IGCSE Grade Conversion Chart: How Percentages Map to Letter Grades
Talimat Academic Team
Education Specialist
IGCSE grades are not fixed to percentage thresholds. Cambridge and Edexcel set grade boundaries after each exam series based on overall paper difficulty, meaning a raw score of 70% could earn an A* in one subject and a B in another. This guide shows you how the system works and what it means for your results in 2026.
Understanding your IGCSE grade conversion chart is one of the most practical things a student or parent can do before results day. Raw marks alone tell you very little. What matters is where Cambridge or Edexcel draws the boundary lines after marking is complete.
An IGCSE grade conversion chart is a tool that maps raw marks or percentage scores to the official letter grades (A* through G, or 9 through 1 for Edexcel) set by the awarding body after each exam series. Boundaries shift every session based on how difficult the paper was judged to be, so there is no single universal percentage that guarantees any given grade.
Why do grade boundaries change every year?
Grade boundaries are not fixed targets. Cambridge International and Pearson Edexcel both use a statistical process called grade boundary setting, which happens after all scripts have been marked. Examiners review the overall difficulty of the paper, the cohort's performance, and historical data before confirming where each grade begins.
According to Cambridge International Education, boundaries are set to reflect the standard of achievement required, not to produce a predetermined distribution of results. A harder paper will have lower percentage thresholds. An easier one will require higher raw marks to reach the same grade.
This is why two students sitting different subjects can both score 72% and receive completely different grades. It is also why looking up last year's boundaries is useful for context but should never be treated as a guaranteed guide to this year's outcome.
How does the Cambridge A* to G grading scale work?
Cambridge IGCSE uses a letter grade scale from A* (highest) to G (lowest), with U (ungraded) below that. Most universities and schools treat C and above as a passing standard, though specific programmes may require B or A grades in core subjects.
Here is a general guide to how raw mark percentages have historically mapped to Cambridge letter grades. These figures are illustrative averages across subjects and sessions, not official Cambridge-published thresholds.
| Grade | Typical percentage range (approximate) | What it signals |
|---|---|---|
| A* | 90% and above (can be as low as 78% in hard papers) | Exceptional performance |
| A | 75%,89% (varies widely by subject) | Strong, consistent command |
| B | 60%,74% | Solid understanding with some gaps |
| C | 45%,59% | Core competency demonstrated |
| D | 35%,44% | Partial understanding |
| E | 25%,34% | Limited but present knowledge |
| F / G | Below 25% | Minimal evidence of subject knowledge |
These ranges are drawn from published Cambridge grade boundary reports across multiple series. In Mathematics, an A* has historically required around 80-90% of available marks. In English Language, the boundary has sometimes been set as low as 75% for an A* due to paper difficulty. Always check the specific subject and session boundary document on the Cambridge results support page.
How does Edexcel 9-1 grading differ from Cambridge A*-G?
Pearson Edexcel uses a numerical 9-1 scale for its International GCSE qualifications, which mirrors the reformed GCSE grading system used in England. The two scales are not a direct swap, but there are accepted equivalence points.
The table below shows the broadly accepted equivalences used by schools and universities when comparing the two systems.
| Edexcel grade | Cambridge equivalent (approximate) | Common interpretation |
|---|---|---|
| 9 | A* (top end) | Exceptional |
| 8 | A* (lower end) to A | Excellent |
| 7 | A | Strong |
| 6 | B (upper) | Above average |
| 5 | B / C (lower) | Solid pass |
| 4 | C | Standard pass |
| 3 | D | Below standard pass |
| 1-2 | E, F, G | Minimal attainment |
For Edexcel subjects, grade 4 is generally the minimum accepted by schools as a pass, and grade 5 is considered a strong pass. If your child is targeting A-Level study, most sixth forms and international schools require a 6 or 7 in relevant subjects.
How are IGCSE grades actually calculated?
The calculation process has several steps. Understanding each one helps you read mock results more accurately.
First, raw marks from each exam component are totalled. Components are then weighted according to the syllabus specification. Cambridge IGCSE Mathematics 0580, for example, weights Paper 2 and Paper 4 at 35% each, with the remaining 30% from coursework or an alternative paper depending on the school's entry option.
Once weighted totals are calculated across the cohort, the awarding body's grade boundary committee meets. They review statistical predictions, sample marked scripts, and the chief examiner's report on paper difficulty before setting each grade threshold. The final boundaries are published alongside results.
Our tutors regularly see students underestimate the impact of component weighting. A student who performs well on one paper but neglects another can lose far more marks than they realise, even when their overall percentage looks reasonable on a mock.
What do cambridge grade boundaries look like for 2026?
Cambridge publishes official grade boundaries after each exam series, typically within a few days of results release. The May/June 2026 series results are expected in August 2026. The October/November 2025 series boundaries will be available earlier for students who sat that window.
You can find published boundary documents directly on the Cambridge Results Support website, organised by syllabus code and series. Each document lists the minimum mark required for each grade on each component, plus the overall combined threshold.
For planning purposes, students preparing now should use the May/June 2024 and 2023 boundaries as reference points. These are the most recent published data and give a realistic picture of where thresholds have been sitting. Bear in mind that cambridge grade boundaries 2026 will not be available until after the series concludes.
How should you use mock exam results against these boundaries?
Mock results are most useful when mapped against the subject-specific boundaries from the most recent published series, not against a generic percentage-to-grade table. Here is a practical process.
- Download the latest boundary document for your subject and syllabus code.
- Identify which component your mock paper mirrors.
- Convert your raw mark to a percentage of that component's maximum.
- Compare against the published component boundary, not the overall grade boundary.
- Adjust your target by 3-5 marks to account for variation between sessions.
This method gives you a far more grounded sense of where you stand than a simple percentage-to-letter lookup. Students who begin IGCSE tutoring in Year 10 with this kind of boundary-aware approach tend to set more realistic targets and identify weak components before they become a problem in the real exam.
It is also worth noting that the percentage to letter grade IGCSE relationship varies significantly by subject. Mathematics and the sciences tend to have higher A* boundaries than humanities subjects, partly because papers are more structured and marking is less discretionary.
How Talimat can help
Talimat's tutors work with students across Cambridge IGCSE, Edexcel, AQA, and IB curricula, helping them understand not just the content but the marks behind the marks. Knowing where the boundaries sit, how components are weighted, and what examiners actually reward is a core part of what good IGCSE tutoring delivers.
Every student on the platform is matched with a subject-specialist tutor in under 10 minutes, supported by a dedicated Academic Consultant, and given access to mock exams with structured feedback. Whether you are revising Mathematics, navigating English Language coursework, or preparing for a November resit, online tutoring with Talimat is built around your specific syllabus and your specific gaps.
If you want to know exactly where your child stands against the 2026 grade boundaries and what it will take to close the gap, contact us and we will match them with the right tutor today.
Understanding grade boundaries is not just an admin exercise. It is one of the most direct ways to turn revision time into results.
Frequently Asked Questions
An IGCSE grade conversion chart maps raw marks or percentage scores to letter grades (A* to G) or numerical grades (9 to 1 for Edexcel). Use one by downloading the official grade boundary document for your specific subject and exam series, then comparing your raw mark against the published threshold for each grade.
Cambridge calculates IGCSE grades by totalling raw marks across each weighted component, then applying grade boundaries set after the exam series. Boundaries are determined by a committee reviewing paper difficulty, cohort performance, and historical data. The final threshold for each grade is published alongside results and varies by subject and series.
Neither system is consistently harder. Both Cambridge and Edexcel set boundaries based on paper difficulty each session. An Edexcel grade 9 broadly equates to a Cambridge A* at the top end, and a grade 4 equates to a C. The percentage required for each grade depends on the specific subject and how the paper performed across the cohort.
IGCSE tutoring costs in the UAE and Saudi Arabia vary depending on the platform, tutor experience, and session frequency. Talimat offers live 1:1 sessions with vetted, degree-qualified tutors. Pricing is positioned as a premium investment in results rather than a budget option. Contact Talimat directly for a personalised recommendation and session plan.
A C grade meets the minimum pass standard at Cambridge IGCSE, but most schools and sixth forms require B or above in subjects you plan to study at A-Level. Competitive programmes in science, mathematics, or languages typically ask for A or A* at IGCSE. Check your school's specific entry requirements well in advance of applying.
Yes. Cambridge IGCSE and Edexcel International GCSE qualifications are widely recognised by universities in the UK, US, Canada, and Australia as evidence of secondary achievement. US universities typically consider IGCSEs alongside SAT or AP scores. UK universities assess IGCSEs as part of the overall application, particularly for subject-specific entry requirements.
About the author
Talimat Academic Team
Education Specialist
The Talimat Academic Team are subject specialists and exam board experts with extensive experience supporting IGCSE, A-Level, and IB students across the Gulf.
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