Bangkok Patana vs NIST vs ISB: How They Compare

Comparison table

# Bangkok Patana vs NIST vs ISB: How They Compare

Bangkok · Comparison

Three names show up on almost every Bangkok shortlist for the top tier: Bangkok Patana School, NIST International School and International School Bangkok (ISB). Each is non-profit, each has multi-generational alumni, and each fills its waiting lists. The differences sit underneath: a British-into-IB pathway at Patana, a full IB continuum at NIST, an American-with-IB-and-AP blend at ISB, each on a campus that sets a different rhythm for family life.

This sets the three side by side on what families weigh past the brochure stage: curriculum, recent results, fees and what is bundled in, location and feel, and how each handles admissions when demand exceeds supply.

At a glance

Bangkok Patana (1957) is the city's oldest British international school. English National Curriculum to IGCSE, then IB Diploma at sixth form rather than A Level. Ages 2 to 18, fees roughly THB 515,000–1,014,000, 48-acre Bang Na campus (Sukhumvit 105), around 2,300 students from 68 nationalities.

NIST International School (1992) was Thailand's first full IB World School, governed as a parent-elected foundation. PYP, MYP, IBDP. Ages 3 to 18, fees roughly THB 628,200–1,094,500, compact 25-rai campus on Sukhumvit 15 near Asok BTS, around 1,800 students from 93 nationalities, 10:1 student–teacher ratio.

International School Bangkok (ISB) (1951) was Thailand's first international school and is non-profit. American curriculum, with IB Diploma and AP in high school. Ages 3 to 18, fees roughly THB 659,000–1,197,000, 37-acre Nichada Thani campus plus a 15-acre wilderness campus in Petchaburi, around 1,800 students from 60+ nationalities, 9.3:1 ratio.

Curriculum

The three represent the three dominant curriculum families in international education, and a family that has decided which family suits a child can almost short-list on that basis alone.

Patana is a British school that switches at the end of Year 11. Primary follows the English National Curriculum, IGCSEs sit through Years 10 and 11, and sixth form is IB Diploma only, with no A Level pathway. The argument is breadth: students keep maths, sciences, humanities and a language to 18 rather than narrowing to three or four A Levels. A child heading toward UK STEM admissions on three A Levels has to recalibrate.

NIST is a pure IB school from 3 to 18. PYP through primary, MYP through Years 7 to 11, IBDP through 12 and 13. The continuum is its identity. Families joining late from a national system can find MYP's interdisciplinary, inquiry-led structure a real adjustment.

ISB is the most American of the three. Day-to-day curriculum is US-style, with AP courses running alongside the IB Diploma in high school. That suits transferring families who want US and international options open; the cost is that ISB is not single-pathway like NIST, nor a British-feeder like Patana.

Results

The headline 2025 IB Diploma numbers separate the three:

• NIST: average 37 points, 100% pass rate, 28% at 40+ (worldwide 9%), 110 diplomas, two perfect 45s, 56% bilingual diploma.
• Patana: average 35 points, 99% pass rate, 21% at 40+. IGCSE 2025: *66% A–A**.
• ISB: Class of 2025, 95 IB Diplomas at average 34 (global 30.58), 34% bilingual diploma, 28.5% of eligible students took at least one AP exam.

A 2- to 3-point gap on the IB average sounds small and, at the individual level, often is: any of the three can take a hard-working student into a competitive university. NIST's full continuum produces a cohort doing IB-style assessment since primary, which shows in the 40+ tail. Patana sits between the two, with strong IGCSE outcomes underneath. ISB's diploma cohort self-selects differently, with many high schoolers sitting AP rather than the full diploma.

Top-end destinations look similar, with regular placements at Oxford, Cambridge, Imperial, UCL, LSE, the Ivy League, Stanford and Melbourne. Families targeting UK Russell Group find Patana the easiest fit; families targeting US selective admissions with AP transcripts find ISB familiar; NIST graduates spread across both, with a tilt toward IB-friendly destinations.

Fees and what they include

Bangkok's top tier sits in a tight band at the upper end, and these three are all in it.

• Patana: roughly THB 515,000 (Foundation Stage) to THB 1,014,000 (Year 13) in tuition.
• NIST: roughly THB 628,200 (Early Years) to THB 1,094,500 (DP).
• ISB: roughly THB 659,000 (Pre-Kindergarten) to THB 1,197,000 (Grade 12).

Patana sits a notch below at the entry end; ISB sits highest at the top end; NIST is the most expensive at the lower years. Headline tuition is not the full bill: application and assessment fees, a refundable foundation or capital contribution at entry, annual capital levies, plus lunch, transport, uniform, IB exam fees and overnight trips all sit outside tuition. Bus surprises new families most, particularly at ISB where Nichada pushes routes into the city and at Patana where Bang Na routes can run an hour each way at peak.

All three are non-profit, which is the structural reason fees track the cost of running the school rather than a parent-company margin. NIST goes further on governance: most foundation members must be current parents, giving the parent body a direct line into decisions on building, staffing and fees.

Community and feel

Location is the single biggest determinant of daily life across the three.

NIST is the urban option. A short walk from Asok BTS, surrounded by Sukhumvit's restaurants, offices and condos, on a compact campus that feels dense rather than sprawling. The 2025 building programme added Innovation, Pavilion and new Elementary Buildings, easing the squeeze. The community skews toward families in central Sukhumvit who want walking-distance schooling.

Patana is the established suburban British community. Bang Na sits south-east of central Bangkok; the 48-acre campus carries three pools, an indoor sports centre, a 600-seat theatre and 200-plus weekly activities, large enough that almost any interest is staffed. Identity is rooted in continuity of staff and alumni.

ISB is the campus-village option. Nichada Thani is a gated community north of the city; the 37-acre main campus plus a 15-acre wilderness campus in Petchaburi shape a different rhythm. Facilities include 5 gymnasiums, 12 tennis courts, a rock-climbing wall and Olympic and 25-metre pools, and Friday traffic from a central job is the recurring grumble.

Admissions

All three run rolling admissions with assessment built in, and a confirmed place requires both an available seat and a decent fit on the assessment.

Patana tests English literacy and mathematics, with a written task and interview for older children. Reception, Year 7 and Year 12 fill earliest; sibling priority and the waitpool both apply.

NIST uses age-appropriate assessment in English and mathematics, with MYP and DP cohorts also reviewed on prior school reports. The compact size relative to ISB and Patana means Year 7 and Year 12 are tight.

ISB combines academic records, teacher recommendations and assessment. The Nichada location means diplomatic and corporate transfer cycles dominate the rhythm, with August intake the biggest turnover. The transition support programme is one practical reason the corporate-transfer community gravitates there.

EAL provision is established through primary at ISB and Patana; NIST integrates English support through PYP and MYP. None of the three is a beginner-EAL school at sixth form.

How to read the comparison

A useful filter is to translate each headline difference into a question a family can answer for themselves.

If a child has been doing the English National Curriculum and the family is open to IB Diploma at 16, Patana is the most continuous pathway. If the family wants A Level rather than IB at sixth form, the conversation moves to other British schools in the city.

If the family wants a single, continuous IB philosophy from 3 to 18 and central Bangkok suits the daily routine, NIST is the structural fit. If the family wants a large suburban campus, NIST is the wrong shape regardless of curriculum match.

If the family is American-educated, preparing for US admissions with AP transcripts, or on a corporate or diplomatic posting that values the gated-community rhythm, ISB is the closest match. If the family lives in central Sukhumvit and cannot stomach the Nichada commute, ISB is the wrong location.

What does not show up on a comparison table is how each school handles a child who does not fit the average. A school visit with specific questions about that specific child is what closes the gap.

FAQs

Which has the best IB results?

In 2025, NIST sits highest at a 37-point average and 100% pass rate, Patana at 35 points with 99%, ISB at 34 points. The gap is meaningful in aggregate, less so at the individual level, and the cohort mix differs across the three.

Which is the cheapest?

Patana starts lowest at the early years and ISB sits highest at the senior years; NIST is the most expensive at the lower years. Across all three, capital contributions, transport, lunch and exam fees add materially to the headline.

Which is best for British families?

Patana is the structural fit: English National Curriculum, IGCSE, then IB Diploma. British families enrol happily at NIST and ISB too; the curriculum continuity argument runs in Patana's favour.

Which is best for American families?

ISB is the structural fit: American curriculum with AP and IB at high school. Nichada is also where the largest American expatriate community in Bangkok lives, which reinforces the community match.

How early should we apply?

Twelve months ahead is the working target for an August intake into a popular year group at any of the three, and 18 months is safer for Year 7 and Year 12.