How to Calculate GPA – Step by Step Instructions

How to Calculate your GPA
  • To calculate GPA, use formula (Average = Total sum of all values / Total number of all values).
  • To find out your CGPA, use formula [CGPA = Total Sum of (GPA * Credits) / Total Number of credits]

Nowadays, grade point averages have become a big deal for college students and their worrisome parents. A GPA is very easy to calculate if you understand that it’s just an average of values.

To determine an average, you have to add up all values given in a table or on a scale and then divide that total by the total number of values given. The tricky part about a grade point average is that it has letter grades involved and not just numbers and decimals. So, before you are able to calculate a GPA, get ready for some conversion work first! Want to know how to calculate GPA? Follow the instructions then.


The first thing you do in order to calculate a GPA is to convert each of your final grades into the right decimal-placed number. Here’s a simple scale for doing this:

Grade Percentile GPA
A+ 97-100 4.0
A 93-96 4.0
A- 90-92 3.7
B+ 87-89 3.3
B 83-86 3.0
B- 80-82 2.7
C+ 77-79 2.3
C 73-76 2.0
C- 70-72 1.7
D+ 67-69 1.3
D 65-66 1.0
F Below 65 0.0


According to this table, compare the grades on your report and determine where you stand. Here’s a case for you to easily understand:

Case Example for how to calculate GPA (i)

Let us consider the following table as your final result in a grade/percent class assessment:

Course Name Percentage
English 90
Maths 88
Physics 75
Chemistry 87
Geography 91
History 85
Computer Studies 72
Economics 96


Now following one simple instruction: Compare these results with Table-1.
According to the reference table, your grade point average looks something like this:

Course Name Percentage Grade GPA
English 90 A- 3.7
Maths 88 B+ 3.3
Physics 75 C 2.0
Chemistry 87 B+ 3.3
Geography 91 A- 3.7
History 85 B 3.0
Computer Studies 72 C- 1.7
Economics 96 A 4.0


If you haven’t noticed already, I have added two extra columns for ‘Grade’ and ‘GPA’ to easily see the complete grade point system for determining the GPA. The final step involves taking average of given values that would help us determine how you’ve scored. Let’s see:

Calculating Average(ii)

In principle, the average of any group of numbers is the sum of all numbers, divided by the total number of values present in the group. Mathematically,

Average = Total sum of all values / Total number of all values

Now if we put all required values into this formula, the Cumulative Grade Point Average or CGPA can be easily calculated. Let’s insert your grade values and find out how you’ve done:

Average = 3.7+ 3.3+ 2.0+ 3.3 +3.7 +3.0 +1.7 + 4.0 / 8

Average = 24.7 / 8

Average = 3.0875

This formula determines the grade point average out of 4.0. In other cases, sometimes you have to determine your GPA and CGPA based on the number of course credits you are enrolled in. To that effect, your report looks something like this:
Grade Point Average with Credits(iii)


Course Name Percentage Credits Grade GPA
English 90 1 A- 3.7
Maths 88 2 B+ 3.3
Physics 75 2 C 2.0
Chemistry 87 4 B+ 3.3
Geography 91 1 A- 3.7
History 85 1 B 3.0
Computer Studies 72 2 C- 1.7
Economics 96 2 A 4.0
  15 24.7


In this case:

CGPA = Total Sum of (GPA * Credits) / Total Number of credits

= 3.7+ 6.6 + 4.0 + 13.2 + 3.7 + 3.0 + 3.4 + 8.0 / 15

CGPA = 3.0333

We see the difference isn’t much, but in both cases the result is 98% to the same level of accuracy. In this way, we can calculate our grade point averages without the hassle of waiting for the result to come out on a later date!


Written by Umer Zahid