Singapore's two largest universities, NUS and NTU, calculate a Cumulative Average Point (CAP) — now simply called GPA at NUS — on a 5.0-point scale rather than the standard US 4.0 scale, meaning a 4.0 CAP represents a solid B+-range result, not a perfect score, and needs to be rescaled before it can be compared to a US GPA.
Why Singapore's grading scale trips people up
The confusion around Singapore grades almost always comes down to one thing: the number "4.0" means two very different things depending on which scale it's reported on. On the standard US scale, 4.0 is the ceiling — a perfect grade point average. On the 5.0-point scale used by NUS and NTU, 4.0 sits comfortably in the middle-upper range, closer to a strong B+ average. Anyone comparing Singapore and US transcripts at face value, without checking which scale is in use, risks badly misjudging a student's actual academic standing in either direction.
Not every Singapore institution uses the 5.0 scale, either — Singapore Management University (SMU) and a number of the polytechnics use a standard 4.0-point scale, which adds another layer of "check the scale first" caution.
The 5.0-point CAP/GPA scale (NUS and NTU)
Based on the grading scale published by the NUS Registrar, the current letter-grade-to-point mapping looks like this:
| Letter Grade | Grade Points (5.0 scale) |
|---|---|
| A+ / A | 5.0 |
| A- | 4.5 |
| B+ | 4.0 |
| B | 3.5 |
| B- | 3.0 |
| C+ | 2.5 |
| C | 2.0 |
| D+ | 1.5 |
| D | 1.0 |
| F | 0.0 |
Notice that A+ and A share the same 5.0 grade point value on this scale — there's no extra premium for A+ the way some US institutions award above a 4.0. The distinction between A+ and A may still matter for honours classification, even though it doesn't change the CAP calculation.
How CAP is calculated
The formula is the same underlying idea as a standard US weighted GPA, just built on the 5.0-point table above:
CAP (GPA) = Σ(Grade Points × Course Credits/AUs) ÷ Σ(Course Credits/AUs)
At NUS and NTU, course weight is typically measured in "Modular Credits" or "Academic Units" (AUs) rather than the "credit hours" language used in the US, but the arithmetic works identically.
Worked example: converting a semester's grades
Consider a student's semester at a Singapore university using the 5.0-point scale:
| Module | Credits (MCs/AUs) | Grade | GPA Points | Quality Points |
|---|---|---|---|---|
| Data Structures | 4 | A- | 4.5 | 18.0 |
| Microeconomics | 4 | B+ | 4.0 | 16.0 |
| Statistics | 4 | A | 5.0 | 20.0 |
| Communication Skills | 2 | B | 3.5 | 7.0 |
Total credits: 4 + 4 + 4 + 2 = 14
Total quality points: 18.0 + 16.0 + 20.0 + 7.0 = 61.0
CAP = 61.0 ÷ 14 = 4.36 (on the 5.0 scale)
Converting a 5.0 CAP to a US 4.0 GPA
There is no single official conversion formula, but a commonly used rough approximation scales the CAP proportionally:
Estimated US GPA ≈ CAP ÷ 1.25
Applying that to the worked example above: 4.36 ÷ 1.25 ≈ 3.49 on an estimated US 4.0 scale.
This proportional method is a reasonable starting estimate, but it assumes the two grading distributions are directly comparable, which they may not be — Singapore universities, like many competitive institutions, are sometimes described as grading more conservatively at the very top of the scale than typical US grade distributions. For anything application-critical, use an official credential evaluation rather than this estimate alone.
Common pitfalls
- Assuming every Singapore university uses the same scale. NUS and NTU use 5.0; SMU and several polytechnics use 4.0 — always confirm before comparing.
- Reading a 4.0 CAP as a perfect score. On the 5.0 scale, it's a good result, not the ceiling — this single misunderstanding causes more confusion than any other part of the Singapore system.
- Skipping an official evaluation for formal applications. The ÷1.25 estimate above is useful for personal planning, but graduate schools and scholarship committees generally expect a proper credential evaluation, not a self-calculated approximation.
Once you know your module grades and credit weightings, our GPA Calculator and CGPA Calculator can help you total up your CAP on either the 4.0 or 5.0 scale — just double-check which point table your specific university uses before entering your grades.
