<p>It all depends on your school, and many different schools have many different systems, but in general:</p>
<p>90-100 = 4.0 (A)
80-89 = 3.0 (B)
70-79 = 2.0 (C)
60-69 = 1.0 (D)
0-59 = 0.0 (F)</p>
<p>Remember that this is per class. Convert each class to the 4.0 scale, and then average out.</p>