Chinese universities grade on a 100-point percentile scale (百分制), but graduate programs abroad require a GPA. The conversion is not standardized — an 85 translates to 3.7 under WES rules, 3.0 under the Standard 4.0 scale, and 3.58 under the Peking University formula. Enter each course's score and credit hours, and this calculator shows the weighted GPA under five commonly used algorithms, highlighting which one yields the highest result.
Why GPA Conversion Algorithms Differ
There is no single authority that maps Chinese percentile scores to a 4.0 GPA. American universities, credential evaluators like WES, and Chinese institutions each publish their own tables. The Standard 4.0 groups scores into four broad tiers, penalizing students whose averages cluster just below a boundary (e.g. 89 vs. 90). The PKU formula smooths this by using a continuous curve, but it compresses the middle range — an 80 becomes 2.75 instead of 3.0. WES provides finer tiers and is the de-facto standard for credential evaluation in North America. Choosing the right algorithm depends on which one the target institution accepts.
How the PKU Formula Works
The Peking University GPA formula is GPA = 4 − 3 × (100 − x)² / 1600, where x is the percentile score. It maps 100 to 4.0 and 60 to exactly 1.0. The curve is concave: scores above 85 convert generously (92 → 3.88), while scores in the 70–80 range map to 2.31–3.25. This makes the PKU algorithm favorable for students with mostly high scores, because the curve flattens near the top.
Which Algorithm Should You Use
- If your target program specifies WES evaluation, use the WES conversion — it is the table WES itself applies.
- If the program asks for your university's official GPA and your university uses a 4.3 or 5.0 scale, report that scale directly.
- If no system is specified, calculate under all algorithms and report the one that gives the highest GPA, with a footnote explaining the method.
- Some students submit both the PKU-formula GPA and the WES GPA in their application materials so the admissions committee can see the range.
Common Mistakes in GPA Conversion
The most frequent error is using unweighted averages: summing GPAs and dividing by course count ignores credit hours, which inflates the impact of low-credit electives. Another mistake is rounding percentile scores before conversion — an 89.5 should not be rounded to 90 and then mapped to 4.0 under the Standard scale. Always use the score exactly as it appears on the official transcript. Finally, mixing algorithms across semesters produces a meaningless aggregate; pick one method and apply it consistently to all courses.
FAQ
Q: How do I convert Chinese grades to a 4.0 GPA?
A: There is no single conversion. The most common method is the WES table: 90+ = 4.0, 85–89 = 3.7, 82–84 = 3.3, and so on. Other methods include the Peking University quadratic formula and the standard four-tier mapping. Use whichever algorithm your target institution specifies, or compare all five to find the most favorable result.
Q: Does WES accept Chinese university transcripts directly?
A: WES requires official transcripts verified through CDGDC (China Academic Degrees and Graduate Education Development Center) or CHESICC. The raw percentile scores on the transcript are then converted using WES's own tier table. This calculator uses that same tier table.
Q: Is 85 in China equal to a 3.7 GPA?
A: Under WES rules, yes — 85–89 maps to 3.7. But under the Standard 4.0 scale it is only 3.0, and under the PKU formula it is 3.58. The answer depends entirely on which conversion table is being used.