Portuguese universities grade coursework and exams on a 0-to-20 point scale, where 10 is the minimum passing grade (set by national law, Decree-Law 42/2005) and 18–20 is generally reserved for exceptional, near-perfect work.
How the Portuguese 0–20 scale works
Every course grade at a Portuguese university — written exams, oral defenses, project work — is reported as a whole number (occasionally with one decimal) from 0 to 20. The scale is used consistently across public and private universities and polytechnics nationwide, and it's commonly grouped into a few widely used descriptive bands:
| Numeric range | Portuguese term | General interpretation |
|---|---|---|
| 18 – 20 | Excelente | Excellent, exceptional performance |
| 16 – 17 | Muito Bom | Very good |
| 14 – 15 | Bom | Good |
| 12 – 13 | Suficiente Bom / Satisfatório | Satisfactory |
| 10 – 11 | Suficiente | Sufficient (minimum pass) |
| 0 – 9 | Reprovado | Fail |
These descriptive labels (Excelente, Muito Bom, Bom, Suficiente, Reprovado) are widely used across Portuguese institutions and appear on many Erasmus/ECTS equivalence documents, but they are a common convention rather than a single legally standardized labeling — some universities apply slightly different band boundaries, especially in the 12–17 middle range. Always check your specific institution's published scale.
Why grades above 18 are uncommon
Portuguese university grading has a reputation for being relatively conservative, similar to several other Southern European systems. A 20 out of 20 is technically possible but genuinely rare in practice, and many professors reserve the very top of the scale for work that goes meaningfully beyond course expectations — which is part of why a 15 or 16 is a strong, respectable result rather than a middling one.
ECTS grades alongside the national scale
Because Portugal participates in the European Credit Transfer System, transcripts from Portuguese universities typically show both the national 0–20 grade and a separate ECTS letter grade (A through F) for international mobility purposes. Unlike the national scale, the ECTS letter is assigned statistically — based on where a student's grade falls relative to other students who passed the same course over the prior several academic years — rather than from a fixed numeric cutoff. This means the ECTS letter and the national 0–20 grade are two different labels answering two different questions, and one shouldn't be mistaken for a simple relabeling of the other.
Converting a Portuguese grade to a US 4.0 GPA
There is no single official Portugal-to-US GPA conversion formula, and different sources diverge noticeably in the 13–17 middle range. A commonly referenced general mapping looks like this:
| Portuguese grade (0–20) | Approx. US letter | Approx. GPA points |
|---|---|---|
| 18 – 20 | A | 4.0 |
| 16 – 17 | A- / B+ | 3.3 – 3.7 |
| 14 – 15 | B | 3.0 |
| 12 – 13 | C+ | 2.3 |
| 10 – 11 | C / D | 1.0 – 2.0 |
| 0 – 9 | F | 0.0 |
Worked example: A student's transcript from a Portuguese university lists the following course results:
| Course | Credit hours (ECTS) | Portuguese grade | Approx. GPA points |
|---|---|---|---|
| Cálculo I | 6 | 15 | 3.0 |
| Direito Comercial | 6 | 17 | 3.7 |
| Economia | 5 | 13 | 2.3 |
| Estatística | 6 | 11 | 1.5 |
Weighted GPA = ((3.0×6) + (3.7×6) + (2.3×5) + (1.5×6)) ÷ 23 = (18.0 + 22.2 + 11.5 + 9.0) ÷ 23 = 60.7 ÷ 23 ≈ 2.64
Once each course grade is mapped to an estimated GPA value, a GPA Calculator can handle the credit-weighted arithmetic automatically.
If you're submitting a Portuguese transcript for a US graduate program, scholarship, or job application, check whether the receiving institution or a credential evaluator like WES has a published Portugal-specific conversion table before relying on a generic self-calculated GPA — this matters most in the 13–17 range, where conversion tables tend to disagree most.
Common points of confusion
- National grade vs. ECTS letter: A transcript showing both a "16" and a "B" is reporting two separate things — the national 0–20 grade and a statistically-derived ECTS letter — not the same grade expressed two ways.
- Decimal grades: Some courses, especially at the graduate level, report grades to one decimal place (like 15.4), while others round to a whole number before recording it on the transcript.
- University vs. secondary school grading: Portuguese secondary schools also use a 0–20 scale, but the descriptive bands and grading conventions used at the university level don't always map onto secondary-school grading in exactly the same way.
How Portugal compares to other European systems
Portugal's 0–20 scale is shared by France's grading system, though the two countries apply different passing thresholds and grading conventions in practice. For a broader side-by-side view of how European and international grading systems compare, see our international grading systems comparison.
Key takeaways
- Portuguese universities grade on a 0–20 scale, with 10 as the national legal minimum pass and 18–20 reserved for exceptional work.
- Descriptive bands (Excelente, Muito Bom, Bom, Suficiente, Reprovado) are a widely used convention, but exact boundaries can vary slightly between institutions, particularly in the 12–17 range.
- Portuguese transcripts often show both the national 0–20 grade and a separately calculated, statistically-derived ECTS letter grade — the two aren't interchangeable.
- No single official Portugal-to-US GPA conversion exists; treat conversion tables as estimates and confirm with your target institution or evaluator when it matters.
