Trinity Grammar School
Updated Oct 2026 · ACARA 2025Summer Hill, New South Wales 2130 · Inner West LGA
#28 of 314 combined schools in NSW
#72 of 1,259 nationally
About Trinity Grammar School
Trinity Grammar School is an independent boys' combined (K–12) school located in Summer Hill, New South Wales (2130), within the Inner West local government area. It caters for students from K to 12 and in 2025 enrolled 2,296 students. The school is affiliated with Independent Schools NSW.
Trinity Grammar School has an ICSEA value of 1168, indicating exceptionally high socio-educational advantage, among the most advantaged school communities in Australia. That places it in the 98th percentile of Australian schools. 67% of students come from the top socio-educational quarter and 1% from the bottom quarter.
The school employs 266 teachers (254.7 full-time equivalent) and 188 non-teaching staff, giving a student-to-teacher ratio of about 9.0 to 1. Enrolments have grown by 6% over the past five years.
On the Success Index, Trinity Grammar School scores 82.2 out of 100, placing it in the top 10% of combined schools nationally and 28th of 314 combined schools in NSW (2nd of 5 in the Inner West area).
Success Index breakdown
Each component is a percentile against schools of the same type across Australia.
- Socio-educational advantage (ICSEA) (50%)ICSEA 1168
- Students in the top advantage quarter (15%)67% of students
- Teacher resourcing (students per teacher) (15%)9.0 students per teacher
- Enrolment growth vs local area (5 years) (10%)+6% enrolments since 2020 (area median +11%)
- ICSEA trend (5 years) (10%)+5 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 Trinity Grammar School's 2,296 students are spread across year levels in 2025.
Enrolment trend
How enrolments at Trinity Grammar School have changed over the past decade.
Free academic assessment
Is your child on track at Trinity Grammar School?
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Schools near Trinity Grammar School
Closest schools by straight-line distance, with their Success Index.
Yeo Park Infants School
Ashfield · Government primary · K-2
48 students · ICSEA 1144 · 451 m away
Summer Hill Public School
Summer Hill · Government primary · K-6
662 students · ICSEA 1167 · 564 m away
St Patrick's Catholic Primary School
Summer Hill · Catholic primary · K-6
163 students · ICSEA 1136 · 592 m away
St Paul of the Cross Catholic Primary School
Dulwich Hill · Catholic primary · K-6
118 students · ICSEA 1094 · 834 m away
Canterbury Boys High School
Canterbury · Government high school · 7-12
422 students · ICSEA 1018 · 956 m away
Ashfield Boys High School
Ashfield · Government high school · 7-12
751 students · ICSEA 1074 · 1.0 km away
Ashfield Public School
Ashfield · Government primary · K-6
474 students · ICSEA 1096 · 1.0 km away
Ashbury Public School
Ashbury · Government primary · K-6
356 students · ICSEA 1111 · 1.0 km away
Canterbury Girls High School
Canterbury · Government high school · 7-12
722 students · ICSEA 1059 · 1.2 km away
Dulwich Hill Public School
Dulwich Hill · Government primary · K-6
358 students · ICSEA 1099 · 1.2 km away
Similar schools
Independent combined schools in NSW with a comparable ICSEA.
Kambala
Rose Bay · Independent combined · K-12
986 students · ICSEA 1169
Barker College
Hornsby · Independent combined · K-12
2,856 students · ICSEA 1166
International Grammar School
Ultimo · Independent combined · K-12
1,224 students · ICSEA 1170
Loreto Normanhurst
Normanhurst · Independent combined · 5-12
1,240 students · ICSEA 1164
Queenwood
Mosman · Independent combined · K-12
816 students · ICSEA 1172
The Hills Grammar School
Kenthurst · Independent combined · K-12
1,208 students · ICSEA 1164
Frequently asked questions
Is Trinity Grammar School a public or private school?
Trinity Grammar School is a Independent school, which makes it a non-government (private) school affiliated with Independent Schools NSW.
What year levels does Trinity Grammar School offer?
Trinity Grammar School offers K to 12. It is classified by ACARA as a combined school.
How many students attend Trinity Grammar School?
In 2025, Trinity Grammar School had 2,296 enrolled students (0 girls, 2,296 boys), a change of 6% over five years.
What is the ICSEA of Trinity Grammar School?
Trinity Grammar School has an ICSEA (Index of Community Socio-Educational Advantage) of 1168. 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 Trinity Grammar School rank in NSW?
Trinity Grammar School ranks 28th of 314 combined schools in New South Wales on the Success Index (82.2/100), and 72nd of 1,259 nationally.
What is the student-to-teacher ratio at Trinity Grammar School?
Trinity Grammar School has about 9.0 students per full-time-equivalent teacher, based on 2025 ACARA staffing data.
How big is the Year 7 cohort at Trinity Grammar School?
In 2025, Trinity Grammar School had 273 students in Year 7 and 234 in Year 12.
Is Trinity Grammar School co-ed?
No. Trinity Grammar School is a boys' school.
What other schools are near Trinity Grammar School?
There are 10 other schools within 15 km of Trinity 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 Trinity Grammar School?
The closest Success Tutoring centre is Success Tutoring Burwood, about 3.9 km from the school. Success Tutoring offers a free academic assessment to identify your child's strengths and learning gaps before any sessions begin.