The IB Diploma Programme Explained: A Complete Parent Guide

Your child's school has offered them a place on the IB Diploma. You've heard it's rigorous, respected, and hard work. You've also heard words like TOK, CAS, HL, SL and "45 points" thrown around as if everyone already knows what they mean. Most parents don't. This guide explains the IB Diploma from the ground up — what it is, how it's built, how it's scored, what your child has to do to pass, and how to tell whether it's the right fit. Every number here comes from the IB's own published rules and results data.

Quick answer: The IB Diploma Programme (DP) is a two-year school qualification for students aged 16 to 19. Students study six subjects — one from each of five required groups, plus a sixth — and take three or four of them at higher level. On top of the six subjects they complete three "core" elements: Theory of Knowledge, a 4,000-word Extended Essay, and Creativity, Activity, Service. Each subject is graded 1 to 7, giving 42 points. The core adds up to 3 more. That makes 45 the maximum. Students need at least 24 points, plus a list of conditions, to be awarded the diploma. In the May 2026 session, 209,607 students received results and the global average was 30.88 points.

What is the IB Diploma?

The IB Diploma is a single, two-year qualification made up of six subjects and a three-part core, awarded by the International Baccalaureate. It isn't a bundle of separate certificates. Your child either earns the whole diploma or they don't.

That's the first thing that trips parents up. A-Levels and AP courses are modular — you collect them one at a time. The IB Diploma is one package. All six subjects and all three core parts have to be completed and passed together.

A few facts worth knowing:

• The DP was established in 1968. It was the IB's first programme.

• It was created by teachers at the International School of Geneva, with help from other international schools.

• It's designed for students aged 16 to 19 — roughly Year 12–13 in the UK system, or Grades 11–12 in the US system.

• As of July 2026, the DP is offered in more than 3,900 IB World Schools across 159 countries.

The IB also runs three other programmes: the Primary Years Programme (PYP) for ages 3–12, the Middle Years Programme (MYP) for ages 11–16, and the Career-related Programme (CP) for ages 16–19. The DP is the one that ends in the famous score out of 45.

If your child is coming from IGCSE or MYP, the jump is real. The DP asks for independent research, extended writing, and reflection on top of subject content. Most students feel it in the first term, not at exam time.

How the IB Diploma is built: six subjects plus a core

Every IB Diploma student takes six subjects and three core components. There is no version of the diploma with five subjects or two core parts.

Here's the whole structure on one page:

TOK and EE together are worth up to 3 bonus points. CAS earns no points at all, but skipping it means no diploma. More on that below.

The six subject groups

Students pick one subject from each of the first five groups. The sixth subject comes from the arts — or, if they prefer, a second subject from sciences, individuals and societies, or languages.

Two useful rules most parents don't hear about:

1. A second group 1 language can replace group 2. Bilingual students often do this. It also opens the door to a bilingual diploma.

2. Some subjects count for two groups at once. Environmental systems and societies (ESS) satisfies both group 3 and group 4. Literature and performance covers group 1 and group 6. These are called interdisciplinary subjects, and they free up a slot.

Maths is the choice that causes the most family arguments. AA is the proof-and-calculus route; AI is the modelling-and-statistics route. Neither is "the easy one" — they suit different students and different degrees. Our full breakdown of every IB subject on offer goes group by group, and explains which combinations universities expect.

Higher level and standard level

Every subject is taken at either higher level (HL) or standard level (SL). Students take three or four at HL and the rest at SL.

That last row surprises people. A 7 at SL and a 7 at HL are both worth 7 points. HL subjects only matter separately in the passing conditions, where students need at least 12 points across their HL subjects.

The practical advice from Educifly's IB specialists, who have tutored DP students since 2018: pick HL subjects for the degree your child is aiming at, not for the grade they think will come easiest. Universities read the HL subjects first.

The DP core: TOK, EE and CAS

The core is the part that makes the IB Diploma different from every other school qualification. It's also the part families underestimate.

Theory of Knowledge (TOK) is a course about knowledge itself. Students ask how we know things in science, history, maths and the arts, and where each way of knowing breaks down. It runs across both years, is assessed by an essay and an exhibition, and is graded A to E. It is not an optional discussion class — a grade E in TOK stops the diploma being awarded. We've written a plain-English explainer on what TOK actually is and how it's assessed.

The Extended Essay (EE) is an independent research paper of up to 4,000 words, on a topic your child chooses, supervised by a teacher. It's usually written in one of their six subjects. Most students start in the spring of year one and submit in the winter of year two. It's graded A to E. In the May 2025 session, English A, history and business management were the three most popular EE subjects. Students who struggle here usually struggle with the research question, not the writing — which is why Extended Essay coaching tends to pay off early rather than late.

Creativity, Activity, Service (CAS) runs across all two years. Students take part in creative pursuits, physical activity, and unpaid service, and reflect on what they learned. There's no grade and no points. There is a required CAS project, and seven learning outcomes students must show evidence of. Fail to complete CAS and the diploma is not awarded, no matter how many points were scored. Our guide to CAS explains what counts, what doesn't, and how to keep the reflections manageable.

How the IB Diploma is scored out of 45

The IB Diploma score is the sum of six subject grades (1–7 each, so 42 maximum) plus up to 3 points from TOK and the Extended Essay. The maximum is 45.

Every subject grade is set against fixed standards, not against other students. There's no curve and no quota. If every student in the world met the grade 7 standard, every student would get a 7.

The core points matrix

TOK and EE grades combine in a fixed table. This is published by the IB and doesn't change year to year.

Read it like a grid. A B in TOK and a C in the EE gives 2 points. An E in either one is a failing condition — the diploma is not awarded, whatever the total.

Most students land on 1 or 2 core points. In May 2025, 43.8% of diploma candidates earned 2 core points, 25.2% earned 1, 17.8% earned none, and only 12.2% earned all 3. The mean was 1.5. Treating the core as "free points" is the single most common planning mistake we see. For a worked walkthrough of the arithmetic, see how the IB points system works.

What counts as a good IB Diploma score

There's no official answer, but the global data gives a clear picture. These are the final figures for the May 2025 session, published by the IB.

The global average total for May 2025 was 30.6 points. For May 2026 it rose to 30.88 points. So a 30 is genuinely average, a 35 puts a student in the top third, and a 40 puts them in the top 10%.

One more useful number: the mean subject grade in May 2025 was 4.9. A grade 5 in a subject is normal. A 7 is not — across all subjects and levels, only 8.3% of grades awarded were 7s.

What your child must do to actually earn the diploma

Twenty-four points is the minimum, but points alone aren't enough. The IB publishes eight conditions, and all of them must be met.

Add to that the core rule: a grade E in TOK or the Extended Essay is a failing condition on its own.

This is why a student can score 28 points and still not be awarded the diploma. It happens. In May 2025, 3,592 candidates scored between 24 and 29 points and were still not awarded the diploma — that's 19.4% of everyone who missed out. Almost always it's a single low grade or an incomplete core component, not a low total.

The takeaway for parents: watch the weakest subject, not the average. One subject drifting toward a 2 is a bigger threat to the diploma than three subjects drifting from 6 to 5.

Who the IB Diploma is for — and who it isn't

The IB Diploma suits students who are broadly capable across subjects, organised enough to juggle long deadlines, and happy to keep studying maths and a language until 18.

It tends to work well for:

• Students who don't yet know what they want to study at university

• Students moving between countries or school systems

• Strong all-rounders who'd be bored dropping to three subjects

• Students who like writing, research and discussion

It's a harder fit for:

• Students who are excellent at two or three things and weak elsewhere

• Students who want to drop maths entirely at 16

• Students who need one deadline at a time to function

• Students aiming at a very narrow specialism early

None of this is about intelligence. The IB Diploma punishes narrowness, not weakness. A student who could get A*A*A in three A-Level sciences can still struggle to clear 30 points if their second language and their EE go badly.

You don't have to take the full diploma

This is the option almost nobody mentions. Students can take individual DP subjects as a course candidate instead of registering for the full diploma. They sit the same exams and get the same 1–7 grades. They just don't do all six subjects and the full core, so no diploma is awarded.

It's more common than you'd think. In May 2025, 64,972 students were registered as course candidates — 32.1% of everyone taking IB assessments that session.

This is a genuine safety valve. If your child is thriving in four subjects and drowning in two, ask the IB coordinator about switching to courses before results are at risk. It's a planning decision, not a failure.

How the IB Diploma compares to A-Levels and AP

The IB Diploma is broader and more prescriptive; A-Levels and AP are narrower and more flexible. That's the whole comparison in one sentence.

Universities in the UK, US, Europe and Asia recognise all three. The IB Diploma's advantage is breadth and the research training. Its cost is that a weak area can't be hidden.

What the two years actually look like

Knowing the rhythm helps more than knowing the rules. Here's the typical shape, though schools vary.

Two pressure points show up in almost every family. The first is the winter of year two, when the EE deadline, TOK essay and several internal assessments all land within weeks. The second is the February mock season, because those results feed the predicted grades universities see.

The IB runs two exam sessions a year — May and November. Northern hemisphere schools sit the May session; southern hemisphere schools usually sit November. May 2026 results were released on 6 July 2026.

What's changing in the IB Diploma

The IB is running a multi-year review of both the DP and the Career-related Programme, with new versions planned to launch in 2030. Nothing changes for students starting the DP in 2026 or 2027.

The review is piloting three things with partner schools: digital portfolios built around CAS, "extended experiences" that cut across subjects, and alternative forms of assessment. The stated aims are more flexibility, more student choice, and a serious answer to what AI means for teaching and assessment.

For families choosing a school today, this is background noise rather than a reason to wait. Individual subject guides also get reviewed on a rolling cycle, which is why exam formats shift for particular subjects from year to year — always check the current subject guide, not an older one.

How to help your child do well in the IB Diploma

Parents can't write the essays. But the highest-scoring students tend to have the same few habits, and those are worth backing at home.

1. Protect the core from the start. TOK and the EE are worth up to 3 points and can end the diploma outright. Treat their deadlines as seriously as exam dates.

2. Log CAS as you go. Reflections written months late are painful and low quality. Fifteen minutes a week prevents a crisis in year two.

3. Watch the weakest subject. The passing conditions punish one bad grade far more than a slightly lower average.

4. Start internal assessments early. Every subject has coursework worth 20–30% of the final grade. Students who draft early and revise once outperform students who write once, late.

5. Use past papers with mark schemes. Not to memorise questions — to learn what the command terms are actually asking for.

6. Get help before the grade slips, not after. A subject drifting from 5 to 4 is a two-session fix. From 4 to 3, after mocks, it's a much bigger job.

If your child is aiming for a specific score and isn't sure the gap is closeable, that's exactly what a subject specialist is for. An honest read on what the remaining months can realistically deliver is worth more than another revision timetable.

Frequently asked questions about the IB Diploma

What is the IB Diploma?

The IB Diploma is a two-year qualification for students aged 16 to 19, awarded by the International Baccalaureate. Students study six subjects and complete three core components: Theory of Knowledge, a 4,000-word Extended Essay, and Creativity, Activity, Service. It's scored out of 45 points and is recognised by universities worldwide.

It's one combined qualification, not a set of separate certificates. A student either earns the full diploma or doesn't.

How many points do you need to pass the IB Diploma?

You need at least 24 points out of 45. But points alone aren't enough — the IB also requires that CAS is completed, that a grade is awarded in every subject plus TOK and the Extended Essay, that there's no grade 1, no more than two grade 2s, no more than three grades of 3 or below, at least 12 points across higher level subjects, and at least 9 points across standard level subjects.

A grade E in TOK or the Extended Essay is a failing condition by itself, whatever the total.

Is the IB Diploma harder than A-Levels?

It's broader, not simply harder. A-Level students usually take three subjects and can drop maths and languages at 16. IB Diploma students take six subjects, must continue maths and a second language, and complete a 4,000-word research essay and a service requirement on top.

For a strong all-rounder, the IB often feels more manageable. For a student who is excellent in two or three areas and weak elsewhere, A-Levels usually allow a higher headline result.

How many subjects do you take in the IB Diploma?

Six. One from studies in language and literature, one from language acquisition, one from individuals and societies, one from sciences, and one from mathematics. The sixth is normally from the arts, but students can swap it for a second subject from sciences, individuals and societies, or languages.

Three or four of the six are taken at higher level; the rest at standard level.

What is the difference between HL and SL in the IB?

Higher level (HL) subjects run for 240 teaching hours; standard level (SL) subjects run for 150. HL covers more content in more depth and has harder exams. Both are graded 1 to 7, and a point is worth the same at either level.

The one place the difference matters formally is the passing conditions: students need at least 12 points across their HL subjects and at least 9 across their SL subjects.

What is the IB core?

The IB core is the set of three components every diploma student must complete alongside their six subjects: Theory of Knowledge (TOK), the Extended Essay (EE), and Creativity, Activity, Service (CAS).

TOK and the EE are each graded A to E and combine for up to 3 bonus points. CAS earns no points but must be completed, or the diploma isn't awarded.

Can you fail the IB Diploma even with more than 24 points?

Yes. In the May 2025 session, 3,592 candidates scored between 24 and 29 points and were still not awarded the diploma.

The usual causes are a single grade 1, too many grade 2s or 3s, fewer than 12 points across higher level subjects, an incomplete CAS record, or a grade E in TOK or the Extended Essay.

What is a good IB Diploma score?

The global average was 30.88 points in May 2026 and 30.6 in May 2025, so anything above 31 is above average. In May 2025, 20.4% of candidates scored 35–39 and 9.8% scored 40–45.

As a rough guide: 30–34 is solid, 35–39 is strong and opens most selective universities, and 40+ is competitive for the most selective courses including Oxbridge and top medicine.

How old are IB Diploma students?

The Diploma Programme is for students aged 16 to 19. It's a two-year course, so students typically start at 16 and finish at 18. That maps to Year 12 and Year 13 in the UK system, and Grades 11 and 12 in the US system.

The IB's Career-related Programme (CP) covers the same age group but combines academic study with career-related learning.

Do universities accept the IB Diploma?

Yes. The IB Diploma is accepted by universities in the UK, US, Canada, Europe, Australia and across Asia. In the UK it converts to UCAS tariff points, and offers are usually written as a total score plus specific higher level grades — for example "38 points overall including 6,6,6 at HL".

Many US universities also award course credit for higher level subjects scored at 5 or above, though the policy varies by institution.

What if my child doesn't want the full IB Diploma?

They can register as a course candidate instead. Course candidates take individual DP subjects, sit the same exams and receive the same 1–7 grades, but don't complete all six subjects and the full core — so no diploma is awarded.

It's common. In May 2025, 64,972 students took IB assessments as course candidates, which is 32.1% of all candidates that session. Talk to your school's IB coordinator early if this looks like the better route.

When do IB Diploma exams take place?

There are two exam sessions each year. The May session runs from late April into May, and results are released in early July. The November session runs from late October into November, with results in early January.

Northern hemisphere schools normally use the May session, and southern hemisphere schools the November session. May 2026 results were released on 6 July 2026.

Educifly is a boutique 1-on-1 tutoring practice for IB Diploma, IB MYP and IGCSE students, founded in 2018. Every tutor is a subject specialist, and students keep the same tutor throughout. If you'd like a specialist read on your child's IB Diploma plan, book a free trial class.