A letter grade of C is the same as a percent grade of 73. A percent grade must lie between the range of 73 and 76 to be regarded as a C; however, this can vary amongst institutions.
A 2.0 grade point average corresponds to a letter grade of C. Similar to this, a student needs to acquire a percent grade of 77 to 79 in order to achieve a grade point average of 2.3, which is equal to a C+. A student must obtain a percent grade of 70 to 72 in order to attain a grade point average of 1.7, which is equal to a C-.