By: Ogunleye Kolapo
GPA and CGPA confuse a lot of students. Some don’t know the difference, while others understand the terms but struggle with the actual calculation.
A few days ago on Facebook, a 400-level student asked whether they could still graduate with a First Class after entering final year with a 4.20/5.00 CGPA, if they scored a perfect GPA in their last session. The answer is simply a big NO. This is not because the student is not capable, but because by final year, most of the credit units that decide your class of degree are already locked in. Even a perfect final semester usually can’t pull a 4.20 CGPA into First Class range.
With second semester underway, this is a good time to understand where you stand. This explainer breaks down what GPA and CGPA mean, how to calculate both, and what your numbers say about the class of degree you’re aiming for.
What Are GPA and CGPA?
Before learning how to calculate your GPA or CGPA, it’s important to understand what each term means. Although they are often used interchangeably, they are not the same thing.
GPA (Grade Point Average) measures your performance in one semester. While CGPA (Cumulative Grade Point Average) measures your performance across every semester you’ve completed.
Using a football season as an example. Your GPA is how you played in one match. While your CGPA is your form across the whole season. A high GPA means you did well this semester. A high CGPA means you’ve stayed strong over several.
The Building Blocks
Before we start calculating GPA or CGPA, let’s get familiar with a few terms you’ll come across repeatedly. Once you understand these five terms, calculating your GPA or CGPA becomes much easier.
- Course: A subject you register for (e.g. GST 101, POS 211).
- Course Unit: How much weight a course carries. A 4-unit course affects your GPA more than a 2-unit course.
- Grade: The letter you’re awarded (A, B, C, D, E, F) based on your score.
- Grade Point: The number attached to each grade.
- Quality Point (QP): Course Unit × Grade Point. This is what actually goes into your GPA calculation.
The Two Grading Systems
At the University of Ibadan, there are two active grading systems. 100 and 200 Level students use the 5-point system. This system is the new grading system for the university. 300 Level and above use the 4-point system. The 4 point grading system is being phased out. The calculation method is identical either way, only the maximum grade point changes.
5-Point System
| Grade | Score | Point |
|---|---|---|
| A | 70-100 | 5.0 |
| B | 60-69 | 4.0 |
| C | 50-59 | 3.0 |
| D | 45-49 | 2.0 |
| E | 40-44 | 1.0 |
| F | 0-39 | 0.0 |
4-Point System
| Grade | Score | Point |
|---|---|---|
| A | 70-100 | 4.0 |
| B | 60-69 | 3.0 |
| C | 50-59 | 2.0 |
| D | 45-49 | 1.0 |
| F | 0-44 | 0.0 |
How to Calculate GPA
Now that you understand the basic terms and grading systems, calculating your GPA becomes much easier. The first step is to calculate the Quality Point (QP) for each course using the formula below.
Formula: GPA = Total Quality Points ÷ Total Course Units
Example, a student’s semester:
| Course | Units | Grade | Point | QP |
|---|---|---|---|---|
| GST 101 | 2 | A | 5 | 10 |
| POS 211 | 3 | B | 4 | 12 |
| SOC 201 | 2 | C | 3 | 6 |
| GES 103 | 2 | A | 5 | 10 |
| PHI 201 | 3 | B | 4 | 12 |
| Total | 12 | 50 |
GPA = 50 ÷ 12 = 4.17
Common mistake: Don’t average the grade points directly (5+4+3+5+4 ÷ 5). That ignores course units. Always calculate QP per course first, then divide the totals.
How to Calculate CGPA
Calculating your CGPA is very similar to calculating your GPA. The difference is that while GPA measures your performance in one semester, CGPA measures your performance across all the semesters you have completed. To calculate your CGPA, use this formula
CGPA = Total Cumulative Quality Points ÷ Total Cumulative Course Units
| Semester | Units | Quality Points |
|---|---|---|
| First | 20 | 84 |
| Second | 18 | 68.4 |
| Third | 22 | 99 |
| Total | 60 | 251.4 |
CGPA = 251.4 ÷ 60 = 4.19
Common mistake: Averaging the semester GPAs directly (4.20 + 3.80 + 4.50 ÷ 3 = 4.17) gives a close but wrong answer, since semesters carry different units. Always work from the cumulative totals.
Can You Still Graduate with a First Class?
It depends on your current CGPA and how many semesters and units you have left. A 3.80 CGPA after first year still leaves plenty of room to climb to First Class. A 4.00 CGPA entering final year does not, because most of the units that decide your final class are already used up.
Your CGPA works like filling a bucket. Early on, every cup of water makes a visible difference. As it fills, each new cup matters less. Every semester still counts, but the earlier ones move the needle more.
Setting a GPA Target
Your target for this semester depends on three things: your current CGPA, how many semesters remain, and the units you’ve completed versus what’s left. Knowing the answers to these questions helps you set realistic academic goals and track your progress throughout the semester. If your calculations show that you need a GPA of 4.20, don’t settle for 4.20. Aim higher. Setting a higher target gives you a better chance of achieving, or even surpassing, the GPA you actually need. Remember, every semester contributes to your final result. The earlier you begin improving your performance, the greater the impact on your CGPA. .
Conclusion
Understanding your GPA and CGPA goes beyond simply calculating numbers. It is about knowing where you stand academically, setting realistic goals, and making informed decisions throughout your university journey.
This is like going to the market. Before making a purchase, you first check how much money you have. Your budget determines what you can realistically afford. In the same way, your CGPA tells you where you stand academically and what you can realistically achieve by graduation.
Whether you’re aiming for a First Class, hoping to move into a higher class of degree, or simply determined to improve on your previous semester, the first step is knowing your numbers. Once you understand how GPA and CGPA are calculated, you can stop relying on guesswork and start making informed academic decisions.
