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Trinity International School

Thailand, Bangkok

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· Reviewed by · B2C Marketing Manager

Independently researched by doris.
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The school at a glance
Instructs in English
Fees THB 154,250 - 220,870
Ages 3 - 18 years
Pupil numbers 450
Type Co-educational
Opened 2003
Bus Service Yes
Availability Not shared by this school
Academic offering
Curriculum Advanced Placement (AP), American Curriculum
Taught languages English, Thai
Typical class size 25
Strengths Sport, STEM, Academic Enrichment
Clubs Arts and Creative, Cultural and Language, Community and Service
Stages Kindergarten, Elementary, Middle School, High School
Introduction

Trinity International School (TRIS), established in 2003 and located at 30 Sukhumvit Soi 36 in Bangkok’s residential Sukhumvit district, serves around 450 students aged 3 to 18. The school follows an American Curriculum based on California's Common Core, with the option to pursue Advanced Placement (AP) courses in upper grades. English is the language of instruction, and the school also teaches Thai and Mandarin. TRIS operates a school bus service, enhancing access from nearby neighbourhoods. The school is licensed by the Thai Ministry of Education and accredited by WASC and ONESQA. Notable strengths include emphasis on STEM (including a UC Berkeley partnership), academic enrichment through AP offerings, and a strong orientation toward service, rooted in values education.

trinity.ac.th

30 Sukhumvit Soi 36 Lane 2, Bangkok 10110, Thailand

Vibes and Culture
The school has not added this information
The Essentials

Trinity International School has 450 pupils, typical class sizes of 25, instruction in English.

Location
Trinity International School is located at 30 Sukhumvit Soi 36, Khlong Tan, Khlong Toei, Bangkok 10110. It sits in the Sukhumvit area, a well-connected part of the city, with Thonglor BTS station at the entrance to Soi 36, making it accessible for families using public transport. The neighbourhood is a mix of residential streets and commercial amenities, offering convenience for commuting parents.

Stages
The school offers education from Kindergarten (ages 3+) through Grade 12. This covers early years, elementary, middle school, and high school levels, with age-appropriate curricula for each stage.

Type
TRIS is a co-educational day school. It does not provide boarding facilities.

Additional learning support
The school provides Learning Support for students who require extra help, with teachers and support staff working with parents to meet individual needs. Students with limited English proficiency can join the ESL program until they are ready to join mainstream classes.

Country affiliation
TRIS follows the American (California) curriculum and is accredited by the Western Association of Schools and Colleges (WASC), a U.S.-based body.

Religious affiliation
The school is affiliated with the Seventh-day Adventist Church and incorporates values education based on Adventist principles.

School day structure
The school day runs from 07:30 to 15:00, with student arrival between 06:45 and 07:25. Students begin the day in homeroom with the national anthem, attendance, and announcements, and have scheduled breaks and a lunch period during the day.

Bus service
TRIS operates its own van service for transporting students to and from school.
Diving Deeper
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Fees

Annual tuition at Trinity International School ranges from THB 154,250 to THB 220,870 for 2026/27.

Application & Placement Test Fee: THB 4,000 (one-time, non-refundable)

One-Time Entry Fees
Enrollment Fee:
K1–K3: THB 80,000
G1–G12: THB 110,000

Development Deposit: Waived until July 31, 2026.

Registration Fee: THB 15,000 for all grades.

Books & Damage Deposit: THB 22,000 (G6–G12 only; refundable if materials are returned in good condition).

Annual Tuition Fees
K1–K3: THB 198,000
G1–5: THB 203,900
G6–8: THB 220,870
G9–12: THB 220,870

Annual Recurring Fees
General Fee: THB 36,045 – THB 39,040 depending on grade

Lunch & Morning Snack: THB 15,550 (K1–K3) to THB 24,400 (G9–12)

Parent/Teacher Association Fee: THB 500

Other Fees
EAL Fee: THB 30,000 per semester (if applicable)

Re-registration Fee: THB 15,000 annually

Uniforms: THB 1,200 – THB 1,700 per set; Pathfinder and PE uniforms also required

PSAT (G10 & G11): THB 1,200

AP Courses (HS): THB 15,000 per subject

School Bus: THB 25,000 – THB 40,000 per semester

Payment Methods
Payments are accepted via bank transfer; confirmation required from the finance office.

Refund Policy
Refunds are provided only for refundable deposits under stated conditions.
Academics

Trinity International School teaches Advanced Placement (AP), American Curriculum for students aged 3 to 18.

Curriculum
Trinity follows an American curriculum based on the California Department of Education’s K‑12 standards, with content adapted to support Math and Science through a partnership with UC Berkeley’s GEMS program. From Kindergarten through Grade 12, students follow this American-based program, integrating values education rooted in Seventh‑day Adventist principles. Early grades (K–5) focus on foundational literacy, numeracy, and values such as honesty and respect, while middle and high school include Advanced Placement (AP)‑level coursework in subjects like Calculus, Physics, Chemistry, and more. The curriculum also includes an English as a Second Language (ESL) program to support students not yet fluent in English, including summer school, until they can move into mainstream classrooms. Overall, TRIS provides a structured academic progression from early years to Grade 12 that combines U.S. academic standards with holistic character development and technical enrichment.

Academic calendar
Wellbeing
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Parent Experience
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Facilities
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Extra-Curricular Activities
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Languages
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Reputation
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Admissions

Admissions
1. Submit Application and Fee
Parents complete the TRIS Application for Admission and pay a non-refundable application fee. The application must be accompanied by required documents, including a recent medical report, immunisation record, and the student’s most recent school report.

2. Take Placement Test
Applicants aged six or older take a placement test. Students with low scores in English are required to join the ESL program.

3. Confirm Acceptance and Pay Fees
Once accepted, families must pay one-time entry fees and annual fees. Additional costs may apply for ESL, graduation, and parent council membership.

4. Collect Registration Package
Families receive a package with key information, school calendar, timetable, request forms (e.g., transport, lockers, online access), and the Student/Parent Handbook. This package also includes teacher contact details and school layout maps.

Scholarships
The school does not publicly disclose information about scholarships or financial aid in the provided admissions materials.

Waitlist
The school operates an open admissions policy, meaning students can enrol at any time during the school year if places are available. There is no publicly stated waitlist or pool system.
School Events
The school has not added events
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