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Imagine finishing a 15-question quiz and seeing 12/15 at the top of your paper. Did you do well? What percentage is that? And what letter grade does it become?
12 out of 15 is 80%. On a common U.S. plus/minus grading scale, 80% is a B-. However, the letter grade can vary because schools and teachers may use different grading scales.
How Do You Calculate 12/15 as a Percentage?
Converting 12 out of 15 to a percentage takes just two steps:
Divide 12 by 15.
12 ÷ 15 = 0.8
Multiply by 100.
0.8 × 100 = 80%
So:
12/15 = 0.8 = 80%
There is another easy way to see it. The fraction 12/15 can be simplified by dividing both numbers by 3:
12/15 = 4/5
Since 4/5 equals 0.8, it also equals 80%.
12 out of 15 as a percentage is 80%.
What Grade Is a 12/15?
The percentage is always 80%, but the letter grade depends on the grading scale your school or teacher uses.
On a common U.S. plus/minus scale, 80–82% is a B-. For example, grading scales published by Johns Hopkins University and several other U.S. institutions place 80–82% in the B- range.
12/15 = 80% = B-
Some schools use a simpler scale in which 80% is a B. That is why it is best to check the grading scale on your syllabus, assignment, or report card before deciding the exact letter grade.
What Does 12/15 Mean on a 15-Question Test?
If each question is worth the same amount, 12/15 means you answered 12 questions correctly and missed 3.
Because the test has only 15 questions, each question makes a noticeable difference. One question is worth:
That means:
This also shows why moving from 12/15 to 13/15 makes a noticeable difference: one additional correct answer raises the score from 80% to about 86.67%.
Is 12 Out of 15 a Good Grade?
Whether 12/15 is a good grade depends on your teacher's expectations and grading system, but mathematically it means you earned 80% of the available points.
If this was a 15-question quiz, you got 4 out of every 5 questions correct and missed 3 questions.
Explore more math topics related to division, fractions, decimals, measurements, and everyday math.
Remember
12 out of 15 = 12/15 = 4/5 = 0.8 = 80%
On a common U.S. plus/minus grading scale, that 80% corresponds to a B-, but your school's grading scale is the final authority.
