International school fees · Bangkok · 2026-27
Trinity International School fees 2026-27: 203,900 THB a year (£4,541)
Sukhumvit, Bangkok · ages 3 to 18 · American (California) curriculum; Seventh-day Adventist Christian education; WASC accredited · checked 30 October 2026
- Tuition, Grades 6-8203,900 THB
- Application & placement test fee, paid once4,000 THB
- Enrollment fee (K1-K3), paid once80,000 THB
- Enrollment fee (Grades 1-12), paid once110,000 THB
- Registration fee, paid once15,000 THB
- General fees (accident insurance, textbook rental, NWEA-MAP test, student ID, yearbook etc.), compulsory, each year– not published
- Lunch & morning snack, compulsory, each year– not published
- Parent/Teacher Association fee, compulsory, each year500 THB
- Re-registration fee, compulsory, each year15,000 THB
- First year, published parts only428,400 THB
- Plus books & damage deposit, refundable22,000 THB £490
- Plus development deposit, refundable– not published
The school lists General fees (accident insurance, textbook rental, NWEA-MAP test, student ID, yearbook etc.) and Lunch & morning snack as payable but gives no amount, so the total above leaves them out and the real first year is higher.
At the 12-month low of 41.876 this first year was £10,230. At the high of 45.194 it was £9,479.
Source: trinity.ac.th (image), the school’s own fee schedule. Checked 30 October 2026. Refundable deposits are shown separately and are not in the total. Optional extras, trips, transport and uniform are not in it either.
What a year costs here.
Trinity International School charges 203,900 THB a year for Grades 6-8 in 2026-27: about £4,541 at 44.9 baht to the pound. Non-refundable one-off fees add 209,000 THB, plus 22,000 THB of refundable deposits, so the first year at this year group costs about 428,400 THB (£9,540). Figures are from the school's own fee schedule, checked 30 October 2026.
Trinity International School is an international school in Sukhumvit, Bangkok, following the American (California) curriculum; Seventh-day Adventist Christian education; WASC accredited, taking children aged 3 to 18, founded in 2003, run by Seventh-day Adventist (Thailand Adventist Mission). The figures on this page are the school's own published fees for 2026-27, converted to pounds at the mid-market rate on the day The Baht last rebuilt this page. Nothing here is an estimate: where the school does not publish a number, the line is left blank.
Rate used at build: 44.9 THB per GBP, Latest daily mid-market snapshot · 10 November 2026.
Tuition by year group.
Tap a row for the source and the sum.
Every row above is from the school's own fee schedule at trinity.ac.th (image), read on 30 October 2026. Nothing is estimated or taken from a third-party site.
One-off fees and deposits.
- Development deposit–Amount not stated · Refundable deposit, not in the total · Normally 80,000 (K1-K3) or 110,000 (Grades 1-12), refundable when the student completes studies; waived until 31 July 2027–
Same source and date as the tuition table: trinity.ac.th, checked 30 October 2026.
Recurring extras the school lists.
- General fees (accident insurance, textbook rental, NWEA-MAP test, student ID, yearbook etc.)–Amount not stated · Compulsory, in the first-year total · Annual by band: K1-K3 40,100; Grades 1-5 70,240; Grades 6-8 72,090; Grades 9-12 78,080–
- Lunch & morning snack–Amount not stated · Compulsory, in the first-year total · Annual by band: K1-K3 15,550; Grades 1-5 21,170; Grades 6-8 22,690; Grades 9-12 24,400; morning snack served only to Kindergarten to Grade 4–
Source: trinity.ac.th, checked 30 October 2026. Amounts are per year as the school states them.
What the fee schedule says.
- Payment. Tuition due in July (1st semester) and December (2nd semester)
- School's published annual totals for all students (tuition + general fees + lunch + PTA): K1-K3 210,400; Grades 1-5 292,160; Grades 6-8 299,180; Grades 9-12 323,850 (excludes one-off fees, re-registration and EAL). Required uniforms 1,200-2,000 per set; PSAT (Grades 10-11) 1,200. Optional: locker 1,500/yr, AP course 15,000 per subject, school bus 25,000-40,000 per semester. Fees subject to change without notice.
What it costs in pounds, and why that moves.
The school bills in baht. A British family paying from sterling income pays a different amount every term because GBP/THB moves. The same Grades 6-8 fee of 203,900 THB is:
| GBP/THB | Annual fee in pounds |
|---|---|
| 48 | £4,248 |
| 44.9 (today) | £4,541 |
| 42 | £4,855 |
Between a strong-pound year and a weak one the sterling cost of this school moves by about £607 a year per child. A family paying termly from a UK account at a high-street bank's 3 to 5 per cent spread adds £182 a year on top. Fee payments are the single largest transfer most expat families make, which is why the transfer method matters more here than anywhere else in the budget.
A termly 67,967 THB transfer at the mid-market rate costs a fraction of a bank's spread. Compare the GBP to THB quote before the first invoice.
Schools in Bangkok at a similar fee.
Source: each school’s own fee page; open a school for its source and checked date.
All Bangkok schools, cheapest first, with the median and range: international school fees in Bangkok. The national picture is on Thailand international school fees 2026-27: the statistics.
Report a figure, read the method.
What did you actually pay at Trinity International School?
Published figures are the starting point; the real bill is what readers tell us. Reports are checked by hand before anything appears here, and no name or email is published.
Reading the fee schedule
- The hidden fees catalogue: the £30,000 to £70,000 your school will charge that is not in the tuition schedule.
- The fee inflation trap: how £18,000 in Year 1 becomes £32,000 by Year 13.
- The British family's decision framework for international schools in Asia.
- Where the £25,000 actually goes: the international school operating budget nobody publishes.
How The Baht records school fees
Every figure comes from the school's own website or fee document, recorded with its URL and the date it was checked. Figures are annual tuition as the school states them, in Thai baht, for the academic year shown. Where a school prints termly fees only, the annual figure is the termly fee multiplied by the number of terms and is marked as such. Refundable deposits are listed but excluded from first-year totals. Pound figures use the mid-market GBP/THB rate on the day the page was built (Latest daily mid-market snapshot · 10 November 2026) and are rounded to the nearest pound. Fee schedules change every year, usually between March and July; the checked date on this page is the date the figures were last read from the school's site. Corrections: editorial@thebaht.com.