IGCSE & A-Level GPA Converter Cambridge Grades to an Indicative US 4.0 GPA

What these qualifications actually are

The Cambridge family of qualifications covers the last four years of secondary school and is used in more than a hundred and sixty countries. The International General Certificate of Secondary Education, or IGCSE, is usually taken at the end of Grade 10 or Year 11 and marks the completion of the broad secondary curriculum. The Advanced Subsidiary level, or AS-Level, is a one-year qualification typically taken in Grade 11 or Year 12. The full Advanced Level, or A-Level, is a two-year qualification that sits at the end of secondary school and is the standard university entrance qualification in England, Wales, and a large number of international schools worldwide.

The same three qualifications are offered by Edexcel and Oxford AQA, alongside Cambridge. All three awarding bodies use the same letter grade scale, so the conversion mapping on this page applies to all of them. The choice between awarding bodies is mostly about which subjects and specifications are available and which the school has chosen to teach; it is not about which one is harder in any absolute sense.

What matters for a US GPA conversion is not the awarding body but the level of the qualification and the letter grade awarded. An A-Level grade A from Cambridge, Edexcel, and Oxford AQA carries the same information to a US admissions office, and the same is true of a B or a C. The tool therefore does not ask which awarding body issued the grade.

How the Cambridge letter grade scale works

Cambridge and the other international awarding bodies use a seven-point letter scale for both IGCSE and A-Level. From the top down, the letters are A*, A, B, C, D, E, and U. An A* is a distinction grade that requires a very high examination performance, usually around ninety per cent or above. Grades A through E are passing grades, and U stands for ungraded, which means the examination was not passed.

The grade boundaries are not fixed percentages but are set each year after the examinations are marked. Cambridge uses a statistical process that looks at the difficulty of the paper and the performance of the cohort, then sets the minimum mark for each grade accordingly. This is why the same raw score can produce different letter grades in different years. It is also why the letter grade matters more than the percentage for university admissions purposes.

For AS-Level the scale is the same, but there is no A* grade in most subjects. AS-Level results run from A down to E, with U below that. Some AS-Level subjects do award an A* to very strong candidates, but this is not universal. The tool treats AS-Level A as equivalent to a 4.0 grade point, without any rigor weighting, because AS-Levels are one-year courses and do not carry the same academic depth as a full A-Level.

The mapping from grades to grade points

The standard mapping that most North American admissions and credential evaluation services use for international letter grades is as follows. Grade A* and grade A both map to 4.00 grade points on the unweighted scale. Grade B maps to 3.00. Grade C maps to 2.00. Grade D maps to 1.00. Grade E, which is a conditional pass, maps to 0.50. Grade U, which is a fail, maps to 0.00.

This mapping treats A* and A identically because the unweighted four-point scale does not have room to distinguish them. Some institutions use a plus and minus system that stretches the scale to twelve points, with A+ at 4.3 and A at 4.0, and in those systems the A* is sometimes given its own value. But the standard four-point scale that most international evaluations reference treats them as the same grade point.

The base points come from the letter grade mapping above. The plus 0.5 is added only if the subject is a full A-Level, not if it is an AS-Level or an IGCSE. This is the weighting that most US high schools already apply to Advanced Placement and International Baccalaureate Higher Level courses, and it is the reason the average of several A-Level grades can rise above 4.0.

Why A-Levels get a rigor weighting

The thinking behind rigor weighting is that a grade point average should reflect not only how well you did but also what you attempted. Two students with a 3.5 average on an unweighted scale look identical on paper, but one may have achieved that average in a mix of standard courses and the other in a set of the most demanding courses the school offers. Weighting the harder courses lets the second student's effort show up in the number.

A-Levels sit in the same category as Advanced Placement courses in the United States and International Baccalaureate Higher Level courses anywhere in the world. They involve roughly three hundred and sixty guided learning hours, are assessed by extended external examinations rather than by coursework alone, and require a level of independent study and analytical writing that goes well beyond the standard high school curriculum. Because of that, most US universities that evaluate international transcripts give A-Levels the same weighting treatment they give AP and IB courses.

The exact weighting varies by institution. Some add 0.5 as this tool does, some add 1.0, and a smaller number do not weight at all. Because there is no single national standard, this calculator uses the more conservative figure of 0.5. If a receiving institution uses a different convention, that convention takes priority, and the number from this tool should be adjusted accordingly.

How the calculator works, step by step

The calculation has three stages, and all three happen in your browser without anything being sent anywhere.

Stage one: convert each grade to base points. Each row you enter has a letter grade and a level. The letter grade is looked up in the mapping table, and the corresponding base points are assigned. A grade B is 3.00 points, a grade C is 2.00 points, and so on.

Stage two: apply the A-Level weighting. If the level for that row is A-Level, the plus 0.5 rigor bonus is added to the base points. An A-Level B therefore becomes 3.50 points, an A-Level A becomes 4.50, and so on. Rows marked IGCSE or AS-Level do not receive the weighting.

Stage three: divide by the number of subjects. The total of all the weighted grade points is divided by the total number of subjects entered. The result is the indicative weighted GPA that appears on the results panel. Alongside it the tool shows the unweighted comparison, which is the same calculation run without the plus 0.5 addition, so you can see how much the rigor weighting lifted the figure.

The panel at the bottom of the results section shows every subject with its base points, its weighting, and its contribution, so you can trace the number back to the individual grades and see exactly where it came from.

A worked example across three A-Levels

Take a student who has completed three full A-Levels. They scored an A* in Mathematics, an A in Physics, and a B in Chemistry. All three subjects were taken at A-Level, so all three get the plus 0.5 rigor weighting.

Mathematics: A* is 4.00 base points, plus 0.5 rigor weighting, which is 4.50 quality points. Physics: A is 4.00 base points, plus 0.5, which is 4.50 quality points. Chemistry: B is 3.00 base points, plus 0.5, which is 3.50 quality points. The total of the three weighted grade points is 4.50 plus 4.50 plus 3.50, which is 12.50. Divided by three subjects, the indicative weighted GPA is 4.17.

Now run the same grades through the unweighted version. Mathematics is 4.00, Physics is 4.00, Chemistry is 3.00. The total is 11.00, and divided by three that is 3.67. The difference between the two results is 0.50 points, which is exactly what the three A-Level rigor bonuses contribute on average. The weighted figure of 4.17 sits above the standard four-point ceiling because the rigor weighting pushes it there, and that is precisely the point of the weighting in the first place.

This is the profile that most top-tier North American universities would consider strong for direct admission, and in many cases the student would also be awarded university credit for the A-Level subjects passed at grade C or above. The exact amount of credit varies by institution, but three to eight semester credits per subject is a common range.

What US universities actually ask for

Most US universities with a dedicated international admissions office do not expect you to self-convert your grades. They ask for the original Cambridge certificates or a certified translation, and their own credential evaluation team runs the conversion internally using the institution's own rubric. The Common Application, which is used by more than nine hundred US universities, specifically asks international applicants to report their grades as they appear on their official certificates, not as a converted GPA.

There are two exceptions worth knowing. The first is the small number of universities that request a GPA on the application form itself. In those cases, the tool on this page gives you a defensible number to enter, and you should note in the additional information section that the GPA is a self-converted estimate from Cambridge letter grades. The second is US scholarship programmes, some of which do ask for a self-reported GPA and do not run their own evaluations. For those, the number from this tool is a reasonable planning figure.

For everything else, submit the original transcripts and let the institution do the work. This is not a sign that the self-converted number is wrong. It is a sign that credential evaluation is a specialised field, and institutions prefer to keep the process under their own control so that the numbers they publish are comparable across all applicants from all systems.

Common mistakes with self-conversion

Several mistakes come up repeatedly when students try to convert their own Cambridge grades, and each is easy to avoid.

Reporting the weighted GPA when an unweighted figure was requested. A weighted 4.17 and an unweighted 3.67 describe the same academic record but mean different things. If the application says unweighted, do not send the weighted figure, and vice versa.

Weighting every subject. Only A-Levels receive the rigor weighting on this page. AS-Levels and IGCSEs do not, and neither do the equivalent subsidiary qualifications. Adding the weighting to AS-Levels inflates the number without justification.

Leaving out weaker grades. Some students convert only the grades they are proud of and skip the rest. This produces a number that does not reflect the actual record, and it tends to backfire when the institution receives the full transcript and sees the discrepancy.

Treating the number as if it were a formal credential. A self-converted GPA is a planning estimate, not an official document. Universities, scholarship bodies, and employers who need an official US GPA require an evaluation from an accredited service, and no online calculator can stand in for that.

Comparing directly with a US student's unweighted GPA. A US student's unweighted 3.5 and a Cambridge student's unweighted 3.5 come from very different grading environments. The number is comparable in a rough sense but not in a precise one. Admissions offices know this and read international transcripts in context rather than at face value.

Forgetting predicted grades. If you are applying before your final examinations, your school will submit predicted grades rather than awarded ones. These are usually on the same letter scale, and the tool can convert them the same way, but you should make clear on the application that the grades are predicted rather than awarded.

Assuming the A* automatically gives extra credit. It does not, on this tool. A* and A both map to 4.00 base points. The only reason an A-Level A* ends up higher than an A-Level A in the final GPA is the rigor weighting on the A-Level, not a bonus for the star itself.

Where this tool stops

This calculator produces an indicative GPA from a set of Cambridge letter grades, using a mapping that reflects common North American practice. It does not know your school, your curriculum, the difficulty of the specific papers you sat, or the institution you are applying to, and it does not try to guess any of them.

It also does not produce a formal GPA in the sense that an accredited credential evaluation service does. WES, ECE, and the other major evaluators run course-by-course reviews that look at the syllabus, the guided learning hours, the type of assessment, and the institution that delivered the qualification. The number that comes out of that process is the one universities and employers treat as official. What this tool offers is a close planning estimate, useful for gauging where you sit and for reporting to applications that specifically ask for a self-converted figure.

Finally, it does not predict admissions outcomes. A GPA is one part of an application, and international admissions offices look at the full picture: test scores if submitted, personal statements, essays, recommendation letters, extracurricular activity, and the broader context of the school and the curriculum. The number from this page is a useful thing to know before you apply. It is not a verdict on your application.

Sources

The grade mapping and rigor weighting on this page follow the standards published by the Cambridge awarding bodies and the conventions used by North American credential evaluators. The sources below are the ones that carry the most weight for this subject and that a reader can verify independently.