The American School in Japan vs K. International School Tokyo
🇯🇵 Tokyo · Side-by-side comparison on verifiable public data.
Neither The American School in Japan nor K. International School Tokyo sits in a market with a public inspectorate, so both are assessed on verifiable accreditation, curriculum authorisation, and published data rather than an official quality rating. Curriculum is the core differentiator: The American School in Japan offers American while K. International School Tokyo offers IB, British — the choice should follow the family's target qualification system. Both are day schools with fees in the same market band — see the table below for the figures, and verify against each school's own published fees.
Key Facts
| The American School in Japan | K. International School Tokyo | |
|---|---|---|
| Curriculum | American | IB / British |
| Ages | 3–18 | 3–18 |
| Languages of instruction | English | English |
| Annual fees | JPY 2,987,000–3,533,000 | JPY 2,850,000–3,020,000 |
| Enrollment | 1,734 | 660 |
| Boarding | Day only | Day only |
| Accreditations | WASC | CIS, Edexcel |
Strengths
- ✓Long-established institution (founded 1902), among the oldest international schools in Asia
- ✓WASC-accredited with a clearly American, AP-based college-preparatory curriculum
- ✓Substantial scale: ~1,734 students and ~184 teachers across two purpose-run Tokyo campuses
- ✓Genuinely international community spanning 59 nationalities
- ✓Full continuous pathway from Nursery (age 3) through Grade 12
- ✓Outstanding, transparently published IB DP results (42.0/45 in 2025; five-year track record above 41)
- ✓Full CIS accreditation on a 5-year evaluation cycle — strong external quality assurance
- ✓Single-campus K1–G12 continuity (ages 3–18) — no transition between schools
- ✓Central, highly accessible Tokyo location (Shirakawa, Koto-ku); new 2024 main building
- ✓Established history (since 1997) with deep IB roots (IB World School since 2002)
Trade-offs
- !Does NOT publish AP results or university-placement data — outcomes cannot be independently verified
- !Explicitly offers no scholarships or financial aid for new applicants, with high all-in costs
- !English-fluency requirement for at least one parent narrows the applicant pool
- !Day school only — no boarding
- !Public detail on EAL/English-language support could not be confirmed
- !No EAL/language support for Grade 8 and above — students needing English help are explicitly not accepted
- !The IB continuum is incomplete in practice: MYP is no longer offered, and middle years run on Edexcel iLowerSecondary/IGCSE
- !High fees (~¥2.85M–3.02M annual tuition plus ¥700K capital and other one-time fees)
- !Third-party review sentiment is weak (small, unverified sample)
- !Enrollment/nationality figures differ between official site (~700/50+) and aggregators (660/45)
Best Fit For
- • Expatriate and internationally-mobile families in Tokyo seeking a U.S. college-prep track
- • Families targeting American/AP university admission pathways
- • Households wanting a single continuous K–12 (age 3–18) institution
- • Families who can absorb premium fees without needing financial aid
- • Families seeking a top-tier, results-driven IB Diploma outcome
- • Children entering in the early years (K1–early primary) who can grow up in the system
- • English-fluent international and bilingual families based in central/east Tokyo
University Placement
School-reported · not independently verified
Not public. No university-placement, college-matriculation, or AP results data is published on ASIJ's public website (consistent with the norm among Tokyo international schools).
School-reported: KIST publishes detailed IB DP results (42.0/45 average, 100% pass rate, 25% scoring 45 in 2025). A university-acceptance page exists but specific destination figures were not captured; treat placement claims as school-reported, unverified.
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Frequently Asked Questions
Should I choose The American School in Japan or K. International School Tokyo?
The American School in Japan is best for: Expatriate and internationally-mobile families in Tokyo seeking a U.S. college-prep track. K. International School Tokyo is best for: Families seeking a top-tier, results-driven IB Diploma outcome. The right choice depends on target curriculum, budget, and family priorities — the two are not linearly comparable.
How do fees compare between The American School in Japan and K. International School Tokyo?
The American School in Japan: JPY 2,987,000–3,533,000. K. International School Tokyo: JPY 2,850,000–3,020,000. Verify against each school's own published fees; some figures are sourced from third-party aggregators.
What curricula do The American School in Japan and K. International School Tokyo offer?
The American School in Japan: American. K. International School Tokyo: IB, British.
Do The American School in Japan or K. International School Tokyo offer boarding?
The American School in Japan: day school only. K. International School Tokyo: day school only.
This comparison is BrightKey's independent assessment using verifiable public data only. University-placement figures are school-reported and not independently verified. BrightKey takes no payments from schools. Our method →