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Cost & Financial Aid

Annual Tuition

  • St. Catherine's2,056,000 (2026-27 rate · 9th grade; grades 10-12: $20,753)
  • St. Thomas2,790,000 (2026-27 rate)
  • Duchesne3,360,000 (2026-27 rate · Upper School)
  • O'Connell910,000 (2025-26 rate (newest published))

Merit Scholarships

  • St. Catherine'sNot published
  • St. ThomasYes (Academic Scholarship Program (ISEE-based), Gabel Scholarship (80% tuition, ~2/yr), Basilian Fathers', Principal's/Aquinas scholarships (GPA-renewable). Sibling discount $2,000/yr after first.)
  • DuchesneYes ($15,000/yr renewable: Janet Erskine Stuart (Catholic middle-schoolers), Madeleine Sophie Barat (continuing Duchesne 8th), Rose Philippine Duchesne (incoming 9th, other schools))
  • O'ConnellYes (Merit awards for academic performance + extracurricular involvement; parish/community scholarships; multi-student assistance)

Need-Based Financial Aid

  • St. Catherine'sYes (FACTS (Archdiocese form auto-applies to SCM's own program); opens Dec, due Mar. TEFA participant, but may reduce school aid when TEFA funds received.)
  • St. ThomasYes (~1/3 of students aided; $2.7M+/yr; awards 10-95% of tuition; Blackbaud; deadline Jan 15, 2027; awards mid-March)
  • DuchesneYes ($2M+ awarded annually to ~26% of students; Clarity portal)
  • O'ConnellYes (Guardian Angel Scholarship (needs-based, volunteer component) via FACTS Grant & Aid; TEFA state accounts accepted)

Sibling Discount

  • St. Catherine's10% off for each younger sibling
  • St. Thomas$2,000/yr per sibling after the first
  • DuchesneNot Published
  • O'ConnellMulti-student assistance available (amount not published)

Aid Award Notification

  • St. Catherine'sNot Published
  • St. ThomasNot Published
  • Duchesne2027-03-05 (Award acceptance Mar 24, 2027.)
  • O'ConnellNot Published

Included in Tuition

  • St. Catherine'sNot Published
  • St. ThomasLaptop & technology
  • DuchesneNot Published
  • O'ConnellNot Published

Payment Plans

  • St. Catherine'sNot Published
  • St. ThomasNot Published
  • DuchesneFull (May 20) · 2-pay (May / Nov) · 12-month monthly
  • O'ConnellNot Published
Commute from home
Tuition
$20,560

2026-27 rate · 9th grade; grades 10-12: $20,753

$27,900

2026-27 rate

$33,600

2026-27 rate · Upper School

$9,100

2025-26 rate (newest published)

What's included
Fees listed separately see fees
  • Application fee: $150
  • Tuition deposit: $750
  • New Student Fee: $850
  • Facility fee: $800
  • Program fee: $2,500–$2,750
Included in tuition see list
  • Laptop & technology

Charged separately:

  • Application fee: $75
  • Registration fee: $700
  • Camp Aquinas (freshman retreat): $650 (freshmen)
  • Class retreat: $325 (returning/transfer students)
  • Books: $550
  • Athletics fee: $250 (per sport) — optional
  • AP exam: $99 (per course) — optional
Fees listed separately see fees
  • New Student Fee: $1,500
  • Enrollment deposit: $1,000
  • Technology fee (Grade 9): $2,600
  • Textbooks: $350 (approximate, Upper School)
  • Grade 10 College Tour: $500 (grade 10)
  • Graduation fee: $600 (seniors)
  • Class trips: $175–$2,800 — optional
  • AP exams: $100–$200 (per exam) — optional
  • Athletics fee: $150–$300 (per sport) — optional
Fees listed separately see fees
  • Registration fee: $450
  • Technology fee: $200
  • Sports fee: $150–$250 (per sport ($450 all-season package)) — optional
Sibling discount10% off for each younger sibling$2,000/yr per sibling after the firstNot PublishedMulti-student assistance available (amount not published)
Lower school on campus
Yes

14 months–12th (Montessori)

HS only
Yes

PK3–12

HS only
Open houseNot postedDec 6, 2026Nov 1, 2026Not posted
Required test
None
ISEE

Offered on campus: Nov 14, 2026 · Jan 9, 2027

ISEE
In-house placement test
Application deadlineJan 15, 2027Jan 15, 2027Not postedNot posted
Decision dateMar 5, 2027Mar 5, 2027Not postedNot posted
Financial aid
Need-based
Need-based + Merit
Need-based + Merit
Need-based + Merit
AP coursesNot posted2120Not posted
Enrollment2379130080
Student:Teacher14.4:19:18.1:14.5:1
Mass
Monthly
Monthly
Not Published
Monthly
Sports6 sports12 sports12 sports13 sports
Links

“Not posted” means the school hasn’t published it yet for this admissions cycle — check each school’s full profile for sources.