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Very Good

#191 of 1,790 private schools in CA

Top 11% of private schools

Charles Armstrong School

Middle School

1405 SOLANA DR, Belmont, CA 94002

Private Estimated Score

Estimated academic score. This school does not have standardized test data. Based on CA statewide data. Learn more

Enrollment

224

Student-Teacher

5.1:1

Score

7.6

Grades

2nd – 8th

Updated 2021-22

How this school compares

In Belmont

#3 of 6

public schools

California middle schools

#4 of 45

About Charles Armstrong School

Charles Armstrong School serves 224 students in grades 2-8 in Belmont, California, earning an impressive 9.0 out of 10 rating from MySchoolScout and ranking #225 out of 1,790 California schools, placing it in the 88th percentile statewide. This public middle school stands out with an exceptionally low student-teacher ratio of 5.1:1, supported by 44 full-time equivalent teachers who can provide individualized attention to each student. The school operates as a regular public school in San Mateo County, offering a focused educational environment for students transitioning through their crucial middle school years.

With such a favorable student-to-teacher ratio, students benefit from small class sizes that foster personalized learning and strong teacher-student relationships. Charles Armstrong School is situated in Belmont's affluent 94002 ZIP code, where the median household income reaches $184,929 and median home values are $2,000,001. The surrounding community is highly educated, with 68% of residents holding bachelor's degrees or higher, and maintains a low poverty rate of 6.9%.

The school sits within this large suburban area that values education and provides a supportive environment for academic achievement, reflecting the community's commitment to quality education for its children.

What Parents Should Know

With a student-teacher ratio of 5.1:1, Charles Armstrong School offers a notably low ratio compared to the national average. This typically means smaller class sizes and more opportunities for one-on-one interaction between students and teachers.

As a private school, Charles Armstrong School operates independently from the local public school district. Families considering this school should inquire about tuition costs, financial aid availability, and the admissions process. Private schools are not required to follow the same curriculum standards as public schools, which can be either an advantage or a consideration depending on your priorities.

Financial Overview

Source: IRS Form 990 (2023 filing)

Per-Pupil Spending
Total expenses ÷ enrollment
$66,562
Per-Pupil Revenue
Total revenue ÷ enrollment
$65,416
Financial Health
Revenue-to-expense ratio (>1.0 = surplus)
0.98x — Tight
Tuition Dependency
Share of revenue from program services (tuition, fees)
87%
Total Assets
End-of-year total assets from IRS filing
$29.7M

Financial data from IRS Form 990 filings via ProPublica Nonprofit Explorer. Per-pupil figures based on current enrollment of 224 students. Not all private schools file Form 990.

Compare to Public Schools

Beta

How Charles Armstrong School compares to 5 public schools serving similar grades in Belmont, CA

Student-Teacher Ratio
5.1:1
This School
vs
24.6:1
Public Avg
Avg School Size
224
This School
vs
614
Public Avg
Avg School Scout Rating
7.6
This School
vs
7.3
Public Avg

Student Demographics

White 54.9% vs 0%
Hispanic 9.8% vs 0%
Black 2.2% vs 0%
Asian 1.8% vs 0%
Charles Armstrong School Belmont Public Avg

Nearby Middle Schools

School Rating
Charles Armstrong School (this school) 7.6
Central Elementary 8.0
Nesbit Elementary 4.6
Cipriani Elementary 8.0
Ralston Intermediate 8.4
Fox Elementary 7.3

Demographics sourced from NCES Private School Survey (PSS) and Common Core of Data (CCD). Comparisons are based on enrollment-weighted averages.

Score Breakdown

What This Rating Measures

This rating reflects classroom size, instructional time, student diversity, community resources, and school characteristics. Private schools are ranked against other private schools in CA.

Classroom Attention
? Student-teacher ratio calibrated against other private schools. Lower ratios mean more individual attention. (30% of overall score)
A 9.4 / 10
View breakdown
Student-Teacher Ratio 5.1:1
Instructional Commitment
? Total annual instructional hours based on school day length and days per year. (15% of overall score)
C+ 4.4 / 10
View breakdown
School Day Length 7 hours
Annual Instructional Hours 1,162
Diversity & Inclusion
? Racial and ethnic diversity of the student body using Simpson's diversity index. (20% of overall score)
B+ 6.9 / 10
View breakdown
Diversity Index 59%
Community Context

Data Unavailable

School Profile
? Enrollment size and grade span breadth — indicators of program depth and peer community. (15% of overall score)
A- 8.1 / 10
View breakdown
Enrollment 224
View data sources

Score basis: Private school model

Data coverage: 80% of scoring components had data

Components scored: 4 of 5

Ranking pool: Private schools in CA

Test Scores

Test score data not yet available for this school.

Student Demographics NCES PSS (SY 2021-22)

White 54.9%
Two or More 30.4%
Hispanic 9.8%
Black 2.2%
Asian 1.8%
Native American 0.9%

Source: NCES Private School Survey (PSS)

Location

1405 SOLANA DR, Belmont, CA 94002

Nearby Alternatives

Families considering Charles Armstrong School may also want to explore other middle schools in the area. Tierra Linda Middle (rated 9.0/10, 0.2 miles away, in nearby San Carlos), which scores notably higher. Additionally, Central Middle (rated 8.2/10, 1.4 miles away, in nearby San Carlos), which scores slightly higher. For more schools in Belmont, see our Belmont schools guide .

Nearby Schools

20 within 1.4 mi
School Distance Rating
Charles Armstrong School Belmont 0.0 mi
San Carlos Charter Learning Center San Carlos 0.1 mi 8.4
Tierra Linda Middle San Carlos 0.2 mi 9.0
Mariposa San Carlos 0.2 mi 9.4
NOTRE DAME HIGH SCHOOL Belmont 0.4 mi 5.6
Carlmont High Belmont 0.4 mi 9.1
NOTRE DAME ELEMENTARY SCHOOL Belmont 0.6 mi 7.2
Arundel Elementary San Carlos 0.7 mi 9.2
IMMACULATE HEART OF MARY SCHOOL Belmont 0.7 mi 7.8
Central Elementary Belmont 0.9 mi 8.0
BELMONT OAKS ACADEMY Belmont 0.8 mi 6.6
Belmont Oaks Academy Belmont 0.8 mi
Nesbit Elementary Belmont 1.1 mi 4.6
Heather Elementary San Carlos 1.3 mi 6.0
ST CHARLES SCHOOL San Carlos 1.3 mi 5.2
Serendipity School Belmont 1.2 mi
SERENDIPITY SCHOOL Belmont 1.2 mi 8.3
Cipriani Elementary Belmont 1.3 mi 8.0
Brittan Acres Elementary San Carlos 1.4 mi 9.2
Central Middle San Carlos 1.4 mi 8.2

Neighborhood Census ACS (2019-2023)

Census data for ZIP 94002 (ACS 2019-2023 5-Year Estimates) · Data sources

Median Income

$204,573

Median Home Value

$2,000,001

Median Rent

$2,889/mo

Population

27,730

College Educated

68.6%

Homeownership

56.2%

Avg Commute

29.4 min

Poverty Rate

6.6%

Median Age

40.4

Community Profile

The community surrounding Charles Armstrong School has a median household income of $204,573. It is a well-educated community where 69% of adults hold a bachelor's degree or higher. The median home value in the area is $2,000,001, with a median rent of $2,889/month. The local poverty rate of 6.6% is relatively low. The average commute for residents is 29 minutes. Source: U.S. Census ACS 2022 5-Year Estimates.

Similar Schools

Schools in the same state with comparable level, size, and ratings

School Rating
Sunset Bakersfield, CA 7.6
Walton Middle Compton, CA 7.6
College Connection Academy San Jose, CA 7.5
Fine Arts Academy Atascadero, CA 7.5
Fort Irwin Middle Yermo, CA 7.5
ICEF View Park Preparatory Middle Los Angeles, CA 7.5

Frequently Asked Questions

Common questions about Charles Armstrong School

What grades does Charles Armstrong School serve?

Charles Armstrong School serves students in grades 2nd through 8th.

How many students attend Charles Armstrong School?

Charles Armstrong School has an enrollment of approximately 224 students.

What is the student-teacher ratio at Charles Armstrong School?

The student-teacher ratio at Charles Armstrong School is 5.1:1. A lower ratio generally means more individual attention per student. The national average is approximately 11:1 for private schools.

How does Charles Armstrong School rank in CA?

Charles Armstrong School is ranked #191 out of 1,790 private schools in CA.

What is Charles Armstrong School's MySchoolScout rating?

Charles Armstrong School has a composite rating of 7.6 out of 10 on MySchoolScout. This score combines academic performance, student growth, and school environment into a single score. Equity data is shown separately for context.

Is Charles Armstrong School a private school?

Yes, Charles Armstrong School is a private coeducational school with a Nonsectarian affiliation. Private schools are not required to participate in state standardized testing, so academic performance data may be limited compared to public schools.

Is Charles Armstrong School a religious school?

No, Charles Armstrong School is a nonsectarian (non-religious) private school.

11 schools nearby View map →

Neighborhood Context

Walk Score
34 Car-Dependent
Bike Score
19 Somewhat Bikeable
City Safety
Elevated (1,452/100K)

Powered by Walk Score

FBI UCR 2024. City-level (Belmont). Data >1 year old.

Quick Facts NCES PSS (SY 2021-22)

Grades
2nd – 8th
Enrollment
224
Gender Split
53% M / 47% F
Student-Teacher Ratio
5.1:1
Teachers (FTE)
44
Type
private
Coed Status
coed
Affiliation
Nonsectarian
School Day
7 hours
Days Per Year
166 days
Setting
Large Suburb
County
SAN MATEO
Data Year
2022–2023

How We Rate Schools

Every school receives a composite score from 1 to 10 based on four pillars: Academic Performance (50%), Student Growth (20%), Equity (15%), and Learning Environment (15%). Scores are built from publicly available data including standardized test results, enrollment figures, and school climate indicators.

Read our full methodology

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