GPA / CGPA Calculator

What Is GPA?

GPA (Grade Point Average) is a standardized way of measuring academic performance. Each letter grade corresponds to a numeric value on a scale, and the GPA is calculated by averaging these values, weighted by credit hours. CGPA (Cumulative Grade Point Average) extends this across all semesters. The most common scale worldwide is the US 4.0 scale, where A = 4.0 and F = 0.0, though many countries use their own systems.

The US 4.0 Scale

In the standard US 4.0 system, grades map as follows: A = 4.0 (excellent), B = 3.0 (good), C = 2.0 (average), D = 1.0 (below average), F = 0.0 (failing). Many schools use plus/minus grades for finer granularity: A- = 3.7, B+ = 3.3, etc. Some schools include A+ = 4.3, though many cap at 4.0. Credit hours weight the calculation — a 4-credit A contributes more than a 2-credit A to your GPA.

Nigerian 5.0 System

Nigerian universities use a 5-point grading system where A = 5.0 (70-100%), B = 4.0 (60-69%), C = 3.0 (50-59%), D = 2.0 (45-49%), E = 1.0 (40-44%), and F = 0.0 (below 40%). Degree classifications are: First Class (4.50-5.00), Second Class Upper (3.50-4.49), Second Class Lower (2.40-3.49), Third Class (1.50-2.39), and Pass (1.00-1.49). This system is widely used across Nigerian and some other West African universities.

How Credit Hours Affect GPA

Credit hours (or units) represent the weight of each course. A 4-credit course counts twice as much as a 2-credit course in your GPA calculation. Formula: GPA = (Σ grade points × credit hours) / (Σ credit hours). This means strategically choosing your course load can impact your GPA — performing well in high-credit courses has a larger positive effect on your overall GPA.

GPA for Graduate Admissions

Most US graduate programs require a minimum GPA of 3.0 for admission, while competitive programs expect 3.5+. Medical schools typically require 3.5-3.7+. Law schools consider both GPA and LSAT scores. However, GPA is just one factor — research experience, recommendation letters, personal statements, and standardized test scores also matter significantly. Some programs consider the trend of your grades (improvement over time) and the rigor of your coursework.