Free Online GPA Calculator is a handy online calculator you can use from anywhere. The is nothing to install or download, and no need to create an account. Simply enter your course credit hours and the grade you go. Once you have put in your hours and grades just click on the big blue Calculate GPA button. You can add as many grades and courses as you would like. Just click the "Add more" button. You can find details on exactly how it all works. Every grade has a number value called a grade point associated with it. An A for example has a value of 4.0 while a D has a value of 1.0. Your grade is calculate by multiplying your grade the number of course hours, adding up all your courses and averaging them out by dividing it by the total number of course hours.