Type
Day
School
Commonwealth School
Siviq Rank#81Boston, MA • Day
Day
Enrollment
163
Student-Teacher Ratio
5:1
Admit Rate
-
Reach
Limited Evidence
Narrative
Profile Notes
Summary
Commonwealth School is an independent day school in Boston serving 163 students in grades 9–12. The 2025–2026 profile reports an average SAT of 1470 and average ACT of 33 for the Class of 2026, no class rank, weighted GPAs on transcripts, and discretionary disciplinary reporting to colleges.
Advanced Coursework
Most Honors (H) and all Advanced Placement (AP) courses are taught at the college level. AP equivalent (APE) courses have rigor that is equivalent to or surpasses AP requirements.
Matriculation Notes
In the Class of 2025, 100% of those who applied were admitted to four-year colleges and universities.
Siviq Layer
Siviq Scores
Siviq Scores
Precomputed percentiles relative to similar schools. These scores are descriptive rather than judgmental.
Academic Program
89th percentile
Higher reported academic program than 89% of similar schools.
Combines advanced-course offerings, testing, and reported honors or IB signals.
Average Class Size
69th percentile
Lower reported average class size than 69% of similar schools.
Smaller reported average classes score higher within each peer cohort.
Institutional Resources
21st percentile
Higher reported institutional resources than 21% of similar schools.
Uses linked nonprofit financial capacity when a reviewed EIN match is available.
Outcomes
25th percentile
Higher reported outcomes than 25% of similar schools.
Based on the reported outcomes evidence available for this school.
Reach & Access
22nd percentile
Higher reported reach & access than 22% of similar schools.
Combines geographic reach and reported access signals from the current school data.
Student Experience
67th percentile
Lower reported student experience than 67% of similar schools.
Lower student-teacher ratios score higher within each peer cohort.
Standardized Data
Profile
Profile
Overview
- Grades Served
- 9
- Day Enrollment
- 163
Profile
Academics
- Honors Program
- Yes
- Average SAT
- 1,470
- Average ACT
- 33
Profile
Student Body
- Students of Color
- 63%
Profile
Policies
- Class Rank Policy
- Commonwealth School does not rank its students.
- Weighted Grades
- Yes
- Weighted Grades Policy
- Weighted GPA: add (1) for AP and APE courses and (.5) for Honors courses. Weighted and Unweighted GPAs are included on each transcript.
- Disciplinary Reporting
- When colleges ask for information about a student’s high-school disciplinary record, we will disclose at our discretion and ask the student to disclose accordingly.
Linked Nonprofit Data
Nonprofit Financials
Net Assets
$41,257,874
Tax year 2024
Net Income
$786,732
Latest revenue minus expenses from the school's nonprofit filing.
Total Expenses
$11,165,927
Tax year 2024
Expenses Per Student
$68,503
Calculated from total expenses divided by the current school-profile enrollment.
Location Context
Nearest
External References
Links
Search & Answers
Commonwealth School Frequently Asked Questions
What is the student-teacher ratio at Commonwealth School?
The current school profile does not publish a normalized student-teacher ratio for Commonwealth School.
How many students are enrolled at Commonwealth School?
The current school profile reports about 163 students enrolled at Commonwealth School.
What grades does Commonwealth School offer?
Commonwealth School currently reports serving grades 9&ndash.
Where is Commonwealth School located?
Commonwealth School is located in Boston, MA.
Is Commonwealth School a day school or a boarding school?
Commonwealth School is a day school.
What is the nearest commercial airport to Commonwealth School?
The closest commercial airport in the current location enrichment is Boston Logan International Airport (BOS) about 4 miles away.
What is the nearest major city to Commonwealth School?
The current location enrichment points to Boston • MA • about 1 miles away as the nearest major city for Commonwealth School.
By Geography
Nearby Schools
By Similarity
Similar Schools
Provenance
Sources
| Source | Type | Checked | Metrics |
|---|---|---|---|
| 2025-2026 School Profile (PDF) Used for normalized profile metrics, school facts, FAQ answers, and school SEO metadata. | School Profile PDF | Apr 02, 2026 | Academic Rigor Category • Access Category • Advanced Course Notes • Average ACT • Average Class Size • Average SAT • More normalized profile fields |
| 2025-2026 school profile PDF resources.finalsite.net/images/v1757524416/commonwealth/i9qogwailwge6b64wb65/Commonwealth-School-Profile.pdf | Official Linked File | May 12, 2026 | Day Enrollment |
| Snapshot of Commonwealth School | Coed Independent Day School in Boston www.commschool.org/about/quick-facts | Official Website Page | May 12, 2026 | Average Class Size • Faculty Count |
| Commonwealth School | Boston's High School for Uncommon Students www.commschool.org | Official Website Page | Apr 05, 2026 | Grades Served • Student-Teacher Ratio • Students of Color |
Sources & Data QualityMirrored artifacts, website inventory, and normalization review notes for this school profile.
Source Links
Known Website Addresses
| Role | URL | Method |
|---|---|---|
| official_website | www.commschool.org/about/at-a-glance | supplemental_backfill |
| official_website | www.commschool.org/about/facts | supplemental_backfill |
| official_website | www.commschool.org/about/fast-facts | supplemental_backfill |
| Private High School with Strong Academic Programs - Commonwealth | www.commschool.org/academics | supplemental_backfill |
| High School - Great College Placements Commonwealth School, Boston MA | www.commschool.org/academics/college-counseling | supplemental_backfill |
| official_website | www.commschool.org/admission | supplemental_backfill |
| Boston Private High School Admissions & Aid - Commonwealth School | www.commschool.org/admissions-aid | supplemental_backfill |
| Student Life - Benefits of a Private High School | Commonwealth | www.commschool.org/student-life | supplemental_backfill |
| official_website | www.commschool.org/tuition-and-financial-aid | supplemental_backfill |
| High School with College-Level Faculty - Commonwealth School | www.commschool.org/academics/college-counseling/school-profile | override |
| 2025-2026 school profile PDF | resources.finalsite.net/images/v1757524416/commonwealth/i9qogwailwge6b64wb65/Commonwealth-School-Profile.pdf | override |
| Faculty & Staff Directory - Commonwealth School - Boston | www.commschool.org/about/faculty-staff | supplemental_backfill |
| Snapshot of Commonwealth School | Coed Independent Day School in Boston | www.commschool.org/about/quick-facts | supplemental_backfill |
| Commonwealth School | Boston's High School for Uncommon Students | www.commschool.org | override |
| 2025-2026 school profile PDF | www.commschool.org/fs/resource-manager/view/c160a736-2383-41ea-8d67-27993c582ac8 | override |
| Why Attend Our Private High School in Boston | Commonwealth School | www.commschool.org/about | supplemental_backfill |
| Meet Our Board of Trustees - Commonwealth School, Boston MA | www.commschool.org/about/board-of-trustees | supplemental_backfill |
| Welcome from the Head of Commonwealth School - Private School in Boston | www.commschool.org/about/head-of-school | supplemental_backfill |
| Mission | Commonwealth School | www.commschool.org/about/mission-and-values | supplemental_backfill |
All Canonical Metrics
| Metric | Value | Evidence |
|---|---|---|
| Grades Served | 9 | grades 9&ndash |
| Lowest Grade | 9 | grades 9–12 |
| Highest Grade | 12 | grades 9–12 |
| Postgraduate Offered | - | grades 9–12 |
| Boarding Status | Day | Commonwealth School, an independent day school for 163 students in grades 9–12 |
| Boarding Status Code | day | Day |
| School Type | Private | Commonwealth School, an independent day school for 163 students in grades 9–12 |
| School Type Code | private | Private |
| Enrollment | 163 | Commonwealth School, an independent day school for 163 students in grades 9–12 |
| Residential Enrollment | - | - |
| Day Enrollment | 163 | Commonwealth School, an independent day school for 163 students in grades 9–12 |
| Student-Teacher Ratio | 5 | 5:1 student-to-faculty ratio |
| Founded Year | - | - |
| School Leadership | - | - |
| Key Contacts | - | - |
| Accreditations | - | - |
| School Codes | - | - |
| AP Courses | - | - |
| Average Class Size | 10 | Academics and Outcomes: 10 students per class on average |
| IB Program | - | - |
| Honors Program | Yes | Course Offerings and Progression Most Honors (H) and all Advanced Placement (AP) courses are taught at the college level. |
| Advanced Course Notes | Most Honors (H) and all Advanced Placement (AP) courses are taught at the college level. AP equivalent (APE) courses have rigor that is equivalent to or surpasses AP requirements. | Most Honors (H) and all Advanced Placement (AP) courses are taught at the college level. AP equivalent (APE) courses have rigor that is equivalent to or surpasses AP requirements. |
| Faculty Count | 40 | 40 faculty members |
| College Counseling Summary | - | - |
| Testing Policy | - | - |
| Testing Policy Code | - | - |
| Average SAT | 1470 | The average SAT score for the Class of 2026 is 1470 |
| Average ACT | 33 | the average composite ACT score for the Class of 2026 is 33 |
| Matriculation Summary | In the Class of 2025, 100% of those who applied were admitted to four-year colleges and universities. | In the Class of 2025, 100% of those who applied were admitted to four-year colleges and universities. |
| Top Colleges | - | - |
| States Represented | - | - |
| Countries Represented | - | - |
| Students of Color | 63 | 63% self-identified students of color |
| International Students | - | - |
| Receiving Financial Aid | - | - |
| Tuition-Free Share | - | - |
| Applicants | - | - |
| Admitted | - | - |
| Matriculated | - | - |
| Admit Rate | - | - |
| Yield Rate | - | - |
| Class Rank Policy | Commonwealth School does not rank its students. | Ranking Commonwealth School does not rank its students. |
| Class Rank Policy Code | - | Commonwealth School does not rank its students. |
| Weighted Grades | Yes | Weighted GPA: add (1) for AP and APE courses and (.5) for Honors courses. Weighted and Unweighted GPAs are included on each transcript. |
| Weighted Grades Policy | Weighted GPA: add (1) for AP and APE courses and (.5) for Honors courses. Weighted and Unweighted GPAs are included on each transcript. | Weighted GPA: add (1) for AP and APE courses and (.5) for Honors courses. Weighted and Unweighted GPAs are included on each transcript. |
| Disciplinary Reporting | When colleges ask for information about a student’s high-school disciplinary record, we will disclose at our discretion and ask the student to disclose accordingly. | When colleges ask for information about a student’s high-school disciplinary record, we will disclose at our discretion and ask the student to disclose accordingly. |
| Boarding Model | day_only | day_only |
| Selectivity Category | selective | selective |
| Academic Rigor Category | very_high | very_high |
| Testing Policy Category | not_reported | not_reported |
| College Counseling Category | not_reported | not_reported |
| Student Body Reach Category | limited_evidence | limited_evidence |
| Access Category | limited_evidence | limited_evidence |
| Outcome Category | reported_outcomes | reported_outcomes |
| Signals | - | Independent day school for 163 students in grades 9–12; Average SAT for the Class of 2026 is 1470; Average ACT for the Class of 2026 is 33; Most Honors and all AP courses are taught at the college level; AP equivalent courses have rigor equivalent to or exceeding AP requirements; 85% of AP scores were 4 or 5; 96% were 3 or above; Upper-level math includes Theoretical Calculus and Axiomatic Set Theory; Students complete three long primary-source research papers; Selected seniors may complete an independent research Capstone; Admissions rate and applicant volume are not reported; Testing policy is not reported; College counseling summary is not reported; States represented and countries represented are not reported; Financial-aid participation is not reported; Class of 2025: 100% of those who applied were admitted to four-year colleges and universities; Top college destinations are not reported |