How GPA Is Calculated: 4.0, 4.3, and Percentages

Two of the most frequently asked GPA questions by international students:

"What's my current GPA?"
"How many points do I need to score in the Final to maintain a 3.7 GPA for graduate school applications?"

Neither of these questions is complicated, but the prerequisite is that you have to understand which GPA rule your school uses. This article explains all kinds of GPA systems and calculation formulas in the most straightforward way.

I. What is GPA

GPA = Grade Point Average, which is the average grade point. In essence, it converts the "letter / percentage grades" of each course into numerical values and then calculates the weighted average based on the credits:

$$ \text{GPA} = \frac{\sum (\text{Grade Point}_i \times \text{Credits}_i)}{\sum \text{Credits}_i} $$

Here is an example:

Course	Grade	Credits	Grade Point (on a 4.0 scale)	Weighted Score
CS101	A	4	4.0	16.0
MATH201	B+	3	3.3	9.9
ENG100	A-	3	3.7	11.1
HIST110	B	3	3.0	9.0
Total		13		46.0

$$ \text{GPA} = 46.0 \div 13 = 3.54 $$

II. 4.0 Scale vs 4.3 Scale (The Two Most Common Ones)

The vast majority of American universities use the 4.0 scale, while some schools (such as Columbia University and the engineering department at UCLA) use the 4.3 scale — The biggest difference between the two lies in how to convert an "A+":

Letter Grade	4.0 Scale	4.3 Scale
A+	4.0	4.3
A	4.0	4.0
A-	3.7	3.7
B+	3.3	3.3
B	3.0	3.0
B-	2.7	2.7
C+	2.3	2.3
C	2.0	2.0
C-	1.7	1.7
D+	1.3	1.3
D	1.0	1.0
F	0.0	0.0

Key difference: On the 4.0 scale, an A+ is the same as an A, so getting an A+ won't improve your GPA; On the 4.3 scale, an A+ is 4.3, which may make your cumulative GPA exceed 4.0 (commonly known as "cheating").

III. Conversion of Percentage Grades in the UK, Australia, and Hong Kong Universities

The following common conversion table can be used as a reference for the percentage grades in UK undergraduate degrees (First Class, 2:1, 2:2, Third) and Australia (There are slight differences among different schools, so please refer to the official regulations):

Grade (UK)	Score Range	Approximate US GPA
First Class	70–100	≈ 3.7–4.0
Upper Second (2:1)	60–69	≈ 3.3–3.6
Lower Second (2:2)	50–59	≈ 2.7–3.2
Third Class	40–49	≈ 2.0–2.6
Fail	< 40	0

There are multiple conversion methods for converting the percentage grades in China / Hong Kong universities to the 4.0 scale, and the most common one is as follows:

Score Range	4.0 Scale GPA
90–100	4.0
85–89	3.7
82–84	3.3
78–81	3.0
75–77	2.7
72–74	2.3
68–71	2.0
60–67	1.0–1.7
< 60	0

When applying for graduate school, only the GPA on the official transcript of your school is recognized — Don't use the results from third - party calculators as application materials.

IV. Weighted GPA vs Unweighted GPA

Type	Meaning
Unweighted GPA	Each course has equal weight, commonly used in high school.
Weighted GPA	Weighted by credits (e.g., CS101 = 4 credits, HIST = 3 credits as mentioned above).
AP / Honors Weighted	In American high schools, the full score for AP courses is 5.0, while that for regular courses is 4.0.

When international students apply for graduate school / internships, the weighted GPA is usually shown on the official school transcript.

V. The Most Practical Question: How Many Points Do I Still Need to Score to Maintain the Target GPA?

Suppose your target GPA is 3.7 (on a 4.0 scale), and the current situation is as follows:

You have completed 8 courses, with a cumulative weighted score of 28.0 and cumulative credits of 24.
There is still 1 course with 4 credits left this semester, and the final grade is X.

Find the minimum value of X:

$$ \frac{28.0 + X \times 4}{24 + 4} \geq 3.7 \Rightarrow X \geq \frac{3.7 \times 28 - 28.0}{4} = 18.9 / 4 ≈ 3.45 $$

That is, you need to score ≥ 3.45 (converted back to a letter grade, it's approximately B+ ) in the last course to maintain a GPA of 3.7. This kind of "reverse - calculation of the target score" is very annoying to calculate by hand, but it takes less than 50ms to run this formula in the product.

The GPA calculation page of GPAce supports: entering the scores of completed tasks → entering the target GPA / total score → instantly reverse - calculating "how many points you need to score on average for the remaining tasks" and marking the risk of failing in red.

VI. Common GPA Myths

❌ "I'll be fine if I score over 80 in each course" — Wrong. If your school's 4.0 scale requires ≥ 90 to be an A, a score of 80 is only a B (3.0).
❌ "P / F courses don't affect GPA" — Not necessarily. Some schools count a Pass as 4.0.
❌ "Retaking a course can wipe out the previous grade" — In most schools, both the original grade and the retaken grade will appear on the transcript, and only the higher GPA is taken; admissions officers will see both grades when you apply for graduate school.
❌ "Withdraw (W) = no impact" — It doesn't affect GPA, but multiple Ws will be regarded as a problem of resilience by admissions officers.

Summary: Manage Your GPA in 3 Steps

At the beginning of the semester: Figure out the grading system (4.0 / 4.3 / percentage) for each course and enter it into GPAce.
In the middle of the semester: As soon as you get the scores of each quiz / assignment, enter them immediately to see the real - time changes in your GPA.
Before the final exams: Use the "reverse - calculation of the target score" function to figure out the minimum requirements for the Final and review purposefully.

GPA won't increase because of anxiety, but it will improve with the right methods.