How to Calculate Your CGPA on a 4-Point and 5-Point Scale

Your Cumulative Grade Point Average (CGPA) is one of the most important numbers in your academic career. It affects your class of degree, scholarship eligibility, postgraduate admission, and even some job applications. Yet many Nigerian university students are not entirely sure how it is calculated. This guide breaks it down clearly, with examples for both the 4-point and 5-point grading scales.

Understanding Grade Points and Credit Units

Every course you take has two key values attached to it: a grade (usually a letter like A, B, C) and a credit unit (also called a credit hour), which reflects how many hours per week the course is taught. Your grade is converted to a grade point based on your university's scale. On a 4-point scale, an A is typically worth 4 points; on a 5-point scale, an A is worth 5 points. The specific cutoffs vary by institution, so always check your student handbook.

The CGPA Formula

For any given semester, your GPA is calculated as follows: multiply the grade point you earned in each course by the credit units for that course to get the "quality points." Add up all quality points, then divide by the total credit units taken. For example, on a 5-point scale: if you scored A (5 points) in a 3-unit course, B (4 points) in a 2-unit course, and C (3 points) in a 3-unit course, your quality points are (5×3) + (4×2) + (3×3) = 15 + 8 + 9 = 32. Your total credit units are 3 + 2 + 3 = 8. Your semester GPA is 32 ÷ 8 = 4.00.

Your CGPA is simply this same calculation applied across all semesters combined: total cumulative quality points divided by total cumulative credit units. Use our free CGPA calculator to compute yours instantly without doing the arithmetic manually.

Class of Degree Thresholds

On a 5-point scale, First Class typically requires a CGPA of 4.50 and above; Second Class Upper (2:1) falls between 3.50 and 4.49; Second Class Lower (2:2) between 2.40 and 3.49; Third Class between 1.50 and 2.39; and Pass below 1.50. On a 4-point scale, First Class is usually 3.60 and above. These thresholds vary between institutions, so confirm your school's specific policy. Browse your university's academic resources on myBenkio for institution-specific grading guides.

How to Improve a Low CGPA

Because your CGPA is a weighted average of all your semesters, improving it requires sustained performance over time. A single great semester has less impact than you might hope, especially in later years when many credit units have already accumulated. Focus on high-credit-unit courses first, since they affect your CGPA the most. Seek carryover clearance or supplementary exams for failed courses as soon as possible, because an F sitting in your record drags your average down with every calculation. Consistent, incremental improvement across multiple semesters is the most reliable path upward.