Guide
How to calculate your CGPA.
The formula Nigerian universities and polytechnics use, the grade point tables, and a worked example you can check by hand.
1. Turn each grade into points
5.0 scale (most universities)
| Grade | Score | Point |
|---|---|---|
| A | 70–100 | 5 |
| B | 60–69 | 4 |
| C | 50–59 | 3 |
| D | 45–49 | 2 |
| E | 40–44 | 1 |
| F | 0–39 | 0 |
4.0 scale (polytechnics and some universities)
| Grade | Score | Point |
|---|---|---|
| A | 75–100 | 4 |
| B | 65–74 | 3 |
| C | 50–64 | 2 |
| D | 40–49 | 1 |
| F | 0–39 | 0 |
Schools sometimes use their own score ranges or extra grades (such as AB or BC). Check your student handbook; the calculator lets you set a custom scale.
2. Work out your GPA for a semester
For each course, multiply the units by the grade point. Then divide the total points by the total units.
| Course | Units | Grade | Point | Units × point |
|---|---|---|---|---|
| CSC 101 | 3 | A | 5 | 15 |
| MTH 101 | 3 | B | 4 | 12 |
| GST 101 | 2 | C | 3 | 6 |
| PHY 101 | 2 | F | 0 | 0 |
| Total | 10 | 33 |
GPA = 33 ÷ 10 = 3.30. The F still counts: its 2 units are in the total, which pulls the GPA down until you pass the course.
3. Work out your CGPA
Your CGPA uses the totals from every semester, not the average of your GPAs. Say next semester you earn 48 points from 12 units (a GPA of 4.00):
CGPA = (33 + 48) ÷ (10 + 12) = 81 ÷ 22 = 3.68. Averaging the two GPAs would give 3.65, which is wrong because the semesters have different units.
4. Find your class of degree
5.0 scale
| Class | CGPA |
|---|---|
| First Class | 4.50 – 5.00 |
| Second Class Upper (2:1) | 3.50 – 4.49 |
| Second Class Lower (2:2) | 2.40 – 3.49 |
| Third Class | 1.50 – 2.39 |
| Pass | 1.00 – 1.49 |
4.0 scale
| Class | CGPA |
|---|---|
| Distinction | 3.50 – 4.00 |
| Upper Credit | 3.00 – 3.49 |
| Lower Credit | 2.50 – 2.99 |
| Pass | 2.00 – 2.49 |
Common mistakes
- Averaging semester GPAs instead of using total points and total units.
- Leaving out failed courses or carry-overs. Follow your school’s rule for how a retaken course counts.
- Rounding too early. Keep full figures until the end, then round to two decimal places.
Your school’s published result is always the official one. Questions? See the FAQ.
Skip the maths.
Enter your grades and the calculator does all of this for you, every semester.