Choosing an International Baccalaureate (IB) school involves more than finding the highest name in a league table. Academic results matter, but families should also consider subject availability, school culture, fees, location, admissions requirements and the support available throughout the Diploma Programme (DP).
To help families begin their research, we have ranked the top IB schools in the UK based on their students' average IB Diploma score in 2026. We also examine what the results mean and what families should consider before choosing a school.
Key Takeaways
- King's College School, Wimbledon has the highest average IB score in the UK in 2026: 42.5 points out of 45.
- The top 10 UK schools averaged 39.8 points, about nine points above the worldwide average of 30.8.
- Four schools averaged more than 40 points. Only 4.3 points separate first and tenth place.
- Sevenoaks School averaged 39.6 points across 252 students, by far the largest cohort in the top 10.
- Annual day fees at these schools range from about £23,000 to £48,000, including VAT.
How We Defined the Top IB Schools
For this ranking, "top" means the schools with the highest average IB Diploma score in 2026.
The IB Diploma is scored out of 45 points. Students generally need at least 24 points, together with meeting the programme's other requirements, to receive the Diploma. The worldwide average for the May 2026 exam session was 30.8 points.
Average results provide a useful indication of a school's overall academic performance, but they are not a complete measure of school quality. Admissions selectivity, cohort size, subject availability and the level of student support can all influence a school's average.
Methodology: The ranking uses the 2026 results published by IB-Schools.com, an independent guide that is not connected to the IB. Schools are ordered by average IB Diploma score. The source places schools with fewer than 20 students in a separate small-cohort table, so they are not included here. Results were checked on 21 October 2026, after re-marks.
Top 10 IB Schools in the UK by Average Score
| Rank | School | Average IB score | Day or boarding | Day fees | Boarding fees | IB cohort |
|---|---|---|---|---|---|---|
| 1 | King's College School, Wimbledon | 42.5 | Day | £35,820 | — | 46 |
| 2 | Godolphin and Latymer School | 41.3 | Day | £36,380 | — | 28 |
| 3 | Cheltenham Ladies' College | 40.6 | Day and boarding | £43,380 | £68,220 | 35 |
| 4 | Whitgift School | 40.3 | Day and boarding | £31,410 | £61,614 | 41 |
| 5 | Sevenoaks School | 39.6 | Day and boarding | £43,383 | £67,149 | 252 |
| 6 | Ardingly College | 39.5 | Day and boarding | £36,270 | £57,870 | 36 |
| 7 | Wellington College | 39.1 | Day and boarding | £47,790 | £65,070 | 79 |
| 8 | Bromsgrove School | 38.5 | Day and boarding | £25,398 | £56,790 | 37 |
| 9 | King Edward's School, Birmingham | 38.3 | Day | £23,085 | — | 90 |
| 10 | Fettes College | 38.2 | Day and boarding | £47,700 | £56,550 | 50 |
Results and cohort data: IB-Schools.com's UK league table. Fees were cross-checked against the schools' official 2026/27 fee pages on 26 August 2026. Annual figures are three times the published termly fees and include VAT.
What the 2026 Results Tell Us
The average score across the top 10 schools is 39.8 points, about nine points above the May 2026 worldwide average of 30.8.
King's College School, Wimbledon leads the table with 42.5 points, only 2.5 points below the highest possible Diploma score. The top four schools all achieved averages above 40, while only 4.3 points separate first and tenth place.
The table also shows that high IB performance isn't limited to one type of school or location. London schools hold several leading positions, but schools elsewhere in England and in Scotland also appear in the top 10. Most of the listed schools offer both day and boarding places, so the ranking is relevant to local and internationally mobile families.
Cohort size deserves particular attention. Sevenoaks achieved an average of 39.6 across 252 students, by far the largest cohort in the top 10. King Edward's School, Birmingham also combined a strong 38.3 average with a comparatively large cohort of 90. An excellent result across a large cohort is a different kind of evidence from an equally high average among 20 to 30 students.
League tables should therefore be used as a starting point, not a final verdict. They don't show the range of student scores, progress from entry, subject-level results or how well a school supports students who are struggling.
How do UK schools compare internationally? Six UK schools are in the global top 15 this year. See our analysis of the top IB schools in the world in 2026.
A Closer Look at the Top Five
1. King's College School, Wimbledon
King's College School recorded the UK's highest average in 2026 at 42.5 points. Its cohort of 46 is large enough to make the result particularly notable. It is a day school in south-west London and is co-educational in the sixth form, while younger year groups are boys only.
2. Godolphin and Latymer School
Godolphin and Latymer achieved an average of 41.3 across 28 Diploma students. It is a girls' day school in west London and one of only four UK schools in the table to average more than 40 points.
3. Cheltenham Ladies' College
Cheltenham Ladies' College achieved a 40.6 average with a cohort of 35. Its day and boarding options may make it relevant to families looking for a residential girls' school outside London.
4. Whitgift School
Whitgift recorded an average of 40.3 from 41 students. It is a boys' school in Croydon offering both day and boarding places, and it has the lowest published day fee among the four schools averaging above 40.
5. Sevenoaks School
Sevenoaks achieved an average of 39.6 across 252 students. Although it ranks fifth by average score, its much larger cohort is important context. It is also the highest-ranked fully co-educational school in the table.
These profiles are an overview, not a substitute for visiting schools, reviewing current admissions information and confirming subject choices directly.
The IB and the UK Curriculum
In the UK, the IB Diploma is generally offered as an alternative to A-levels for students aged 16 to 19. A-level students commonly specialise in three or four subjects, whereas full IB Diploma students study six subjects and complete three core components:
- Theory of Knowledge (TOK)
- The Extended Essay (EE)
- Creativity, Activity, Service (CAS)
The IB therefore keeps more academic breadth. Students continue studying languages, mathematics, sciences and humanities rather than narrowing their subjects as much as they would with A-levels.
UK universities recognise the IB Diploma, but entry requirements vary. Universities may ask for a total Diploma score as well as particular grades in Higher Level (HL) subjects. Students considering degrees such as medicine, engineering, economics or mathematics should check university requirements before finalising their IB subjects.
Why Is the IB Popular in the UK?
The IB appeals to UK families for several reasons.
First, its international recognition suits globally mobile families and students who may apply to universities in more than one country. Second, the programme's breadth lets students continue several areas of study while developing research, writing and critical-thinking skills. Finally, the Extended Essay and Theory of Knowledge can be useful preparation for independent, university-level work.
The programme can be especially attractive to capable all-rounders who don't want to specialise early. However, students who strongly prefer a smaller number of subjects may find A-levels a better fit. The choice between the two should be based on the student's learning style and future plans, not on the assumption that one qualification is better for everyone. Read more in our guide to whether the IB is worth it.
How Much Does an IB School Cost in the UK?
The schools at the top of this ranking are mostly independent schools. Among the top 10, the published figures show:
- Annual day fees from about £23,085 to £47,790
- Annual boarding fees from about £56,550 to £68,220
- An average published day fee of about £37,062 per year
These figures are a starting point rather than a complete family budget. Other costs may include:
- Application and registration fees
- Deposits
- Exam fees
- Uniforms and equipment
- Transport and school trips
- Music, sports or specialist lessons
- Boarding-related costs
- Additional learning support
Since 1 January 2025, education and boarding services supplied for a charge by UK private schools have been subject to VAT at the standard rate of 20%. Families comparing current fees with older figures should make sure they're using up-to-date prices that include VAT.
Scholarships and means-tested bursaries may be available, but their value and eligibility rules vary. Families should ask whether financial help applies to both years of the Diploma and whether awards cover costs beyond tuition.
The table uses the fee most relevant to a new sixth-form student where a school publishes different rates by year group or entry point. Families should still request an individual fee schedule from each school, as deposits, compulsory charges and optional extras aren't included in the comparison.
How to Choose the Right IB School in the UK
1. Look beyond the average score
Ask about Diploma completion rates, the range of scores achieved, student progress, subject-level results and support for students who fall behind. Averages alone don't show whether a school helps a wide range of students improve.
2. Check the available subject combinations
Not every school offers every IB subject, and timetable restrictions can make some combinations impossible. Confirm that the student's required subjects are offered at HL and can be taken together. Our IB subject guides explain what each course involves.
3. Compare the IB with other pathways
Some schools offer both the IB and A-levels, while others focus mainly on the IB. Ask whether both pathways receive the same staffing, resources, university guidance and extracurricular support.
4. Evaluate academic and wellbeing support
The IB involves six subjects, internal assessments, final exams, the Extended Essay, Theory of Knowledge and CAS. Families should ask about academic mentoring, pastoral care, counselling, class sizes, learning support and how the school helps students manage competing deadlines.
5. Calculate the full financial commitment
Compare the likely cost across both Diploma years rather than focusing only on annual tuition. Include fee increases, travel, boarding costs and optional activities.
6. Consider location and lifestyle
A London day school may offer easy access to cultural institutions but could involve a long commute and higher living costs. A boarding school outside London may offer a close residential community and easier access to on-campus activities. The right choice depends on the student's independence and preferred environment.
7. Visit and ask specific questions
Where possible, attend an open day and speak with the IB coordinator, current students and subject teachers. Ask how deadlines are scheduled, how often students meet supervisors and what happens when someone begins to struggle.
Other Important Considerations
Families should also look at:
- University guidance: Does the school have experience supporting UK and international applications?
- Class sizes: How much individual attention can students expect?
- Boarding provision: What academic and pastoral support is available outside lesson time?
- Learning support: How does the school help students with additional learning needs?
- Facilities: Are laboratories, libraries, arts spaces and study areas suitable for the subjects offered?
- School culture: Is the atmosphere collaborative, highly competitive or a mix of both?
- Student voice: What do current students say about workload, feedback and wellbeing?
The ideal school should match the student's academic goals, personality and preferred way of learning, not simply hold the highest ranking.
How Does IB Tutoring Fit In?
Even students at high-performing schools can benefit from targeted tutoring. The IB moves quickly, and gaps in one topic become harder to fix once internal assessments, mock exams and final revision start to overlap.
An experienced online IB tutor can help students:
- Strengthen difficult topics
- Improve exam technique
- Organise revision across six subjects
- Understand the assessment criteria
- Prepare for mock and final exams
- Build confidence and sustainable study routines
- Get targeted feedback between school lessons
Tutoring should support the student's school programme rather than add unnecessary pressure. It should also follow the IB's academic integrity rules. For internal assessments and the Extended Essay, good tutoring focuses on subject understanding, planning and permitted feedback, never on writing assessed work for the student.
Families don't need to wait for grades to fall. Early, focused support can help students build strong foundations and manage the Diploma workload with confidence. We have IB tutors across the UK, including in London, Surrey, Oxford, Bath, Edinburgh and Manchester. Students can also explore our subject pages for IB Maths and IB English.
Final Thoughts
The UK's leading IB schools produced exceptional results in 2026. However, the school with the highest average won't automatically be the best choice for every student.
Use rankings to create a shortlist, then compare subject availability, admissions requirements, fees, academic support, extracurricular opportunities, location and school culture. A successful IB experience depends not only on where a school sits in a league table, but on how well the environment fits the individual student.
If your child would benefit from personalised help with an IB subject, exam preparation or managing the Diploma workload, organise an IB tutor matched to their goals and learning needs.
League table data checked on 21 October 2026. Fees reviewed on 26 August 2026.
