The GPA scale conversion is usually given in the class syllabus. The syllabus for the class will include more details such as conversions for B+ or 85% which could be equal to 3.5. Our calculator has a general 4.0 GPA scale that should work for most people. ... GPA: Grade Equivalence A4.00 B+3.33 B3.00 B-2.67 8 more rows