Knox Grammar School
Updated Oct 2026 · ACARA 2025Wahroonga, New South Wales 2076 · Ku-ring-gai LGA
About Knox Grammar School
Knox Grammar School is an independent combined (K–12) school located in Wahroonga, New South Wales (2076), within the Ku-ring-gai local government area. It caters for students from K to 12 and in 2025 enrolled 3,345 students (73 girls and 3,272 boys). The school is affiliated with Independent Schools NSW.
Knox Grammar School has an ICSEA value of 1187, indicating exceptionally high socio-educational advantage, among the most advantaged school communities in Australia. That places it in the 99th percentile of Australian schools. 77% of students come from the top socio-educational quarter and 1% from the bottom quarter.
The school employs 307 teachers (291.6 full-time equivalent) and 426 non-teaching staff, giving a student-to-teacher ratio of about 11.5 to 1. Enrolments have grown by 8% over the past five years.
On the Success Index, Knox Grammar School scores 82.8 out of 100, placing it in the top 5% of combined schools nationally and 24th of 314 combined schools in NSW (4th of 9 in the Ku-ring-gai area).
Success Index breakdown
Each component is a percentile against schools of the same type across Australia.
- Socio-educational advantage (ICSEA) (50%)ICSEA 1187
- Students in the top advantage quarter (15%)77% of students
- Teacher resourcing (students per teacher) (15%)11.5 students per teacher
- Enrolment growth vs local area (5 years) (10%)+8% enrolments since 2020 (area median +11%)
- ICSEA trend (5 years) (10%)+17 ICSEA points since 2020
The Success Index summarises the academic environment of a school community using official ACARA data. It is not a measure of teaching quality or student results. Read the methodology.
Student profile
Distribution of students across socio-educational advantage (SEA) quarters, plus community characteristics.
Enrolments by year level
How Knox Grammar School's 3,345 students are spread across year levels in 2025.
Enrolment trend
How enrolments at Knox Grammar School have changed over the past decade.
Free academic assessment
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Schools near Knox Grammar School
Closest schools by straight-line distance, with their Success Index.
St Lucy's School
Wahroonga · Independent special · U
246 students · ICSEA 1104 · 660 m away
Warrawee Public School
Turramurra · Government primary · K-6
622 students · ICSEA 1170 · 728 m away
Abbotsleigh
Wahroonga · Independent combined · K-12
1,634 students · ICSEA 1217 · 828 m away
Prouille Catholic Primary School
Wahroonga · Catholic primary · K-6
262 students · ICSEA 1156 · 838 m away
Wahroonga Public School
Wahroonga · Government primary · K-6
508 students · ICSEA 1156 · 1.2 km away
St Edmund's College
Wahroonga · Independent special · U
112 students · ICSEA 1107 · 1.2 km away
St Leo's Catholic College
Wahroonga · Catholic high school · 7-12
1,055 students · ICSEA 1113 · 1.6 km away
Normanhurst Boys High School
Normanhurst · Government high school · 7-12
752 students · ICSEA 1207 · 1.7 km away
Loreto Normanhurst
Normanhurst · Independent combined · 5-12
1,240 students · ICSEA 1164 · 1.7 km away
Our Lady of the Rosary Catholic Primary School
Waitara · Catholic primary · K-6
337 students · ICSEA 1153 · 1.7 km away
Similar schools
Independent combined schools in NSW with a comparable ICSEA.
Wenona School
North Sydney · Independent combined · K-12
1,385 students · ICSEA 1187
Emanuel School
Randwick · Independent combined · K-12
849 students · ICSEA 1186
Loreto Kirribilli
Kirribilli · Independent combined · K-12
1,176 students · ICSEA 1189
St Andrew's Cathedral School
Sydney · Independent combined · K-12
1,436 students · ICSEA 1189
Ravenswood School for Girls
Gordon · Independent combined · K-12
1,451 students · ICSEA 1185
SCECGS Redlands
Cremorne · Independent combined · K-12
1,680 students · ICSEA 1190
Frequently asked questions
Is Knox Grammar School a public or private school?
Knox Grammar School is a Independent school, which makes it a non-government (private) school affiliated with Independent Schools NSW.
What year levels does Knox Grammar School offer?
Knox Grammar School offers K to 12. It is classified by ACARA as a combined school.
How many students attend Knox Grammar School?
In 2025, Knox Grammar School had 3,345 enrolled students (73 girls, 3,272 boys), a change of 8% over five years.
What is the ICSEA of Knox Grammar School?
Knox Grammar School has an ICSEA (Index of Community Socio-Educational Advantage) of 1187. The national average is 1000, so this indicates exceptionally high socio-educational advantage, among the most advantaged school communities in Australia. ICSEA reflects the school community, not teaching quality.
How does Knox Grammar School rank in NSW?
Knox Grammar School ranks 24th of 314 combined schools in New South Wales on the Success Index (82.8/100), and 67th of 1,259 nationally.
What is the student-to-teacher ratio at Knox Grammar School?
Knox Grammar School has about 11.5 students per full-time-equivalent teacher, based on 2025 ACARA staffing data.
How big is the Year 7 cohort at Knox Grammar School?
In 2025, Knox Grammar School had 380 students in Year 7 and 376 in Year 12.
Is Knox Grammar School co-ed?
Yes. Knox Grammar School is a co-educational school enrolling both girls and boys.
What other schools are near Knox Grammar School?
There are 10 other schools within 15 km of Knox Grammar School in our database. Scroll up to the "Nearby schools" section to compare them by Success Index, ICSEA and enrolments, or use the Compare tool.
Where can I get tutoring near Knox Grammar School?
The closest Success Tutoring centre is Success Tutoring Hornsby, about 3.2 km from the school. Success Tutoring offers a free academic assessment to identify your child's strengths and learning gaps before any sessions begin.