The International Baccalaureate (IB) Diploma requires six subjects studied across two years, plus an extended essay, theory of knowledge and creativity-activity-service, giving breadth. A-levels typically mean three or four subjects studied in depth with no compulsory extras. Neither is objectively "better" — the right choice depends on whether a student thrives with breadth or wants to specialise early.
What is the IB Diploma?
The International Baccalaureate Diploma Programme (IBDP) is a two-year post-16 qualification, sat by students roughly aged 16–19, offered by a growing number of UK sixth forms and international schools alongside A-levels. Students choose six subjects — one each from Studies in Language and Literature, Language Acquisition, Individuals and Societies, Sciences, Mathematics, and the Arts (or a second subject from another group instead of the Arts).
Three subjects are studied at Higher Level (HL) and three at Standard Level (SL), with HL demanding roughly 240 teaching hours against SL's 150. On top of the six subjects, every IB student completes:
- Theory of Knowledge (TOK) — a course examining how we know what we know, assessed by essay and presentation
- Extended Essay (EE) — an independent 4,000-word research essay on a topic of the student's choosing
- Creativity, Activity, Service (CAS) — a non-assessed but compulsory programme of extracurricular activity over the two years
What are A-levels?
A-levels (Advanced Levels) are the traditional post-16 qualification in England, Wales and Northern Ireland, typically studied over Year 12 and Year 13. Most students choose three, sometimes four, subjects and drop all others entirely, allowing deep specialisation — for example a student aiming at medicine might take Biology, Chemistry and Maths with nothing else.
A-levels are set by exam boards including AQA, OCR, Pearson Edexcel and WJEC/Eduqas, are graded A*–E, and (outside a minority of schools running the Extended Project Qualification, EPQ) carry no compulsory essay, reflection or service component. Since 2017 (2019 in Wales), most A-levels have been "linear" — assessed by exams at the end of Year 13 rather than modular exams along the way.
IB Diploma vs A-levels: the key differences
| Feature | IB Diploma | A-levels |
|---|---|---|
| Number of subjects | 6, across all major disciplines | Typically 3–4, self-selected |
| Structure | Breadth-based, compulsory core (TOK, EE, CAS) | Depth-based, no compulsory core |
| Grading | Points out of 45 (7 per subject + up to 3 core points) | A*–E per subject |
| Assessment style | Coursework, orals, essays and exams | Predominantly final exams (mostly linear) |
| Maths requirement | Compulsory for all students | Optional — can be dropped after GCSE |
| Essay writing | Extended Essay compulsory (4,000 words) | Only via optional EPQ |
| Availability in UK schools | Fewer schools, mostly independent/sixth-form colleges | Nearly all sixth forms and colleges |
| University recognition | Widely recognised, UCAS tariff points assigned | Universal UK standard, UCAS tariff points assigned |
Is IB harder than A-levels?
This is one of the most common questions parents ask, and the honest answer is that the two are hard in different ways rather than one being straightforwardly harder. The IB's workload is heavier in volume — six subjects plus TOK, EE and CAS running simultaneously across two years, with no opportunity to drop weaker subjects after Year 12. A-levels concentrate effort into fewer subjects, so the depth of content within each one can be more demanding, particularly at A* level.
Universities and the Russell Group's Informed Choices guidance broadly treat a strong IB score (typically 38–45 points) as equivalent to three A*/A grades at A-level for competitive courses. Neither qualification carries an automatic difficulty premium in admissions — offers are made against UCAS tariff points and specific subject requirements, not the qualification's reputation alone.
Which subjects does each route require or allow?
IB Diploma requires breadth by design — every student studies a language, a science, a humanity, maths and the arts (or a substitute), meaning a student cannot avoid a whole discipline for two years. This suits students who are strong all-rounders or undecided about their university direction.
A-levels allow early narrowing. A student certain they want to study Engineering can take Maths, Further Maths and Physics and drop English, languages and humanities entirely from Year 12 onward. This suits students with a clear subject passion or a course (like Medicine or Law) with specific A-level requirements.
How does grading and UCAS scoring compare?
- IB: each of the six subjects is graded 1–7, plus up to 3 additional points from TOK and EE combined, for a maximum of 45 points. Most UK universities set offers around 32–38 points; the most competitive courses ask for 38–40+.
- A-level: each subject graded A*–E. Universities typically ask for grades such as AAB or A*AA, translated by UCAS into tariff points (an A* is worth 56 points, an A 48, and so on).
Both systems map onto the UCAS tariff, so universities can compare applicants fairly across the two qualifications — see GOV.UK's guide to qualification levels for how these sit alongside other post-16 routes like BTECs.
Which route suits which student?
- Choose IB if: your child enjoys a broad curriculum, writes well, manages multiple deadlines comfortably, and wants to keep options (including overseas universities) open longer.
- Choose A-levels if: your child has a clear subject strength or career direction, prefers depth over breadth, or would find six simultaneous subjects plus TOK/EE/CAS overwhelming.
- Consider school availability first: far fewer UK schools offer the IB than A-levels, so for many families the practical choice is which local sixth forms offer which qualification, not an abstract preference.
Frequently asked questions
Is IB recognised by UK universities?
Yes. All UK universities, including every Russell Group institution, recognise the IB Diploma and set entry requirements in IB points alongside A-level grade equivalents. UCAS assigns tariff points to IB results in the same way it does for A-levels, so applications are compared on a like-for-like basis.
Can you switch from IB to A-levels partway through sixth form?
It is difficult but not impossible. Because IB students study six subjects with a compulsory core from the start of Year 12, switching mid-way usually means changing schools and repeating content, since most sixth forms won't have parallel A-level teaching for a mid-IB transfer. Any switch is easiest before or right at the start of Year 12, not partway through.
Do IB students need to take Maths?
Yes, Maths is compulsory in the IB Diploma, unlike A-levels where it can be dropped after GCSE. Since 2019, IB offers two Maths routes — Analysis and Approaches (more traditional, algebra-heavy) and Applications and Interpretation (more statistics and real-world modelling) — so students can choose the style that suits them, but not opt out entirely.
Does the IB take up more time than A-levels?
Generally yes, in terms of scheduled workload. Six subjects plus TOK, the Extended Essay and CAS activities typically mean more contact hours and more concurrent deadlines than three or four A-level subjects. Families should weigh this against each individual student's capacity to manage multiple pieces of coursework at once.
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