aligned) mark of 90–100 out of 100. It's set each year when NESA aligns raw marks to standards, so the exact raw mark moves year to year. This tool estimates your scaled mark, which is what actually feeds your ATAR.

Reference

HSC Biology scaling table (2025 data)

Approximate scaled mark and percentile for a given HSC Biology mark, from UAC's 2025 report. Scaled marks are shown per unit (out of 50).

HSC mark (/100)	Scaled mark (/50)	Percentile
50	13.6 /50	19th
60	16.4 /50	23th
70	21.9 /50	36th
80	31.8 /50	66th
90	41.7 /50	93th
100	50.0 /50	99th+

Source: UAC — Preliminary Report on the Scaling of the 2025 NSW HSC, Table A3. Updated February 2026.

How it works

From raw mark to scaled mark

STEP 1

Enter your mark

Type your raw or predicted HSC Biology mark out of 100. Predicted is fine before results day.

STEP 2

UAC scaling applied

Your mark is mapped onto UAC's 2025 scaling curve for Biology, drawn from the official percentiles.

STEP 3

See your scaled mark

Get your estimated scaled mark out of 50, your percentile, and how Biology scales versus other subjects.

About this HSC Biology scaling calculator

This tool estimates the scaled mark you'd receive in HSC Biology from your raw HSC mark, using UAC's Preliminary Report on the Scaling of the 2025 NSW HSC — the most recent official scaling data. It's the same source behind our NSW ATAR calculator, so your Biology scaled mark here lines up with your full ATAR estimate there.

In 2025, Biology sits around the middle relative to other subjects: its average scaled mark was about 26.2/50 per unit, versus roughly 25 across the whole state — close to the state average. HSC marks are reported high. Most students sit in Bands 4 to 6. So scaled marks come out lower than HSC marks in almost every subject. What matters is how a subject's scaled marks compare with others. The raw drop in the number is not the point. Scaling isn't a measure of how “hard” the subject is; it reflects how the Biology cohort performs across all of their subjects. So two students with the same scaled mark would rank equally. That holds even across different subjects. It assumes every student had sat both.

One point to be clear about. UAC says there is no single scaled mark for a given HSC mark. Each HSC mark can come from a small range of raw marks. So read this as a close estimate for planning, not an exact figure. To see how Biology combines with your other subjects, use the NSW ATAR calculator; to compare subjects, browse all HSC scaling calculators or read our methodology.

HSC Biology scaling — common questions

I got 90 in HSC Biology — what scaled mark is that?

A raw HSC mark of 90 in Biology scales to roughly 42 out of 50 (a per-unit scaled mark). For comparison, a raw 80 scales to about 32, and a raw 95 to about 46. These are estimates from the latest UAC scaling pattern — the exact figure shifts a little each year with the cohort.

Does HSC Biology scale up or down?

Biology sits around the middle. Its median scaled mark is about 27/50, close to the roughly 25/50 state average. It doesn't give the scaling lift of subjects like Chemistry or the higher maths, but it doesn't penalise you the way the lowest-scaling subjects do either.

Why is my scaled mark lower than my HSC mark in Biology?

Because the two numbers measure different things. Your raw HSC mark (out of 100) is aligned to performance bands; your scaled mark (out of 50 per unit) places you against every student in the state on one common scale, adjusted for how strong the Biology cohort is. A raw 90 in Biology, for instance, becomes about 42/50. Scaled marks sitting below raw HSC marks in the middle of the range is normal and happens in nearly every subject.

What raw mark do I need in Biology for a scaled mark of 40?

A scaled mark of about 40/50 is a strong contribution to your ATAR aggregate. In Biology, reaching it takes a raw HSC mark of roughly 88 out of 100. Lifting your raw mark above that pushes your scaled mark higher still, up to about 50/50 at the very top.

Is HSC Biology worth taking for a high ATAR?

Biology won't give you a big scaling boost, but it won't hold you back much either. The deciding factor should be whether you can score highly in it — a strong mark in Biology beats a weak mark in a higher-scaling subject every time.

What scaled mark is a Band 6 in Biology?

A Band 6 in Biology starts at a raw HSC mark of 90, which scales to about 42/50. The very top of the band (a raw 100) scales to roughly 50/50. So even within Band 6 there's a real scaled-mark gap between a 90 and a 100.

What HSC mark puts me in the top 10% of Biology?

Roughly the top 10% of Biology students score a raw HSC mark of about 88 or higher. Your position within the cohort is what drives your scaled mark — the stronger your rank, the higher your scaled result.

How is HSC Biology scaled for the ATAR?

UAC scales your Biology marks (exam plus moderated assessment) so they compare fairly with every other subject. The scaling reflects how academically strong the Biology cohort is — the stronger the field, the higher the subject scales. It's your scaled marks, not your raw HSC marks, that feed into your ATAR aggregate.

HSC Biology scaling — see your scaled mark in seconds.