1/3 Grading Scale

So we needed a way to translate the rubric scores to percentages because our district's grading scale is more percentage based (0 - 100). The district scale is:

93-100 A

85-92 B

75-84 C

70-74 D

0-69 F

We wanted something more specific than just 4, 3, 2, or 1 because it is possible for a student to master some of the level 3 content and all of the level 2 content. It wouldn't make sense to give that kid a 2 or a 3. We needed some middle ground. We considered using .5, but we also felt like that wasn't specific enough. After much discussion we settled on a .33 grading scale. Here it is: 

4.0 – 100% A

3.67 – 97% A

3.33 – 92% B

3.0 – 90% B

2.67 – 83% C

2.33 – 77% C

2.0 – 70% D

1.67 – 67% F

1.33 – 63% F

1.0 – 60% F

<1.0 – 50% F

So if a student mastered the level 3 content and got a minimal amount of level 4 content correct, he or she would receive a 3.33. That indicates proficient with a low-partial proficiency at advanced content.

Also, the top tier from 3 to 4 is not split into even sections. We decided to make a 3.33 a 92% B instead of a 93% A. It didn't make sense to have three opportunities for an A and only one for a B.