St John's Grammar School
Updated Oct 2026 · ACARA 2025Belair, South Australia 5052 · Mitcham LGA
About St John's Grammar School
St John's Grammar School is an independent combined (K–12) school located in Belair, South Australia (5052), within the Mitcham local government area. It caters for students from R to 12 and in 2025 enrolled 1,009 students (474 girls and 535 boys). The school is affiliated with Association of Independent Schools of SA.
St John's Grammar School has an ICSEA value of 1141, indicating very high socio-educational advantage. That places it in the 94th percentile of Australian schools. 56% of students come from the top socio-educational quarter and 3% from the bottom quarter.
The school employs 98 teachers (81.8 full-time equivalent) and 84 non-teaching staff, giving a student-to-teacher ratio of about 12.3 to 1. Enrolments have grown by 30% over the past five years.
On the Success Index, St John's Grammar School scores 78.7 out of 100, placing it in the top 10% of combined schools nationally and 7th of 145 combined schools in SA (1st of 4 in the Mitcham area).
Success Index breakdown
Each component is a percentile against schools of the same type across Australia.
- Socio-educational advantage (ICSEA) (50%)ICSEA 1141
- Students in the top advantage quarter (15%)56% of students
- Teacher resourcing (students per teacher) (15%)12.3 students per teacher
- Enrolment growth vs local area (5 years) (10%)+30% enrolments since 2020 (area median +5%)
- ICSEA trend (5 years) (10%)+13 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 St John's Grammar School's 1,009 students are spread across year levels in 2025.
Enrolment trend
How enrolments at St John's Grammar School have changed over the past decade.
Free academic assessment
Is your child on track at St John's Grammar School?
Rankings tell you about a school community. A free Success Tutoring assessment tells you about your child: exactly where they are in English and Maths, where the gaps are, and a plan to close them. Small-group, Australian-curriculum tutoring with no lock-in contracts.
- Personalised learning plan mapped to the Australian Curriculum
- English & Maths from Kindergarten to Year 12
- Flexible memberships, no lock-in contracts
- Your nearest centre: Success Tutoring Windsor Gardens
Schools near St John's Grammar School
Closest schools by straight-line distance, with their Success Index.
Belair Primary School
Belair · Government primary · R-6
490 students · ICSEA 1117 · 973 m away
Scotch College
Torrens Park · Independent combined · R-12
1,213 students · ICSEA 1146 · 2.3 km away
Mercedes College
Springfield · Catholic combined · R-12
1,111 students · ICSEA 1133 · 2.4 km away
Clapham Primary School
Clapham · Government primary · U, R-6
243 students · ICSEA 1098 · 2.5 km away
Hawthorndene Primary School
Hawthorndene · Government primary · R-6
290 students · ICSEA 1108 · 2.6 km away
Mitcham Primary School
Kingswood · Government primary · R-6
629 students · ICSEA 1121 · 3.1 km away
Unley High School
Netherby · Government high school · 7-12
1,547 students · ICSEA 1084 · 3.2 km away
St Joseph's School
Kingswood · Catholic primary · R-6
256 students · ICSEA 1135 · 3.4 km away
Urrbrae Agricultural High School
Netherby · Government high school · 7-12
1,102 students · ICSEA 1074 · 3.5 km away
Colonel Light Gardens Primary School
Colonel Light Gardens · Government primary · R-6
688 students · ICSEA 1119 · 3.5 km away
Similar schools
Independent combined schools in SA with a comparable ICSEA.
Concordia College
Highgate · Independent combined · R-12
1,312 students · ICSEA 1140
Prince Alfred College
Kent Town · Independent combined · R-12
1,127 students · ICSEA 1143
Westminster School
Marion · Independent combined · R-12
1,401 students · ICSEA 1139
Emmaus Christian College
South Plympton · Independent combined · R-12
1,084 students · ICSEA 1137
Scotch College
Torrens Park · Independent combined · R-12
1,213 students · ICSEA 1146
Seymour College
Glen Osmond · Independent combined · R-12
715 students · ICSEA 1150
Frequently asked questions
Is St John's Grammar School a public or private school?
St John's Grammar School is a Independent school, which makes it a non-government (private) school affiliated with Association of Independent Schools of SA.
What year levels does St John's Grammar School offer?
St John's Grammar School offers R to 12. It is classified by ACARA as a combined school.
How many students attend St John's Grammar School?
In 2025, St John's Grammar School had 1,009 enrolled students (474 girls, 535 boys), a change of 30% over five years.
What is the ICSEA of St John's Grammar School?
St John's Grammar School has an ICSEA (Index of Community Socio-Educational Advantage) of 1141. The national average is 1000, so this indicates very high socio-educational advantage. ICSEA reflects the school community, not teaching quality.
How does St John's Grammar School rank in SA?
St John's Grammar School ranks 7th of 145 combined schools in South Australia on the Success Index (78.7/100), and 128th of 1,259 nationally.
What is the student-to-teacher ratio at St John's Grammar School?
St John's Grammar School has about 12.3 students per full-time-equivalent teacher, based on 2025 ACARA staffing data.
How big is the Year 7 cohort at St John's Grammar School?
In 2025, St John's Grammar School had 122 students in Year 7 and 93 in Year 12.
Is St John's Grammar School co-ed?
Yes. St John's Grammar School is a co-educational school enrolling both girls and boys.
What other schools are near St John's Grammar School?
There are 10 other schools within 15 km of St John's 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 St John's Grammar School?
The closest Success Tutoring centre is Success Tutoring Windsor Gardens, about 15 km from the school. Success Tutoring offers a free academic assessment to identify your child's strengths and learning gaps before any sessions begin.