If you have a score of 15 out of 20, this means that you answered correctly 15 questions out of the 20 questions allotted to you. In terms of grading, this score would result in a C grade, which is an average score. However, this is a disappointing score because you could have scored a B if you answered all the questions correctly.
The percentage grade calculator is a handy tool for quickly determining the percentage, letter grade or GPA for any test, quiz or exam. It is easy to use as you just have to enter the number of questions or points and the correct and incorrect answers and the percentage will be calculated automatically for you.
To calculate the percent, you can use the following method: The fraction is converted into decimal form by using the correct answer as the numerator and total questions as the denominator. You can also use the formula: % = (correct answers/total answers)/100. This is a very accurate and reliable way to find out the percentage for any given test. You can use this calculator for converting percentages to grade letters and GPA, as well as other calculations. You can also check out the letter grading scale table to get information about every letter grade available for specific numbers of questions.