BASIS International School Bangkok (BASIS)
Key Stats
Annual Fees: US$16K – US$29K
Curriculum: International
Age Range: 3–18
Students: ~550
Location: Bangkok
Updated February 2026
In Brief
BASIS International School Bangkok is part of the global BASIS network serving over 17,000 students across 31 campuses, offering an accelerated American liberal arts and sciences curriculum culminating in Advanced Placement courses. Located in Bang Khun Thian with purpose-built facilities including STEM labs and athletics facilities, it focuses on preparing all students for top global universities through rigorous academics and critical thinking development.
Operating as the 35th school in the BASIS Curriculum Schools network, the Bangkok campus delivers an enhanced American educational model divided into Early Learning Program, Primary School, Middle School, and High School levels. Under Head of School Mark Sylte's leadership, the school emphasizes core subjects including mathematics, science, English, and history through interdisciplinary learning approaches. The curriculum builds toward Advanced Placement courses in high school, designed to increase university acceptance rates and scholarship opportunities for graduates.
The purpose-built campus on Soi Rama II features modern classrooms designed for both collaborative and individual study, STEM laboratories, music and art rooms, indoor and outdoor performance spaces, an air-conditioned gymnasium, swimming pools, and running track. These facilities support the school's focus on academics, arts, and athletics while accommodating the BASIS curriculum's emphasis on depth and breadth across liberal arts and sciences. The multicultural Bangkok environment enhances students' exposure to diverse communities, aligning with the school's global perspective and college preparation goals.
What parents value
- –Part of established BASIS network with consistent top global rankings
- –Accelerated curriculum providing college-level preparation for all students
- –Purpose-built modern facilities including STEM labs and athletics amenities
- –Advanced Placement program designed to improve university acceptance rates
- –Focus on critical thinking and student autonomy development
- –Multicultural Bangkok setting enhancing global exposure
Points of consideration
- –Relatively new to Bangkok's established international school market
- –American curriculum may not suit families seeking IB or British qualifications
- –Accelerated pace may not be appropriate for all learning styles
- –Limited public information about specific academic results or university placements
- –Location in Bang Khun Thian may be less convenient for some Bangkok families
Annual Fees
| Year Group | Age | USDTotal Annual Fee |
|---|---|---|
| Nursery | 3 | 17,004 |
| PreK 1-2 | 3 | 19,656 |
| Kinder | 4 | 20,280 |
| Grades 1-3 | 6 | 24,180 |
| Grades 4-5 | 9 | 24,414 |
| Grades 6-8 | 11 | 28,017 |
| Grades 9-12 | 14 | 31,137 |
Fees converted from THB. For the most up to date and accurate figures please double check with the school.
Additional Fees
| Fee | Amount |
|---|---|
| Application Fee | 156 |
| Registration Fee | 7,800 |
| Security Deposit | 3,120 |
| Campus Development Fee (annual) | 686 |
Photos

Academic Results
AP Results (2025): 93% passing rate, 4.3 average score, 84% of scores were 4 or higher, and 52% were a perfect 5. 33 students took 73 AP exams. University Destinations: 100% of students were accepted to one or more universities.
Extra Curriculars
Sports: Badminton, Football (Soccer), Rugby, Swimming, Taekwondo, Tennis, Gymnastics, Basketball. Arts & Clubs: National Junior Honors Society (NJHS), IAMS Project (Independent, Art, Music, Sport), Music Loft, Artist Loft, student-led clubs. Programs: Chinese Language Program (optional), Thai Language and Culture Program.
Campus: 22 rai (8.7 acres) situated next to a 35 rai (14 acres) park. Swimming: 25m competition pool, Kindergarten learning pool. Sports: 1,600+ sqm indoor air-conditioned sports complex (convertible gym), 12 rai of sports fields, 500m cross-country track, 178.5 sqm gymnastics room.
Inspections & Accreditations
Inspection
- ONESQA Accreditation for 2025-2029
- Not publicly listed.
Accreditations
- Cognia NCA CASI, SACS CASI
- no ratings published for CIS, WASC, NEASC, COBIS/BSO, ISQM
Memberships
- EARCOS, ISAT
- Not publicly listed.
Student Body
Total Enrolment: ~550 students. Nationalities: 13 nationalities. Class Size: Maximum 15 (Nursery), 20 (PreK-K), 25 (Grades 1-12).
Leadership
Dr. Willem Hendrik van der Sluis - Head of School
Dr. Willem Hendrik van der Sluis is a global educator with a Doctorate in Education from the University of Glasgow, a Master’s in Inclusive Education from Middlesex University London, and a Bachelor’s in Pedagogics from The Netherlands.
