The Complete Parent’s Guide to IB Assessment and Grading: How the International Baccalaureate Scoring System Really Works

If your child is enrolled in an International Baccalaureate (IB) programme, or you are considering it, one of the first questions that comes to mind is probably: How does the grading actually work? The IB assessment system is quite different from what most parents experienced in their own school days, and it can feel overwhelming at first glance. But do not worry. Once you understand the core structure, it all makes a lot of sense, and you will be far better equipped to support your child through their IB journey.

In this guide, we will walk you through everything you need to know about IB assessment and grading, from the famous 45-point Diploma Programme (DP) scale to the criteria-based Middle Years Programme (MYP) and the formative approach of the Primary Years Programme (PYP). Whether your child is just starting out or preparing for their final exams, this article will give you a clear, practical understanding of how IB scoring works, what the numbers mean, and how they translate into university admissions.

The DP 45-Point System: A Complete Overview

The IB Diploma Programme (DP) is the most well-known of the three IB programmes, and its grading system is what most people refer to when they talk about “IB scores.” Here is how the 45-point maximum breaks down:

Six Subjects: Up to 42 Points

Candidates taking the full DP take six subjects, choosing from the following groups. Students taking individual DP subjects may take a different number, as permitted by their school. See the IB assessment FAQ for details.

• Group 1: Studies in Language and Literature (first language)
• Group 2: Language Acquisition (second language)
• Group 3: Individuals and Societies (history, economics, geography, etc.)
• Group 4: Sciences (biology, chemistry, physics, etc.)
• Group 5: Mathematics
• Group 6: The Arts (or an additional subject from Groups 1-5)

Each subject is graded on a scale of 1 to 7, with 7 being the highest. Full DP candidates take at least three Higher Level (HL) subjects and may take up to four; the remaining subjects are Standard Level (SL). Since a full DP includes six subjects, the maximum from subjects alone is 6 x 7 = 42 points. See the IB FAQ for counsellors, students and parents.

The Core: Up to 3 Bonus Points

On top of the six subjects, every DP student must complete three “Core” components:

• Theory of Knowledge (TOK)
• Extended Essay (EE)
• Creativity, Activity, Service (CAS)

TOK and the Extended Essay are each graded on a scale of A to E (A being the best). The combination of these two grades is then mapped onto a matrix that awards 0 to 3 bonus points. CAS is assessed on a pass/fail basis and does not contribute numerical points, but it must be completed to receive the diploma.

This means the maximum possible DP score is 42 + 3 = 45 points.

The TOK and EE Bonus Points Matrix

Many parents find the bonus point calculation confusing, so here is a simplified breakdown. The IBO uses an official matrix that combines your child’s TOK grade (A-E) with their EE grade (A-E) to determine the bonus points awarded:

TOK \ EE	A	B	C	D	E
A	3	3	2	2	Failing
B	3	2	2	1	Failing
C	2	2	1	0	Failing
D	2	1	0	0	Failing
E	Failing	Failing	Failing	Failing	Failing

As you can see, an E grade in either TOK or EE results in a failing condition for the diploma, regardless of other scores. This is an important detail that students and parents should keep in mind throughout the programme.

Subject Grades: Understanding the 1-7 Scale

The 1-7 grading scale is the backbone of DP assessment. But what do these numbers actually represent? Here is a practical guide:

Grade	General description
7	Highest grade
1	Lowest grade

The world average DP score is approximately 30 points out of 45. A score alone does not establish a student’s standing globally, and the available information here does not establish how often students achieve the maximum score. Interpret results in context rather than relying on a general ranking label.

Higher Level vs. Standard Level

While both HL and SL subjects are graded on the same 1-7 scale, there are important differences:

• Higher Level (HL): 240 recommended teaching hours; greater depth and complexity. University subject requirements vary, so check the official requirements for each intended university and programme.
• Standard Level (SL): 150 recommended teaching hours; covers the core curriculum without the same depth as HL.

Full DP candidates must take at least three HL subjects and no more than four, with the remaining subjects at SL. The choice of which subjects to take at HL is often influenced by university requirements and the student’s strengths and interests. Check the official requirements for each intended university and programme. For example, a student aiming for an engineering degree might take Mathematics and Physics at HL.

Core Components: TOK, Extended Essay, and CAS

The DP Core is what sets the International Baccalaureate apart from many other curricula. These three components develop critical thinking, independent research skills, and a commitment to community engagement.

Theory of Knowledge (TOK)

TOK is a course that explores how we know what we know. It encourages students to reflect on the nature of knowledge across different disciplines. Assessment includes a TOK exhibition and a TOK essay. TOK is graded on a scale of A to E:

• A: Excellent, showing sophisticated analysis and strong personal engagement
• B: Good, with clear analysis and appropriate examples
• C: Satisfactory, demonstrating basic understanding
• D: Below standard, with superficial treatment
• E: Very poor or not submitted (results in failing condition)

Extended Essay (EE)

The Extended Essay is an independent research paper of up to 4,000 words on a topic chosen by the student within one of their DP subjects. It is designed to develop academic research and writing skills that will be essential at university. The EE is also graded A to E using the same descriptors as TOK.

Parents often wonder how much support schools provide for the EE. While the level of guidance varies, every student is assigned a supervisor who provides feedback and direction. The key thing to understand is that this is genuinely independent work. Your child will choose their own research question and conduct their own investigation.

Creativity, Activity, Service (CAS)

CAS is perhaps the most misunderstood component. It is not graded numerically or with letter grades. Instead, it is assessed on a pass/fail basis. Students must demonstrate engagement in creative pursuits, physical activities, and community service over the course of their DP studies.

However, do not underestimate CAS. If a student fails to complete CAS requirements, they will not receive the IB Diploma, regardless of how well they perform in their six subjects and Core assessments. CAS requires students to maintain a portfolio of reflections and evidence of their activities, typically reviewed by a CAS coordinator at the school.

Internal Assessment vs. External Assessment

IB assessment includes internal and external assessment in many DP subjects, but the components and their assessment arrangements vary by subject. Check the current subject guide for the course details.

Internal Assessment (IA)

The proportion assigned to Internal Assessment varies by subject and level. Check the current subject guide for the weighting and assessment arrangements.

• Assessment arrangements vary: Depending on the subject, coursework may be assessed by the teacher and moderated by the IB, or externally assessed.
• Format varies by subject: It may be a research project, a scientific investigation, a mathematical exploration, an oral presentation, or a performance piece.
• Completed during the course: IA work is typically done during Year 1 and Year 2 of the DP, with specific deadlines set by each school.
• Check the subject guide: Weighting and assessment arrangements depend on the subject and level.

For parents, the important thing to know is that IA is a significant component. It is not just homework. Your child should treat IA deadlines with the same seriousness as exam dates. Schools often set internal deadlines well before the IBO submission dates, so it is worth knowing your school’s specific timeline.

External Assessment (EA)

The proportion assigned to External Assessment varies by subject and level. Check the current subject guide for the weighting and assessment arrangements.

• Examinations: Many DP courses include examinations, but formats and assessment arrangements vary by subject.
• Examination sessions: DP has May and November examination sessions. Check the current exam schedule and confirm your school’s session and subject format with the school coordinator.
• Exam format: The format varies by subject and may include different types of assessment.
• Marked externally: External assessment is marked by IB examiners.

The combination of IA and EA is designed to assess students in multiple ways, recognising that some students perform better on coursework while others excel under exam conditions. This balanced approach is one of the strengths of the IB system.

Diploma Award Requirements: What Your Child Needs to Pass

Earning the IB Diploma is not simply a matter of sitting the exams. There are specific conditions that must be met. Understanding these requirements is essential for parents so you can help your child stay on track.

Minimum Score Requirement

The minimum total score to be awarded the diploma is 24 points (out of 45). However, reaching 24 points alone is not sufficient. Several additional conditions must also be satisfied.

Complete Failing Conditions

A student will not be awarded the IB Diploma if any of the following apply:

• Fewer than 2 in any subject: every subject must receive at least 2
• Total score below 24 points
• No grade awarded in a subject, TOK or the Extended Essay: a grade must be awarded in all of them
• CAS requirements not completed
• Academic misconduct (plagiarism, cheating, or other integrity violations)
• Grade E in TOK or the Extended Essay (or both)
• More than three grades of 3 or below at any level
• More than two grades of 2 (SL or HL)
• Fewer than 12 points across HL subjects: for candidates taking four HL subjects, the three highest HL grades must total at least 12
• Fewer than 9 points across SL subjects (candidates taking two SL subjects must have at least 5 points at SL)

See the IB Diploma passing criteria for details.

Understanding the HL and SL Minimums

Candidates taking three HL subjects need at least 12 points across those HL subjects. For candidates taking four HL subjects, the three highest HL grades must total at least 12. Candidates taking three SL subjects need at least 9 points across those SL subjects; those taking two SL subjects need at least 5 points. These thresholds mean that students need to meet minimums across their subjects, not just rely on a few strong results.

As a parent, it helps to think of it this way: your child cannot afford to neglect any single subject entirely. Even if they are scoring 7s in their favourite subjects, a very low score in a weaker subject could prevent them from receiving the diploma.

What Happens If a Student Does Not Meet Diploma Requirements?

If a student does not meet the diploma conditions, DP Course Results may be issued. Individual subjects are graded on the 1-to-7 scale, with no universal subject pass grade. How universities treat these results varies, so check the official requirements of each intended university. Some students choose to retake specific subjects in a later examination session; ask the school coordinator about the applicable conditions. See the IB assessment FAQ and the IB university admission FAQ.

MYP Assessment: The Middle Years Programme (Ages 11-16)

The IB Middle Years Programme covers students aged 11 to 16 and uses a different assessment framework from the DP. If your child is in the MYP, here is what you need to know.

The 1-7 Scale with Criteria-Based Assessment

Like the DP, MYP subjects are graded from 1 to 7. However, the way these grades are determined is quite different. Each MYP subject is assessed against four criteria, labelled A through D. Each criterion is scored on a scale of 1 to 8 (with 8 being the highest).

The four criteria vary by subject but typically include elements such as:

• Criterion A: Knowing and understanding
• Criterion B: Investigating
• Criterion C: Communicating
• Criterion D: Thinking critically

The scores from the four criteria (each out of 8, totalling a maximum of 32) are then converted to a final 1-7 grade using IBO grade boundaries. This criteria-based approach means that students receive detailed feedback on specific aspects of their learning, not just a single number.

MYP Assessment Types

MYP assessment is primarily school-based, meaning teachers design and mark most assessments using IBO criteria. However, in the final year of the MYP (Year 5, typically age 15-16), schools may register students for:

• MYP eAssessment: An externally assessed on-screen examination
• Personal Project: A significant independent project that is externally moderated

For parents, the criteria-based system is actually very helpful because it clearly shows your child’s strengths and areas for development. If your child scores 7/8 on Criterion A (understanding) but 4/8 on Criterion C (communication), you can see exactly where they need to focus their efforts.

PYP Assessment: The Primary Years Programme (Ages 3-12)

The PYP is designed for younger learners aged 3 to 12, and its assessment philosophy is fundamentally different from both the MYP and DP.

No Numerical Grades

The PYP does not use numerical grades or letter grades. Instead, it relies on formative assessment, which is an ongoing process of observing, documenting, and reflecting on student learning. The focus is on:

• Learning journeys: Documenting how a student’s understanding develops over time
• Portfolios: Collections of student work that demonstrate growth and achievement
• Student-led conferences: Where children present their learning to parents, developing communication and self-reflection skills
• Teacher observations: Systematic records of student engagement, collaboration, and skills development

The PYP Exhibition

In the final year of the PYP, students undertake the PYP Exhibition, a collaborative inquiry project that represents the culmination of their primary education. This is a significant event where students identify a real-world issue, conduct research, and present their findings. Depending on the school’s assessment policy, formative or summative assessment and feedback may be part of the process.

What Parents Should Know

If you are used to seeing your child come home with percentage scores or letter grades, the PYP approach can feel unfamiliar. The key is to understand that PYP assessment is designed to nurture a love of learning and develop the whole child, rather than rank students against each other. School reports vary, so check your school’s assessment policy and ask to see a report sample.

IB emphasizes formative assessment as part of its approach to learning. As a parent, the most productive question to ask at parent-teacher conferences is not “What grade did they get?” but rather “How is my child developing as a learner, and what can we do at home to support them?”

IB Scores and University Admissions

For many families, the ultimate question is: How do IB scores translate into university offers? This is especially important for DP students. Here is a practical overview.

General Score Ranges and Competitiveness

There is no universal score-band table that predicts university selectivity or admission from a DP total. Universities set their own requirements, which may include total points, particular subjects, HL grades, minimum scores, and rules for predicted grades. Check the official requirements for each intended university and programme. IB recognition does not guarantee admission; see the IB university admissions guidance.

How Universities Use IB Scores

University admission requirements vary widely by country and institution, but here are some general patterns:

• Requirements vary: University admission, subject requirements, credit or advanced standing, and score conversions depend on the university, programme, and applicable admissions rules.
• Check current official information: Consult the intended university’s official admissions materials and contact it directly if any requirement is unclear. IB guidance also recommends checking university requirements individually: IB recognition guidance.

Important Tips for Parents

• Check specific requirements: Consult each intended university’s official materials for score, course, and subject requirements.
• Check subject choices: Confirm any required subjects and levels with the intended programme.
• Check application policies: Ask each university how it treats predicted grades and individual subject results.

Frequently Asked Questions

How are IB grades different from regular school grades?

Traditional school systems often grade on a percentage or letter-grade basis (A-F). The IB uses a criterion-referenced system, meaning grades are based on clearly defined learning objectives rather than comparing students against each other. A score of 7 means a student has demonstrated excellent understanding against the IB’s global standards, not that they are the top student in their class.

What is a “good” IB score?

What counts as a “good” score depends on your child’s goals and the requirements of each intended university and programme. Check the official admissions requirements, including any required subjects, levels, and minimum scores, rather than relying on a general score label.

Can my child retake IB exams?

Students can retake individual subject examinations in a later examination session, subject to IB rules. The number of subjects permitted and how universities consider results depend on the applicable rules and each university’s policies. Ask the school coordinator about retake conditions and check the official requirements of each intended university. See the IB assessment FAQ.

What happens if my child receives an E in TOK or the Extended Essay?

An E grade in either TOK or the Extended Essay is a failing condition for the diploma. DP Course Results may be issued, but this does not mean the student receives the diploma. Check the official requirements of each intended university. This is why it is important not to neglect these Core components, even when subject exams feel more pressing.

How is academic misconduct handled?

The IBO takes academic integrity extremely seriously. Misconduct, including plagiarism, collusion (inappropriate collaboration), and cheating during examinations, can result in a score of zero for the component or subject, or in severe cases, denial of the diploma entirely. Schools are required to educate students about academic integrity.

Does CAS affect the final score?

CAS does not contribute numerically to the 45-point total. However, CAS is a mandatory requirement for the diploma. If your child does not complete CAS satisfactorily, they cannot be awarded the diploma, no matter how high their subject scores are. Encourage your child to stay engaged with CAS activities throughout the two-year programme rather than trying to rush through requirements at the end.

How do Internal Assessment grades work?

Internal Assessment arrangements depend on the subject and level. Some coursework is assessed by the teacher and moderated by the IB, while some is externally assessed. Weightings also vary, so check the current subject guide for assessment details.

Is the MYP mandatory before the DP?

MYP completion is not a general IB requirement for entering the DP, but individual schools set their own admission and course requirements. Check the requirements of the school your child plans to attend. The IB assessment FAQ advises families to confirm school policies directly.

How can I support my child through IB assessments?

The most effective support parents can provide includes: helping maintain a healthy study-life balance, ensuring your child has a quiet study space and access to necessary resources, staying in communication with teachers about progress, understanding the assessment calendar and key deadlines, and providing emotional support during high-pressure exam periods. Avoid placing excessive pressure on achieving specific scores, as this can be counterproductive.

Summary: Key Takeaways for Parents

The IB assessment system is designed to be rigorous, fair, and internationally consistent. Here are the essential points every parent should remember:

• The DP maximum is 45 points: up to 42 from six subjects (each graded 1-7) plus up to 3 bonus points from the TOK and Extended Essay combination
• 24 points is the minimum for the diploma, with additional conditions: a grade must be awarded in all subjects, TOK and the EE; every subject must receive at least 2; no more than two subjects may receive a grade of 2; no more than three grades may be 3 or below; and candidates must meet the HL and SL minimums (for four HL subjects, the three highest grades count; candidates taking two SL subjects need at least 5 points)
• CAS is pass/fail but absolutely mandatory for the diploma
• Assessment arrangements vary by subject: Check the current subject guide for internal and external assessment details
• MYP uses criteria-based assessment (four criteria per subject, each scored 1-8, converted to a 1-7 final grade)
• PYP assessment focuses on student learning; check the school’s assessment policy and reporting practices
• University requirements vary: Check the official requirements of each intended university and programme

Understanding how IB grading works puts you in a much stronger position to support your child. You can have informed conversations with teachers, set realistic expectations together, and help your child plan their study time effectively. The IB is a demanding programme, but with the right understanding and support, it is also an incredibly rewarding educational experience that prepares students exceptionally well for university and beyond.

If you have specific questions about how a particular school implements IB assessment, we encourage you to reach out to the school’s IB Coordinator, who can provide details about assessment timelines, IA deadlines, and the school’s approach to supporting students through the examination process.