IB vs A Levels: an expat parent guide

The two qualifications in plain English

The International Baccalaureate Diploma Programme is a two-year qualification taken in Years 12 and 13 (or the equivalent ages, 16 to 18). A diploma candidate studies six subjects across six prescribed groups, three at higher level and three at standard level, alongside three core requirements: Theory of Knowledge, the Extended Essay and a CAS portfolio of creativity, activity and service. Each subject is scored from 1 to 7. The maximum diploma score is 45, with up to 3 bonus points awarded for Theory of Knowledge and the Extended Essay combined. The world average in 2024 sat at roughly 30 points; the threshold for elite university interest typically begins around 38, and Oxbridge offers cluster around 40 to 42.

A Levels are the established upper-secondary qualification of the English educational system, taken across the same two-year stretch. Most pupils take three subjects, occasionally four, in genuine depth, and nothing else is compulsory. Each subject is graded A* to E based principally on final external exams sat at the end of Year 13. UK university offers are made in terms of three A Level grades, for example AAA or A*AB. The A* grade was introduced in 2010 to discriminate at the top; roughly 9 per cent of A Level entries achieved A* in 2025. Most international British schools also offer the Extended Project Qualification, an independent research piece that adds research signal in the way that the Extended Essay does for IB.

For the deeper background, see our IB curriculum guide and British curriculum guide.

Side by side comparison

Rigour, depth and breadth

If you take the dictionary definition of rigour as cognitive demand sustained across a sixth-form programme, IB and A Levels are comparable. They do not look comparable. The IB diploma demands sustained competence in six subjects, two of them languages and one of them mathematics, alongside three core requirements. The mental workload runs broad and continuous. A Levels in three subjects narrow the attention. The depth at A Level in those three subjects often runs deeper than the depth at IB HL, particularly in mathematics and the sciences, because there is simply more curriculum time per subject across the two years.

The honest summary is that A Levels permit greater specialist depth in three subjects, while the IB demands competence across six. Neither is academically soft. A child achieving 40 IB points and a child achieving A*A*A at A Level are both at the high end of the academically able cohort and would both be plausible candidates for any selective university. The pathways look different and the day to day load looks different, but the cognitive ceiling each demands at the top is broadly the same.

That said, IB compels the child to keep going in subjects they would otherwise drop. A child who is strong in humanities but weak in mathematics will have to sit Maths Studies or Maths Applications and Interpretations SL and reach a passing grade. A child who is strong in sciences but uncomfortable with creative writing will still have to write the Extended Essay. A Levels do not do that. They reward the specialist; they do not punish the lopsided.

University acceptance by destination

For UK universities, both qualifications are accepted on equivalent terms but read in different ways by admissions tutors. A typical Russell Group offer in A Level grades sits at AAB to A*AA depending on course and institution. The equivalent IB offer typically sits at 35 to 38 points with specified HL subjects, rising to 39 to 42 points at Oxford and Cambridge. Both Oxford and Cambridge publish published offer ranges in both qualifications; neither is penalised. UK admissions tutors read A Level transcripts intuitively because A Levels are their native qualification, but the IB diploma is now sufficiently familiar that they read it fluently too. The deeper issue is subject signalling: a UK admissions tutor for engineering wants to see Maths and Physics either at A Level or at IB HL, and either qualification can provide that. The IB diploma's six-subject breadth is sometimes interpreted as a softer signal of specialist depth in a chosen field; that interpretation is uneven and depends on the course and the tutor.

For US universities, the IB is the better-recognised international qualification. US selective admissions officers read the IB transcript fluently, treat HL 6s and 7s as strong signals of college readiness, and routinely award college credit for HL scores of 5 or above. A Levels are accepted, but the American admissions reader will normally want the SAT or ACT alongside predicted grades and may award patchier credit for A* subjects. A child targeting Ivy League and equivalent US universities is usually better served by the IB diploma than by a three-subject A Level set. A child targeting state flagships and good liberal arts colleges can go either way.

For Canadian universities, both are accepted on a clear conversion table. For Australian universities, both convert into ATAR equivalents and pose no obstacle. For European universities, the IB is the more strongly recognised qualification across Germany, the Netherlands, Switzerland, France and Scandinavia, where the diploma is treated as a near-native entry route. A Levels are accepted but more often demand conversion or additional subjects. See our IB vs British curriculum piece for the more detailed system view.

Which suits which child

The IB diploma suits a child who is academically broad, comfortable in two languages, comfortable in mathematics, and likely to find narrowing too early uncomfortable. It suits a child who likes structure and prescribed reading lists. It suits a family that has not yet decided which country the child will apply to from, because IB travels almost frictionlessly between selective universities in any continent. It suits a child whose interests are still evolving in Year 10 and Year 11 and who will benefit from the breadth of the diploma to find a direction.

A Levels suit a child who knows what they want to study, who is happy to put everything else down, and who values depth over range. A child who has decided early that they want to read medicine, engineering, law, classics or PPE can specialise relentlessly under A Levels and use the freed time on the depth and personal statement that competitive UK courses now demand. A Levels also suit a child who finds the forced breadth of the diploma a tax. If a child is strong in three subjects and indifferent to the rest, the IB will feel like dead weight on their schedule, and that drag can affect their grades in the three subjects that actually matter to them.

How well each travels

Both qualifications travel well, but with different footprints. The IB is present in more than 5,000 schools across 150 countries and is the lingua franca of mobile expat families. When a child moves from Singapore to Geneva to Sao Paulo, the IB diploma slots in cleanly because the syllabus is standardised globally. A Levels are offered at British international schools in every major expat hub and at the broader Cambridge International network of roughly 10,000 schools worldwide. A child moving between two British international schools can usually continue an A Level programme without disruption. A child moving from an IB school to a British school, or vice versa, mid-programme will have to switch system and that is rarely workable past mid-Year 12.

The same logic applies to teacher and resource depth. IB schools recruit globally for the diploma and have to invest in TOK coordinators, EE supervisors and a CAS programme that genuinely runs. A school that is delivering the IB seriously will have a recognisable IB culture from the senior leadership down. A British international school running A Levels rests on a more familiar set of patterns and can sometimes inherit a Year 13 teacher from a UK school overnight. When you tour a sixth form, ask the head of sixth which qualification the school's strongest results are in: that question reveals which system the school is set up to deliver well.

Which to pick if

If your child is targeting UK universities and has clear subject focus: A Levels. The native qualification offers the cleanest pathway and lets the child go deep in the three subjects that matter.

If your child is targeting US universities at the selective end: the IB diploma. The diploma's breadth maps cleanly onto US admissions expectations and onto college credit.

If your child is academically broad and dislikes being forced to narrow: the IB diploma. The required breadth is a feature for this child, not a tax.

If your child is a clear specialist who is allergic to forced breadth: A Levels. Three subjects, full depth, no compulsory dead weight.

If you may move countries mid-sixth-form: the IB diploma travels more cleanly between schools globally. A Levels travel cleanly only between British schools.

If your child wants to read medicine, dentistry or veterinary in the UK: A Levels remain the cleanest route. Chemistry plus Biology plus one further science or mathematics is the standard requirement, and the depth at A Level matches what UK admissions tutors are looking for.

If your child loves languages or wants a second language to a senior school standard: the IB. Two languages are compulsory and treated as serious academic subjects.

For families who have ruled in both systems, the next decision is often between IB and Advanced Placement at the American school. See our AP vs A Levels piece for the parallel discussion.

Costs worth knowing

School tuition dwarfs exam fees in either system and varies more by city and school than by curriculum. IB schools typically sit at the higher end of the international school fee table because the diploma is expensive to deliver well, requiring smaller teaching groups, two-language provision and a strong CAS supervision overhead. British international schools delivering A Levels sit across the full fee range, from value-tier campuses to flagship UK-brand schools. For exam fees specifically, the IB diploma costs roughly GBP 1,200 in registration and per-subject fees across six subjects; a three-subject A Level set costs roughly GBP 300 to GBP 450 in total at most international schools, plus practical or coursework moderation charges. For the city-level fee comparison, see our fees database.

The deeper cost is preparation. Some IB schools build the Extended Essay supervision and TOK provision into the core programme; some treat them as add-ons that families end up topping up with tutoring. Some A Level schools tutor heavily to A* in the sciences; others expect the child to manage the depth independently. Ask each school you visit which subjects in their cohort routinely produce the top grades, and which subjects need outside help to reach them. The honest answer reveals where the school invests and where it does not.

A final note on the registration timeline. Both qualifications require subject selection well before the start of Year 12. Most IB schools want subject choices finalised by February or March of Year 11; most A Level schools want them by April or May. Visit each school's sixth form open evening in the autumn term of Year 10 or Year 11. By the time the subject selection deadline arrives the decision will already feel settled, in either direction.

Related guides

• IB curriculum guide
• British curriculum guide
• IB vs British curriculum: the structural view