If you are a student in a Nigerian university, polytechnic, or college of education, it is essential to understand how to calculate your GPA and CGPA.
In Nigeria, your GPA (Grade Point Average) is calculated by multiplying the credit units of each course by the grade points earned, summing all the resulting quality points, and dividing by the total credit units.
Formula:
GPA = Total Quality Points ÷ Total Credit Units
Your CGPA (Cumulative GPA) is the average of all your semester GPAs. Add all semester GPAs together and divide by the number of semesters completed.
Formula:
CGPA = Sum of Semester GPAs ÷ Number of Semesters
Grade Points: A=5, B=4, C=3, D=2, E=1, F=0
Many students are unsure of how to calculate their GPA and CGPA, and some wait until the final year to check their CGPA, only to be surprised by the result.
Scholarjoiner explains everything in a simple way that you will understand. No confusing formula.
By the end of this tutorial, you will actually learn and master how to calculate your GPA and CGPA manually, and also understand how Nigerian schools grade students.
What Is GPA?
GPA (Grade Point Average) is the average of your grades for one semester.
In a simple term, GPA answers one specific question:
“How did I perform in this particular semester?”
GPA is calculated using:
Your course units
Your grades
Your school’s grading scale (usually 5.0 or 4.0)
Nigeria Grading Scale
Most Nigerian universities use the 5.0 grading system, while some private universities and colleges use 4.0.
Let’s first understand the Nigerian Grading system from the secondary school to the university level.
High schools or secondary schools follow a standardized scale, primarily from A to F.
Nigerian High School Grading Scale
| Nigeria Grades | English Terms | Percentage Score % | GPA |
|---|---|---|---|
| A1 | Excellent | 75% – 100% | 4.0 |
| B2 | Very Good | 70% – 74% | 3.6 |
| B3 | Good | 65% – 69% | 3.2 |
| C4 | Credit | 60% – 64% | 2.8 |
| C5 | Credit | 55% – 59% | 2.4 |
| C6 | Credit | 50% – 54% | 2.0 |
| D7 | Pass | 45% – 49% | 1.6 |
| E8 | Pass | 40% – 44% | 1.2 |
| F9 | Fail | 0% – 39% | 0.0 |
5.0 Grading System (Most Federal & State Universities)
| Nigeria Grades | English Terms | Percentage Score % | GPA |
|---|---|---|---|
| A | Excellent | 70% – 100% | 5.0 |
| B | Very Good | 60% – 69% | 4.0 |
| C | Good | 50% – 59% | 3.0 |
| D | Fair | 45% – 49% | 2.0 |
| E | Pass | 40% – 44% | 1.0 |
| F | Fail | 0% – 39% | 0.0 |
The Nigerian University uses a detailed grading scale that ranges from 5.0 to 0.0.
4.0 Grading System (Some Private Institutions)
| Score (%) | Grade | Grade Point |
|---|---|---|
| 70 – 100 | A | 4.0 |
| 60 – 69 | B | 3.0 |
| 50 – 59 | C | 2.0 |
| 45 – 49 | D | 1.0 |
| 0 – 44 | F | 0.0 |
Now that you’ve learn how the Nigerian grading system works, let’s calculate your GPA and CGPA.
How to Calculate GPA in Nigeria (Step-by-Step)
GPA = Total Quality Points (Semester)
÷ Total Units (Semester)
To calculate your GPA for a semester, follow these steps:
Step 1: List Your Courses and Units
Example:
| Course | Unit | Grade | Grade Point |
|---|---|---|---|
| MTH 101 | 3 | A | 5 |
| ENG 101 | 2 | B | 4 |
| PHY 101 | 3 | C | 3 |
| CHM 101 | 2 | B | 4 |
Step 2: Multiply Units by Grade Points
| Course | Unit | Grade Point | Unit × GP |
|---|---|---|---|
| MTH 101 | 3 | 5 | 15 |
| ENG 101 | 2 | 4 | 8 |
| PHY 101 | 3 | 3 | 9 |
| CHM 101 | 2 | 4 | 8 |
| Total Quality Points | 40 | ||
Step 3: Divide by Total Units
Total Units = 3 + 2 + 3 + 2 = 10
GPA = Total Quality Points ÷ Total Units
GPA = 40 ÷ 10 = 4.00
How to Calculate CGPA in Nigeria
CGPA is calculated using all your semesters.
CGPA = Total Quality Points (All Semesters)
÷ Total Units (All Semesters)
| Semester | Total Units | Total Quality Points |
| Year 1 – Sem 1 | 20 | 78 |
| Year 1 – Sem 2 | 22 | 84 |
| Year 2 – Sem 1 | 21 | 80 |
Example CGPA Calculation
Total Units = 63
Total Quality Points = 242
CGPA = 242 ÷ 63 = 3.84
CGPA Class of Degree in Nigeria (5.0 Scale
| CGPA | Class of Degree |
|---|---|
| 4.50 – 5.00 | First Class |
| 3.50 – 4.49 | Second Class Upper (2:1) |
| 2.40 – 3.49 | Second Class Lower (2:2) |
| 1.50 – 2.39 | Third Class |
| 1.00 – 1.49 | Pass |
| 0.00 – 0.99 | Fail |
Common Mistakes Students Make
- Ignoring course units
- Using wrong grading scale
- Forgetting failed courses (F counts as 0)
- Estimating instead of calculating
Even one mistake can change your class of degree.
Should You Calculate Manually or Use a Calculator?
Manual calculation helps you understand your result, but calculators:
- Save time
- Reduce errors
- Help with many semesters
👉 Use a CGPA Calculator made for Nigerian schools for accuracy.
University & Location-Specific CGPA Calculators
Some schools have unique grading rules.
Use a calculator made for your institution:
UNN CGPA Calculator
UNILAG GPA Calculator
UI CGPA Calculator
Lagos State GPA Calculator
Frequently Asked Questions: How to Calculate GPA and CGPA in Nigeria
GPA (Grade Point Average) is the average score you earn in a single semester, while CGPA (Cumulative Grade Point Average) is the average of all your GPAs over multiple semesters.
To calculate your GPA:
- Multiply the credit units of each course by the grade point you earned.
- Add all the “quality points” together.
- Divide the total quality points by the total credit units.
Formula: GPA = Total Quality Points ÷ Total Credit Units
To calculate CGPA:
- Add the GPA of all semesters.
- Divide by the number of semesters completed.
Formula: CGPA = Sum of Semester GPAs ÷ Number of Semesters
In Nigerian universities, typical grade point conversion is:
- A = 5 points
- B = 4 points
- C = 3 points
- D = 2 points
- E = 1 point
- F = 0 point
Typical Nigerian CGPA classification:
- 4.50 – 5.00 → First Class
- 3.50 – 4.49 → Second Class Upper (2:1)
- 2.40 – 3.49 → Second Class Lower (2:2)
- 1.50 – 2.39 → Third Class
- 1.00 – 1.49 → Pass
- 0.00 – 0.99 → Fail
Your GPA and CGPA are not just numbers, they can affect your future opportunities, scholarships, and employment. You must understand how it works if you really want to control your academic journey.
Use our Nigerian CGPA calculator designed for your school to get instant results without stress.
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