If you have ever walked out of an IB exam thinking, “I did… fine?” and then immediately spiraled into, “But what even counts as a 6 this year?”, you are not alone. IB grade boundaries are the quiet force that turns your raw marks into the final 1-7 grade universities see. And because boundaries move, they can make even strong students feel like they are aiming at a target that refuses to stand still.
What are IB grade boundaries?
IB grade boundaries are the minimum total marks needed to earn each final grade (1 through 7) in a specific subject and level (SL or HL), for a specific exam session. They are set after exams are marked, when the IB has real evidence of how difficult the papers were and how the global cohort performed.
If you want the cleanest place to explore real boundary tables, start with RevisionDojo’s IB Grade Boundaries hub, which lets you compare thresholds across sessions.
Why IB grade boundaries change every session
The key idea: IB grade boundaries are designed for fairness, not predictability.
Exam difficulty matters
If a paper is unusually tough, the IB typically lowers boundaries so students are not punished for sitting a harder-than-usual exam.
Cohort performance shifts
A stronger or weaker global cohort can nudge boundaries. The goal is to keep standards consistent across years, even when performance changes.
Subjects behave differently
Essay-heavy subjects can require higher percentages for the same grade than calculation-heavy subjects. That is why it helps to understand the wider grading system too: see What Is the Grading Scale for IB Exams? and Understanding the IB Grading System.
Typical percentages needed for a 7 (rough guide)
Boundaries vary, but recent trends often look like this for a top grade:
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Physics HL: ~68-72%
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Math AA SL: ~75-80%
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Chemistry SL: ~70-75%
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English A Literature HL: ~82-85%
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Biology HL: ~76-79%
The story here is not “memorize these numbers.” It is that IB performance is subject-shaped. An “easy” 80% in one course can be a tense borderline in another.
How your IB grade is calculated (and why boundaries are only the last step)
Your final IB subject grade comes from combining components like external exams and the Internal Assessment (IA) using the official weightings, then mapping that weighted total to grade boundaries.
If you want to translate practice scores into realistic grades, use the IB Grade Calculator. It is also worth understanding how your total diploma points work: How Do IB Points Work? and the broader Ultimate Guide to the IB Scoring System.
A quick IB grade boundary checklist (use this before you revise)
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Check boundaries for your exact subject, level, and session in IB Grade Boundaries.
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Aim for a buffer, not a perfect prediction (being 3-6 marks “safe” changes everything).
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Spend most time on repeatable marks: definitions, method steps, structure, and command terms.
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Train in exam conditions weekly using RevisionDojo’s Mock Exams and Predicted Papers.
To make this practical, RevisionDojo’s ecosystem is built like a loop: Study Notes, Flashcards, Questionbank, AI Chat, Grading tools, Predicted Papers, Mock Exams, Coursework Library, and Tutors. Boundaries tell you the target; these tools help you build the margin.
Closing: make IB grade boundaries work for you
IB grade boundaries are not a trick. They are a calibration tool. Your advantage comes from treating them as a map: learn the rough terrain, then build a buffer through better practice.
If you want the fastest way to do that, use RevisionDojo to connect the whole process: check IB Grade Boundaries, convert scores with the IB Grade Calculator, then improve with Study Notes, Flashcards, Questionbank, AI Chat, Grading tools, Predicted Papers, Mock Exams, Coursework Library, and Tutors. In the IB, calm consistency beats boundary obsession every time.