The International Baccalaureate Diploma Programme (IBDP) is a two-year pre-university programme for students aged 16 to 19. Students typically study six subjects alongside Theory of Knowledge (TOK), the Extended Essay (EE), and Creativity, Activity, Service (CAS).
The maximum IB Diploma score is 45 points: up to 42 points from six subjects and up to 3 additional points from TOK and the Extended Essay.
This guide explains how the IB Diploma works, how its 45-point scoring system is calculated, the difference between Higher Level (HL) and Standard Level (SL), the IB Core, passing requirements, and how the IB compares with Singapore's A-Level pathway.
For Singapore students and parents comparing IB, A-Level, and other pre-university pathways.
What is the IB Diploma Programme?
The International Baccalaureate Diploma Programme, commonly called the IB or IBDP, is an internationally recognised pre-university programme designed for students aged 16 to 19.
The programme usually lasts two years and combines academic subjects with independent research, critical thinking and activities outside the traditional classroom.
Unlike programmes that allow students to specialise narrowly, the full IB Diploma requires students to maintain breadth across several subject areas.
Students study languages, individuals and societies, sciences and mathematics while also completing the three components of the DP Core:
- Theory of Knowledge (TOK)
- Extended Essay (EE)
- Creativity, Activity, Service (CAS)
This combination of breadth and depth is one of the main characteristics that distinguishes the IB Diploma from other pre-university pathways.
How is the IB Diploma structured?
IB Diploma students take six academic subjects.
Students must cover several subject groups:
| Group | Subject Area | Examples |
|---|---|---|
| 1 | Studies in Language and Literature | Language A: Literature, Language A: Language and Literature |
| 2 | Language Acquisition | Language B, Language ab initio and other options |
| 3 | Individuals and Societies | Economics, Business Management, Geography, History, Psychology |
| 4 | Sciences | Biology, Chemistry, Physics, Computer Science and other sciences |
| 5 | Mathematics | Mathematics: Analysis and Approaches (AA), Mathematics: Applications and Interpretation (AI) |
| 6 | The Arts | Visual Arts, Music, Theatre and other arts subjects |
Students have some flexibility within this structure. For example, an Arts subject does not always have to be the student's sixth subject. Depending on the programme rules and what their school offers, students may be able to select another eligible subject instead.
There are also specific rules and interdisciplinary options that can affect how the six-subject requirement is fulfilled.
This means students should choose their subjects with their school's IB coordinator rather than relying only on a generic six-group template.
What is the difference between Higher Level and Standard Level?
IB subjects can be taken at Higher Level (HL) or Standard Level (SL).
Students normally take three HL and three SL subjects, although IB rules permit some candidates to take four HL subjects and two SL subjects.
The IB recommends approximately:
- 240 teaching hours for each HL subject
- 150 teaching hours for each SL subject
HL subjects therefore generally cover a greater body of knowledge, understanding and skills.
One important point is that HL subjects are not worth more IB Diploma points than SL subjects.
Both are graded on the same 1–7 scale.
An HL grade 7 contributes seven points to the Diploma total, and an SL grade 7 also contributes seven points.
The difference is the level and scope of study, not the maximum number of Diploma points available.
This makes HL selection particularly important. Universities may require specific subjects at HL for certain degree programmes, so students should consider their possible university choices before finalising their combination.
How is the IB scored out of 45?
The full IB Diploma has a maximum score of 45 points.
Each of the six academic subjects is graded from 1 to 7, where 7 is the highest grade.
| IB Grade | Points |
|---|---|
| 7 | 7 |
| 6 | 6 |
| 5 | 5 |
| 4 | 4 |
| 3 | 3 |
| 2 | 2 |
| 1 | 1 |
With six subjects, a student can therefore earn:
6 × 7 = 42 subject points
Students can then earn up to 3 additional points through their combined performance in Theory of Knowledge and the Extended Essay.
That gives the maximum:
42 subject points + 3 core points = 45 points
CAS does not add points to the 45-point total, but students must meet the CAS requirements to receive the Diploma.
Example of an IB score calculation
Consider this student:
| Subject | Level | Grade | Points |
|---|---|---|---|
| Mathematics: AA | HL | 6 | 6 |
| Chemistry | HL | 7 | 7 |
| Economics | HL | 6 | 6 |
| English A | SL | 6 | 6 |
| Language B | SL | 6 | 6 |
| Biology | SL | 7 | 7 |
| Subject total | 38 | ||
| TOK + EE core points | 2 | ||
| Final IB score | 40/45 |
The student's final IB Diploma score would therefore be 40 points out of 45.
How do TOK and Extended Essay points work?
Theory of Knowledge and the Extended Essay are each graded from A to E.
Their grades are combined using the IB's core points matrix and can contribute 0 to 3 additional points to the Diploma score.
For example, some strong combinations of TOK and EE results can produce the maximum three core points.
The important distinction is that these are combined core points. TOK does not independently provide three bonus points and the Extended Essay another three.
Together, the two components can contribute a maximum of 3 points.
An E in either TOK or the Extended Essay is a failing condition for the Diploma under the current IB passing criteria.
CAS is handled differently. It does not receive a grade that contributes to the 45-point total, but its requirements must be completed.
What do you need to pass the IB Diploma?
Students need at least 24 total points to be eligible for the IB Diploma, but scoring 24 points does not automatically guarantee that the Diploma will be awarded.
Students must also satisfy the IB's other passing conditions.
Under the current criteria, these include:
- completing CAS requirements;
- achieving at least 24 total points;
- receiving grades for all six subjects, TOK and the Extended Essay;
- receiving at least a grade D in both TOK and the Extended Essay;
- not receiving a grade 1 in any subject;
- having no more than two grade 2s;
- having no more than three grades of 3 or below;
- achieving at least 12 points across HL subjects; and
- achieving the required minimum total across SL subjects.
For students taking the usual three-HL, three-SL combination, at least 9 points must be achieved across the SL subjects.
This is why simply saying "24 points is a pass" can be misleading.
A student can reach 24 or more points and still fail to receive the Diploma if one of the other minimum conditions is not met.
What are TOK, the Extended Essay and CAS?
The three components of the IB Core are a defining part of the Diploma Programme.
Theory of Knowledge (TOK)
Theory of Knowledge encourages students to examine questions about knowledge itself: how knowledge is created, justified, interpreted and challenged.
Rather than focusing on a single academic discipline, TOK asks students to reflect on how we know what we claim to know.
Under the current programme, TOK is assessed through an exhibition and a 1,600-word essay.
TOK is graded from A to E and combines with the Extended Essay grade to determine the student's core points.
Extended Essay (EE)
The Extended Essay is an independent research project culminating in a 4,000-word paper.
Students investigate a focused research question and develop skills such as research, argumentation, analysis, evaluation and academic communication.
For many students, the Extended Essay is their first substantial experience of the type of independent research expected at university.
Like TOK, the EE is graded from A to E and contributes to the combined core points calculation.
Creativity, Activity, Service (CAS)
CAS encourages students to participate in experiences across three areas:
Creativity — exploring and extending ideas through creative activity.
Activity — physical exertion contributing to a healthy lifestyle.
Service — collaborative and reciprocal engagement with the community in response to an authentic need.
CAS does not contribute numerical points to the final 45-point score.
However, fulfilling CAS requirements is necessary for the award of the IB Diploma.
How are IB subjects assessed?
The IB uses a combination of external and internal assessment.
For most subjects, written examinations taken towards the end of the programme form an important part of the final assessment.
Students also complete assessment tasks during their course.
Depending on the subject, these may include written work, investigations, oral components, performances or other subject-specific tasks.
Some assessment components are marked externally. Others are marked by teachers and moderated by the IB to maintain consistent standards.
This means IB preparation should not focus exclusively on final examinations.
Students need to manage both their ongoing assessed work and their examination preparation across the two-year programme.
How important are IB subject choices for university?
Subject choice can be extremely important because universities may require particular subjects or levels for specific degree programmes.
A student interested in a science, engineering or mathematics-related degree, for example, may face different subject prerequisites from someone interested in law, business or the humanities.
This is especially important when choosing Higher Level subjects.
A high overall IB score does not necessarily compensate for failing to take a subject required by a particular university course.
Students should therefore consider:
- Which subjects are they strongest in?
- Which university courses might they consider?
- Do those courses require specific HL subjects?
- Can they realistically manage the proposed HL combination?
Students applying to universities in Singapore should check the current requirements of each university and programme before making important subject-selection decisions.
For example, NUS accepts the IB Diploma for undergraduate admission but also requires applicants to meet the prerequisites of the programmes they apply to. Some applicants may have additional Mother Tongue Language requirements.
Is a higher IB score always better for university admission?
A higher IB score generally strengthens the academic side of an application, but there is no single IB score that guarantees admission to every university course.
Admission depends on the university, programme and applicant pool.
Some programmes may also have:
- subject prerequisites;
- minimum HL requirements;
- interviews;
- admissions tests; or
- consideration of non-academic achievements.
Students should therefore avoid treating figures they see online as guaranteed university cut-offs.
Instead, use official university admissions information to understand both the academic profile and the specific prerequisites for the course.
IB or A-Levels: which is better?
Neither the IB nor Singapore A-Levels is automatically better.
The more suitable programme depends on the student.
| IB Diploma | Singapore A-Levels |
|---|---|
| Six academic subjects | Greater specialisation in fewer content subjects |
| Usually 3 HL + 3 SL | Subjects offered at H1, H2 and H3 levels |
| Includes TOK, EE and CAS | Includes General Paper and Project Work |
| Maximum 45 points | Revised UAS maximum of 70 points |
| Significant coursework and internal assessment | Strong emphasis on subject examinations |
| Broad curriculum | Greater opportunity for subject specialisation |
The IB may suit students who enjoy breadth, independent research, ongoing assessment and balancing several different areas of study.
The A-Level pathway may suit students who prefer greater specialisation in fewer academic subjects.
However, neither description should be treated as a rule. Students can thrive or struggle in either programme depending on their strengths, interests, study habits and subject choices.
Families comparing the two pathways can also read our guide to A-Level rank points.
For younger students still navigating secondary education, our Singapore O-Level guide explains O-Level grades, aggregate scores, Full Subject-Based Banding and the transition to the SEC.
How challenging is the IB Diploma?
The IB Diploma can be demanding because students have to balance six subjects, internal assessment, examinations, TOK, the Extended Essay and CAS over two years.
The challenge is therefore not purely academic.
Time management can become just as important as subject knowledge.
A student may understand Mathematics or Chemistry well but still struggle if several major deadlines accumulate at the same time.
Students who manage the programme effectively tend to build consistent routines rather than relying entirely on intense revision immediately before examinations.
That means keeping track of deadlines, beginning major assignments early, reviewing weak topics regularly and asking for help before gaps become difficult to correct.
How can students prepare well for IB?
Strong IB preparation starts with consistent study and realistic planning across the entire programme.
Students can:
- Choose HL subjects carefully. Consider both academic strengths and possible university prerequisites.
- Build a weekly routine across all six subjects. Avoid allowing stronger or more enjoyable subjects to consume all available study time.
- Track assessment deadlines in one place. Internal assessments, TOK and the Extended Essay should not be treated as separate last-minute projects.
- Start the Extended Essay early. Good research questions and arguments usually improve through multiple rounds of research and refinement.
- Use subject-specific examination practice. IB Mathematics, Chemistry and Economics require different approaches.
- Review feedback carefully. Look for recurring weaknesses rather than simply recording the final mark.
- Ask for help early. Small conceptual gaps can become more difficult to manage once coursework and examination preparation overlap.
For students struggling with a particular subject, targeted support can be more useful than simply adding more study hours.
Students can compare all IB tutors in Singapore or browse subject-specific options such as IB Mathematics tutors and IB Chemistry tutors.
Frequently asked questions about the IB Diploma
What is the highest possible IB score?
The maximum IB Diploma score is 45 points. Students can earn up to 42 points from their six subjects and up to 3 additional points from their combined TOK and Extended Essay results.
How many points do you need to pass the IB?
Students need at least 24 total points, but 24 points alone does not guarantee the Diploma. Candidates must also meet the IB's other passing requirements, including minimum performance conditions and completion of CAS.
Is 7 the highest IB subject grade?
Yes. Individual IB subjects are graded from 7 to 1, with 7 being the highest.
Are HL subjects worth more points than SL subjects?
No. Both HL and SL subjects are graded on the same 1–7 scale and contribute the same maximum of seven points per subject to the Diploma total. HL subjects differ in scope and recommended teaching hours.
How many HL subjects do IB students take?
Most Diploma students take three HL subjects and three SL subjects. IB rules also allow some students to take four HL subjects and two SL subjects.
Does CAS add points to your IB score?
No. CAS does not add numerical points to the 45-point total. However, students must satisfy the CAS requirements to receive the IB Diploma.
How many points can TOK and the Extended Essay add?
TOK and the Extended Essay can contribute up to three additional points combined. They do not provide three points each.
How long is the Extended Essay?
The Extended Essay is an independent research project culminating in a 4,000-word paper.
Is the IB harder than A-Levels?
There is no objective answer that applies to every student. The IB requires breadth across six subjects alongside TOK, EE and CAS, while Singapore A-Levels allow greater specialisation. Which feels harder depends on the student's strengths, subject choices and approach to learning.
Choosing the right IB pathway
Understanding how the IB Diploma Programme works is important before choosing subjects or comparing it with other pre-university options.
The basic scoring system is straightforward: six subjects can contribute up to 42 points, while TOK and the Extended Essay can add up to 3 core points, producing a maximum score of 45.
But succeeding in the IB involves more than chasing a total score.
Students need to choose appropriate HL subjects, meet Diploma requirements, manage ongoing assessments, complete the DP Core and make sure their subject combination supports their possible university plans.
For Singapore students considering local universities, checking current programme prerequisites early can prevent subject-selection problems later.
Useful official references
For current information, students and parents should refer to official IB and university sources:
- International Baccalaureate — Diploma Programme
- International Baccalaureate — DP Curriculum
- International Baccalaureate — DP Assessment and Passing Criteria
- NUS — IB Diploma Admission Requirements
- NTU — International Baccalaureate Diploma Admissions
Programme and university requirements can change, so students should verify important decisions against the current requirements of the IB, their school and the universities they are considering.