Skip To Main Content

How do grades convert between 4 and 100 points?

Conversion Scale

Sometimes, outside organizations such as those providing scholarships or colleges seek information on a conversion between our 4 point scale and a 100 point scale.  For those purposes, the following information is provided.

Average Scale Score Across Multiple Standards 100 Point Scale
3.75-4.00 97-100
3.26-3.74 93-96
3.00-3.25 90-92
2.50-2.99 80-89
2.00-2.49 70-79
1.50-1.99 66 – 69
0.00-1.49 50 – 65


It is important to remember when considering overall grades (commonly referred to as omnibus grades) that any attempt to summarize a student’s status across a variety of topics involves decisions regarding where to end one grade designation and where to begin another. There is logic to the system that is quite consistent with the design of the proficiency scale. Namely, the grade of A begins at 3.0 because a score of 3.0 indicates that a student has demonstrated understanding of all content in a target learning goal with no major errors or omissions. This makes some intuitive sense – if the student’s average score indicates that he or she knows everything that was taught for the target learning goals, he or she should receive an A. The B grade range, 2.50 to 2.99, also has an intuitive logic to it. Having an average score within the range implies that across the learning goals addressed in a given grading period, the student typically demonstrated mastery of all the basic content (score 2.0 content) and partial mastery of the score 3.0 content directly taught for the target learning goals.  (Marzano, A Handbook for High Reliability Schools, 94)  A grade below a 1.50 requires that a student repeat the course.