Test Grade Calculator: How to use & Convert Percentage into letter Grade

Test Grade Calculator tool

What is the handiest tool that comes as a saviour when you don’t want to perplex yourself by doing the boring calculations?? The tool that we are talking about is the test grade calculator. You need not worry about sitting and going through the time-consuming process of segregating the right answers from the wrong ones, further deducing the points earned in the particular test or assignment.

Also, known as test score calculator or teacher grader, this wonderful tool does the needful without any hassle or wasting much time and tells you about your position or about your performance in the class.

What is another wonderful feature about the test grade calculator is that you can also change the default setting and set the one that is more convenient to you. If you are still not sure about how to calculate the grades, then you might just want to give this article a thorough reading and be more confident about calculating your own test grades.

How to calculate test score?

It is very simple to calculate the test score. To calculate the percentile test score, all you need to do is divide the earned points by the total points possible. To simplify it further, you just want to find out your grades or percentage of the correct answers.

percentage score = #correct / #total


As #correct + #wrong = #total, we can write the equation also as:

percentage score = (#total – #wrong) / #total

Once you are done calculating the percentage of your correct answers, you need to convert them into a letter grade for more clarity as many teachers use the letter grade.

Letter Grade



























Below 60

If you don’t use the +/- grades, the scale may look like:

  • An A is 90% to 100%
  • A-B is 80% to 89%
  • A-C is 70% to 79%
  • A-D is 60% to 69%
  • and finally, an F is 59% and below – and it’s not a passing grade

The grading system mentioned above is a standard with the universities and schools of the US, however, it doesn’t imply that all schools, colleges and universities worldwide use the same conversion scale. The grading scale varies from school to school and your teacher might be using just any of it, depending on the grading scale.


As a student, you must know which grading scale is being used by your teacher, in order to be more adept to calculating your grades and deducing your performance and position in the class. At times, the border of passing score is not 60%, but e.g. 50 or 65%. What then? We’ve got you covered – you can change the ranges of grades!

Test Grade Calculator – How to Use it?

Now comes the most important part of how to actually use the test grade calculator. Once you are sorted post finding out the grade scale used by the school or college and by knowing the assignments and how you scored in them, you are almost done to calculate your test grades. You just need to use our effective Test Grade Calculator tool and find out where you stand.

  1. Enter the number of questions/points/problems in the student’s work (test, quiz, exam – anything). Let’s just take the hypothesis that you’ve prepared the test with 18 questions.
  2. Type in the number the student got wrong. Instead – if you prefer – you can enter the number of gained points. Let’s say our exemplary student failed to answer three questions.
  3. Here we go! Teacher grader tool is showing the percentage and grade for that score. For our example, the student got a score of 83.33% from a test, which corresponds to B grade.
  4. Underneath you’ll find a full grading scale table. So to check the score for the next students, you can type in the number of questions they’ve got wrong – or just use this neat table.

Test grade calculator – Other advanced mode options

Our test grade calculator gives you more features and options to explore. You can choose more options to customize this test score calculator according to your requirement. There is a separate advanced mode tab option that you can click to explore more.

  1. Increment by the box- here you can change the look of the table which you get as a result. The default value is 1, which means that the student can get an integer number of points. But sometimes it’s possible to get, e.g. half-points – then you can use this box to declare the increment between next scores.
  2. Percentage scale- in that set of boxes, you can change the grading scale from the default one.


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