What is the Letter Grade for a 13/15 Score?

A score of 13 out of 15 is about 86.7%. On many U.S. grading scales, that falls in the B range, though the exact letter grade varies by school and instructor.

You can calculate it by dividing the points earned by the points possible: 13 ÷ 15 = 0.8667, or about 86.7%.

A common grading scale used by many U.S. schools is:

• A range: 90% to 100%
• B range: 80% to 89%
• C range: 70% to 79%
• D range: 60% to 69%
• F: Below 60%

Because there is no single national grading scale, schools and instructors may use different cutoffs or plus/minus systems. On many grading scales, 86.7% is a B. It could be a B+ if your school uses a lower B+ cutoff or rounds the score to 87%. Check your syllabus or online gradebook for the official grading policy used in your class.

One assignment rarely equals your final course grade by itself. How much 13/15 matters depends on the assignment's weight in the syllabus. For example, if the assignment is worth 10% of your course grade, an 86.7% on it contributes about 8.67 percentage points toward the final average. GPA is usually calculated from final course letter grades, not from individual quizzes or papers. Related conversions: 14 out of 20 and what an 88 letter grade means.

Bottom line: 13 out of 15 is 86.7%, usually a B. Your syllabus determines the official letter grade and how much the assignment affects your course average.