| NIS | SISB Chiang Mai | |
|---|---|---|
| Headline tuition (Grade 6-8 / Grade 7) | 435,600 THB · £9,701 | 502,800 THB · £11,197 |
| Non-refundable one-off fees | 71,000 THB | 160,000 THB |
| Refundable deposits | 30,000 THB | 30,000 THB |
| Compulsory annual extras | 0 THB | 416,400 THB |
| First-year outlay | 506,600 THB · £11,282 | 1,079,200 THB · £24,034 |
| Area | San Phi Suea | Chiang Mai |
| Curriculum | American-style curriculum, K1 to Grade 12 (ACS WASC accredited) | Child-centred early years (Nursery-Kindergarten), Singapore curriculum (Primary), UK curriculum (Grades 7-12) |
| Fee year, checked | 2025-26, 2026-10-31 | 2026-27, 2026-11-02 |
Pound figures use 44.9 THB per GBP (Latest daily mid-market snapshot · 10 November 2026). The two schools may band their years differently; the headline row is Year 7 or the band the school publishes that contains it.
Full tables
The complete year-group tables, one-off fees, extras and source links are on each school's page: Nakornpayap International School fees and Singapore International School of Bangkok, Chiang Mai Campus fees. Every Chiang Mai school, cheapest first: international school fees in Chiang Mai.
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. Alternative or special-case one-off fees (per-family rates, boarding deposits, waiting-list fees) are listed on the school pages but not added into totals. Corrections: editorial@thebaht.com.