St John's Grammar School is an independent co-ed school set across multiple campuses in the Belair National Park area.
NAPLAN modestly above national year-level averages and a median ATAR of 87.0; the result is a B overall.
St John's Grammar School is an independent co-ed school set across multiple campuses in the Belair National Park area. The school offers academic and general excellence scholarships, and runs strong music, drama, and visual arts programs with dedicated scholarships available. It is known for its string and woodwind ensembles. Learning support is comprehensive. The school operates with a progressive, inquiry-led approach and fosters a tight-knit community. It suits families drawn to creative pathways alongside rigorous academics, and those valuing a more connected school culture.
St John's Grammar School is also known as SJGS and SJGS Belair.
Median ATAR 87.0 ranks #6 of 8 South Australia schools. Within South Australia Independent schools, ranks #3 of 5.
42.0% of students achieved ATAR ≥ 90 — #5 of 11 South Australia schools.
St John's Grammar School has an overall SchoolRank score of 58.2/100, rated "Average". This score is calculated from academic results, student growth, wellbeing, programs, and value for money. Academically, the school grades B+ (Good) against other Australian schools. The school's ICSEA (Index of Community Socio-Educational Advantage) is 1141 (94th percentile; the national average is 1,000).
In 2025 NAPLAN testing at St John's Grammar School, Year 3 students averaged 425 across the tested NAPLAN domains, above the national average of 407 for that year level, and Year 5 students averaged 505, above the national average of 490 for that year level, and Year 7 students averaged 553, above the national average of 540 for that year level, and Year 9 students averaged 605, above the national average of 569 for that year level. Relative to national year-level averages, the school's strongest domain is Writing. National averages are specific to each year level, because NAPLAN scores are scaled so older year levels score higher. A school-wide average can't be compared with a single national figure.
St John's Grammar School is a large Independent combined school with approximately 1,009 students. It offers education for years R-12. As an Independent school, enrolment typically involves an application process. Contact the school directly for enrolment criteria, waiting lists, and open day information.
St John's Grammar School has a student-to-teacher ratio of 12.3:1. This is below the national average of approximately 14:1, meaning students generally receive more individual attention. Support staff make up 33% of the workforce, providing additional learning assistance and pastoral care. The student attendance rate is 92%, which is good.
St John's Grammar School has a median ATAR of 87.0. The top ATAR was 99.50. 42% of students achieved an ATAR above 90.
St John's Grammar School is located in Belair, SA, in a major city. Its ICSEA is 1141 (94th percentile; the national average is 1,000). ICSEA measures the advantage of a school's community, from its parents' education and occupation, not the school's quality. A school with a lower ICSEA and strong academic results may be teaching particularly effectively.