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IB Grade Boundaries Explained: How They Are Set and What They Mean
11th September, 2026 | Abhishek Malani | 08 Min Read
Introduction
If you’re on the road to achieving your IB Diploma, chances are you’ve heard of the IB Grade Boundaries. They’re certainly a hot topic of discussion among students planning their revision and anticipating their final scores, but what do they really mean?
At Quest For Success, we have put together a clear, detailed explanation of everything you need to know about IB Grade Boundaries. Read on to find out how these boundaries are calculated, what they are affected by, and how you can make the most of them while preparing for your assessments.
Table of Contents
What are IB Grade Boundaries?
To put it simply, a ‘grade boundary’ refers to the minimum raw mark required to achieve a certain grade between 1 to 7. It is not a fixed percentage across all subjects, and varies based on factors like the exam session, exam difficulty, and even each cohort’s overall performance. So, a raw mark of 75% could get you a 7 in one subject, but only a 6 in another.
How are IB Grade Boundaries calculated?
After all exam scripts are marked by examiners, the IBO conducts a Grade Award Meeting, where the grade boundaries are finalised. The Senior Examiners and Chief Examiners use two criteria to finalise the cutoffs:
- Statistical Evidence – They compare the current cohort’s scores with those of previous cohorts, to determine whether the assessments were easier or harder than intended.
- Judgemental Review – They review the scripts that fall on the proposed grade boundary to determine whether they align with the published grade descriptors (the standard of work expected of each candidate for a given grade).
Typically, a harder paper pulls grade boundaries lower, and a stronger cohort with an easier paper pushes them higher.
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What affects IB Grade Boundaries?
These boundaries can be influenced by a number of factors: the subject, the level of exam difficulty, the performance of the larger cohort, and even the sessions the exams are taken in.
For example, subjects with syllabi that have been recently revised tend to have fluctuating grade boundaries, as examiners need to determine the acceptable threshold that aligns with the grade descriptors.
On the other hand, subjects that rely more on coursework and Internal Assessments generally have more stable boundaries, as the IA scores can compensate for exam scores.
The boundaries even vary between the November and May sessions. This is because the November cohort is usually smaller, and skewed towards students who are retaking specific exams, or are following a different academic calendar.
How to access IB Grade Boundaries
The best way to understand grade boundaries is to approach your school’s IB Coordinator shortly after results day, as that is when all the relevant information is released to schools.
The IBO does not publicly release official PDFs with session-specific grade boundaries, but you can refer to their statistical bulletins to gain more information. These are released a few months after each exam session, and contain all the necessary details you need to better understand your score, and the grade boundaries.
How to utilise IB Grade Boundaries
Amid the stress of your assessment preparation, it’s easy to feel stressed out about meeting the grade boundaries. But, if you take a step back and learn to utilise this knowledge to your advantage, you can boost your preparation even more.
Don’t refer solely to the previous year’s boundaries as your point of reference. Instead, try to observe the fluctuations and trends between several years, and use that to establish your understanding of the subject and exam difficulty.
Always remember that the boundaries vary from year to year. So, instead of aiming for the exact cutoff score, treat it as the middle of the range, create a buffer, and target a higher score. This way, you can ensure that your score will fall within your target grade boundary.
You can also use the grade boundaries to determine where you fall in your preparation. If you find yourself scoring lower-than-ideal marks in your mock tests, you can assess where you are struggling in your prep, and improve your revision strategy to work on your problem areas.
How can Quest For Success help?
We at Quest For Success understand the struggles, stress, and confusion students face while preparing for their IB assessments, and we are here to help. We work with students and families to create personalised study plans, and offer a variety of specialist-led online IB classes to ensure that students are able to achieve the highest level of preparation.
If you find yourself struggling to meet your ideal grade boundaries, book a free demo session with us! Our expert mentors can help you identify your weak spots, and work with you to devise your ideal revision strategy, supplemented with one-to-one coaching sessions that cover all the information you need to ace your IB assessments.
Summary
IB Grade Boundaries are the minimum raw mark you need to achieve a certain grade from 1 to 7. They are calculated based on the comparative performances between current and past cohorts, along with a review by Senior and Chief Examiners to ensure that scripts which fall on the proposed boundaries align with the published grade descriptors. They can be affected by the overall cohort performance, the level of exam difficulty, and the different exam sessions. You can access these grade boundaries by speaking with your school’s IB Coordinator, or refer to the statistical bulletins shared by the IBO. These boundaries can help you set target scores, pinpoint your weaker subjects, and shape your preparation strategy.
FAQs
IB Grade Boundaries refer to the minimum raw mark required to achieve a certain grade from 1 to 7.
No, the grade boundaries are not determined by a fixed percentage. Instead, they vary from subject to subject based on the difficulty of the assessment, and the cohort’s overall performance. So, a raw score of 70% could result in a 7 in one subject, but a 6 in another.
After the exam scripts are marked, the Senior and Chief Examiners determine the grade boundaries. They use statistical evidence (such as the difference between the current and previous cohort’s performance), and judgemental review (where they revise the scripts that lie on the proposed boundary scores to ensure they align with the grade descriptors) to finalize the grade boundaries.
You can approach your school’s IB Coordinator a few days after results are published to understand the grade boundaries. While the IBO does not formally publish official PDFs with grade boundaries, they do share a helpful statistical bulletin a few months after each exam session.
You can utilise these boundaries to gain a better understanding of your performance, and set target scores for yourself. You can also use these to determine your weaker subject areas, and work on difficult concepts.
If you are struggling to reach your target grade boundary, contact us at to learn more about our personalised IB coaching program.
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