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Graduates
- Scored 40+ in the IB and 7s in the subjects they teach.
IB Grade Boundaries: A Complete Guide
This guide is designed for IB students and parents to demystify the entire IB grading process, from raw exam marks to the final 1-7 score.
At Lanterna, our expert tutors (who are all top IB graduates themselves) know that understanding how you're graded is just as important as knowing your subject content. This system can seem complex, but once you understand the rules, you can use them to your advantage.
By using this guide, you will be able to:
- Understand the hidden conditions for passing the IB Diploma (it's not just about 24 points!).
- See exactly how your raw exam and IA marks are converted into your final percentage.
- Learn the truth about how the IB sets grade boundaries (and why they change every year).
- Access projected grade boundaries for your subjects to set clear, strategic targets.
- Deploy elite-level strategies for your IAs, EE, TOK, and final exams to maximize your score.
The Architecture of Your IB Grade
The IB Diploma is scored out of 45 points. You can get a maximum of 7 points in each of your six subjects (totaling 42) and up to 3 bonus points from your Extended Essay (EE) and Theory of Knowledge (TOK).
It's Not Just About 24 Points: The IB's Failing Conditions
One of the biggest myths in the IB is that getting 24 points guarantees you the diploma. This is not true. The IB has several non-negotiable passing conditions. If you trigger any of them, the diploma will be withheld, no matter how many points you have.
Here are the rules you absolutely must follow:
| Awarding Requirement | Specific Condition for Failure or Diploma Withholding |
|---|---|
| Minimum Total Score | You achieve an overall score of fewer than 24 points. |
| Minimum Subject Grade | You are awarded a grade 1 in any subject, at either HL or SL. |
| Grade 2 Limitations | You receive more than two grade 2s across all subjects (HL or SL). |
| Grade 3 Limitations | You receive more than three grade 3s or below across all subjects (HL or SL). |
| Higher Level (HL) Threshold | You fail to achieve a minimum of 12 points across your three HL subjects. (For candidates taking four HL subjects, the three highest grades count). |
| Standard Level (SL) Threshold | You fail to achieve a minimum of 9 points across your three SL subjects. (For candidates with two SL subjects, you must gain at least 5 points). |
| Diploma Core (TOK and EE) | An elementary grade 'E' is awarded in either Theory of Knowledge or the Extended Essay. |
| Creativity, Activity, Service (CAS) | You fail to complete all required CAS reflections and components. |
| Academic Integrity | You receive a penalty for academic misconduct from the Final Award Committee. |
From Raw Marks to Final Grade: The Scaling Process
Your final grade in a subject isn’t a simple average. Each assessment component (like Paper 1, Paper 2, and your IA) has a specific percentage weighting. The IB converts your "raw mark" on each component into a "scaled mark" that reflects this weighting. These are then added up to give you a final percentage out of 100.
Let’s see how this works for Biology HL (new 2025/2026 syllabus). Paper 1 is worth 36%, Paper 2 is worth 44%, and the IA is worth 20%.
Imagine a student scores 60/75 on Paper 1, 65/80 on Paper 2, and 18/24 on their IA. Here’s the calculation:
| Assessment Component | Raw Score | Max Raw Score | Weighting | Scaled Mark Calculation | Scaled Contribution |
|---|---|---|---|---|---|
| Paper 1 (MCQ & Data) | 60 | 75 | 36% | (60 / 75) × 36 | 28.80% |
| Paper 2 (Extended Response) | 65 | 80 | 44% | (65 / 80) × 44 | 35.75% |
| Internal Assessment (IA) | 18 | 24 | 20% | (18 / 24) × 20 | 15.00% |
| Total Scaled Score | N/A | 179 | 100% | Sum of Contributions | 79.55% (Rounded to 80%) |
This final score of 80% is then compared to the official grade boundaries for that exam session to determine the final 1-7 grade.
The Truth About How Grade Boundaries Are Set
Myth: A 7 is always 80% or 90%.
Reality: IB grade boundaries are not fixed. They are set after everyone has taken the exams.
The IB does this to ensure fairness. If an exam paper is unusually difficult one year, the grade boundaries will be lowered. If it's easier, they'll be raised. This ensures that a 7 in Biology represents the same level of mastery this year as it did five years ago.
This is a highly controlled process:
- Standard Setting: Before marking begins, the Principal Examiner for each subject marks a set of "seed" scripts. These become the global standard.
- Examiner Monitoring: As thousands of examiners mark papers, the system secretly gives them these "seed" scripts to mark. If an examiner's marks are too different from the standard, they are locked out and retrained. This ensures your grade doesn't depend on which examiner you get.
- The Grade Award Meeting: After marking, senior examiners review statistical data and student performance. They ask: "Was this year's exam harder or easier than last year's?" Based on the evidence, they adjust the boundaries up or down to maintain the standard.
Projected Grade Boundaries: Setting Your Targets
Because boundaries are set after the exams, no one can give you the exact figures in advance. However, based on data from recent years, we can project the likely targets you should be aiming for. After the grade inflation during the pandemic, the IB has now returned to its rigorous pre-COVID standards. The targets below reflect this stable and demanding baseline.
Group 4: The Sciences
Science subjects often have the lowest boundaries for a 7. This doesn't mean they are easy; it means the exams are incredibly difficult. Physics HL, for example, is famous for its low boundaries due to the complexity of the problems.
| Science Subject | Projected Grade 7 Target | Projected Grade 6 Target | Projected Grade 5 Target |
|---|---|---|---|
| Biology HL | 76% – 80% | 62% – 66% | 50% – 54% |
| Biology SL | 76% – 77% | 62% – 64% | 50% – 52% |
| Chemistry HL | 74% – 76% | 62% – 64% | 50% – 52% |
| Chemistry SL | 71% – 73% | 59% – 61% | 48% – 50% |
| Physics HL | 67% – 73% | 59% – 61% | 48% – 50% |
| Physics SL | 71% – 73% | 60% – 61% | 49% – 50% |
Group 5: Mathematics
Maths Analysis & Approaches (AA) and Applications & Interpretation (AI) have very different boundary patterns. Because AA HL Paper 1 tests pure algebraic skill without a calculator, the boundaries are often lower. AI HL focuses on complex modelling and statistics, where unfamiliar problems can also lead to lower boundaries.
| Mathematics Subject | Projected Grade 7 Target | Projected Grade 6 Target | Projected Grade 5 Target |
|---|---|---|---|
| Math AA HL | 66% – 75% | 58% – 63% | 47% – 51% |
| Math AA SL | 74% – 76% | 61% – 63% | 47% – 49% |
| Math AI HL | 66% – 74% | 56% – 63% | 48% – 51% |
| Math AI SL | 75% – 77% | 63% – 65% | 50% – 52% |
Groups 1 and 3: Languages and Humanities
Subjects that rely on essay writing, like English, History, and Economics, consistently have the highest grade boundaries. Examiners are looking for precision, deep analysis, and sophisticated arguments, so you need a very high percentage to secure a 7.
| Humanities and Languages | Projected Grade 7 Target | Projected Grade 6 Target | Projected Grade 5 Target |
|---|---|---|---|
| English A Lang/Lit HL | 78% – 81% | 65% – 67% | 51% – 53% |
| English A Literature HL | 78% – 80% | 64% – 66% | 51% – 53% |
| Economics HL | 76% – 78% | 61% – 63% | 48% – 50% |
| History HL | 74% – 76% | 60% – 62% | 48% – 50% |
| Psychology HL | 73% – 75% | 63% – 65% | 52% – 54% |
The IA: Your Secret Weapon to Beat the Boundaries
Your Internal Assessment (IA) is the most controllable part of your final grade. It's your chance to score top marks before you even walk into the exam hall. Top students use their IAs to build a "boundary buffer," securing a near-perfect score to protect them from a tough exam paper.
The Lanterna Tip: Your only defense against moderation is to produce an IA that is so good, and follows the rubric so perfectly, that no external examiner can argue with the mark your teacher gave you. Aim for undeniable quality.
Insider Strategies for a Top-Tier IA
- Get Specific With Your Topic: A bad research question is "How does temperature affect enzyme activity?". A great one is "How does a temperature increase from 20°C to 50°C in 5°C increments influence the catalytic efficiency of amylase in the breakdown of a 1% starch solution, measured via iodine colorimetry?". Specificity is everything.
- New Science IAs (2025 onwards): The new IA is marked out of 24 and has a 3,000-word limit. The biggest mark-losers are data processing and evaluation. Don't just draw a line of best fit; propagate your uncertainties. And when evaluating, never mention "human error." Instead, quantify your sources of error.
- Design Technology IAs: Authenticity beats perfection. Examiners want to see your problem-solving journey. Documenting a failed prototype, analyzing why it failed, and then iterating a new solution will score much higher than presenting a simple, flawless product. Use annotated CAD models and photos to tell your story.
Mastering the Core for Those 3 Bonus Points
The 3 bonus points from TOK and the EE can be the difference-maker for your university offer.
- The Extended Essay: The EE is not a 4,000-word book report. Your score lives and dies by Criterion C: Critical Thinking (worth 35% of your grade). You must analyze, question, and evaluate your evidence. Also, take your RPPF (Reflections) form seriously. It's worth 6 easy marks if you show your intellectual journey, not just a logbook.
- Theory of Knowledge: Success in TOK comes from being specific. Avoid clichés and vague hypotheticals. Every argument must be tied to a real-world example, a specific historical event, or a scientific discovery. Use the precise TOK vocabulary (Areas of Knowledge, Knowledge Questions) to show the examiner you know what you're talking about.
Think Like an Examiner: Secrets to Scoring a 7
Getting a 6 is about knowing your content. Getting a 7 is about knowing how the exam is designed and what the examiner is trained to look for.
- Math AA HL (Paper 3): This paper is designed to be unfamiliar. It will combine topics in ways you've never seen. Don't panic. The questions follow a predictable arc. Show all your working because a correct answer from your calculator with no algebraic setup will get zero method marks.
- The Sciences (Command Terms): The number one reason students lose marks is misinterpreting command terms. "Describe" means you must quote data from the graph. "Explain" means you must provide the underlying scientific mechanism. They are not the same thing.
- English A (Paper 2): Do not use a pre-memorized essay. Examiners create specific prompts, and if you ignore the prompt, you'll be heavily penalized. The key to a 7 is a true comparative structure. Compare and contrast texts within the same paragraph, always linking back to the specific question.
The Lanterna Playbook: Your High-Performance Strategy
Top IB students don't just study hard; they study smart.
- Build a "Boundary Buffer": Never aim for the average grade boundary. If a 7 in Economics is usually 76%, set your personal target at 81%. This gives you a safety net for a hard exam or a moment of anxiety.
- Use an Analytical Error Log: When you lose a mark on a past paper, don't just move on. Log the error. Was it a knowledge gap? A misread question? A calculation mistake? By categorizing your mistakes, you can spot patterns and fix the root cause.
- Plan for Exam Day: Test anxiety is real and can block your memory. The best way to beat it is through repeated, timed mock exams under realistic conditions. It desensitizes you to the pressure. Sort out your logistics weeks in advance so your mental energy is 100% focused on the exam.
After Results Day: Remarks and Retakes
If you find yourself just one or two marks away from the next grade up, you can request an Enquiry Upon Results (EUR), or a remark. A senior examiner will re-mark your paper. This is a good strategy if you are close to the upper boundary, but be warned: your mark can go down as well as up.
If you miss a university condition, you can retake subjects in the next exam session. The IB will always take your highest grade achieved across any session. Even better, you can carry forward your original IA score, allowing you to focus 100% of your revision on the final exams.
