A score of 138 out of 150 on a test, assignment or class is a 92% percentage grade. 12 questions were wrong or points missed.
A 92% is an A- letter grade. A letter grade A- means excellent performance. To get the next higher letter grade available, you would need a score of 140 which would be an A.
The grade point equivalent to an A- is a 3.7 GPA for this score.
| Grade | Correct | Incorrect | Percent |
|---|---|---|---|
| A+ | 146 to 150 | 0 to 4 | 97.33 to 100.00 |
| A | 140 to 145 | 5 to 10 | 93.33 to 96.67 |
| A- | 135 to 139 | 11 to 15 | 90.00 to 92.67 |
| B+ | 131 to 134 | 16 to 19 | 87.33 to 89.33 |
| B | 125 to 130 | 20 to 25 | 83.33 to 86.67 |
| B- | 120 to 124 | 26 to 30 | 80.00 to 82.67 |
| C+ | 116 to 119 | 31 to 34 | 77.33 to 79.33 |
| C | 110 to 115 | 35 to 40 | 73.33 to 76.67 |
| C- | 105 to 109 | 41 to 45 | 70.00 to 72.67 |
| D+ | 101 to 104 | 46 to 49 | 67.33 to 69.33 |
| D | 95 to 100 | 50 to 55 | 63.33 to 66.67 |
| D- | 90 to 94 | 56 to 60 | 60.00 to 62.67 |
| F | 0 to 89 | 61 to 150 | 0.00 to 59.33 |
This easy grade calculator can be used for quickly determining the percentage, letter grade and GPA for any test, quiz or exam. It can also be used when calculating an overall score in a class. This page is pre-populated showing the results for the particular calculation 138/150 as a percentage and as a grade. You can access the default calculator here.
To use, input the total number of questions or maximum points available in the "Questions" field. Next either enter the number of correct or incorrect answers in the respective fields. You only need to enter one, the other one will calculate automatically. Your results will appear as you type.
The result will compute the score as a percentage, the letter grade for the score and the GPA for the letter grade. The calculator will also indicate when a score is within one percent of the breakpoint between letter grades where it is appropriate to round up the grade.
Additionally you will see a letter grading scale table which shows every letter grade available for the number of questions on the test. This table indicates the correct and incorrect ranges for each letter grade along with the percentage ranges. Note that on some tests, letter grades are skipped - this is not a mistake. This happens on tests with fewer questions as each question is worth a significant percent of the overall score and significantly moves the letter grade.
The math is pretty simple to determine the percentage grade on a test as it's simple division and multiplication. The ratio of correct to total number of questions can be expressed as a fraction
correct answers / total questions
The fraction is converted into a decimal using correct answers as the numerator and total questions as the denominator. Divide the correct answers by total questions and you have the answer in decimal form.
correct answers ÷ total questions = decimal
Now to convert into a percent, multiply the decimal times 100. This is your answer.
decimal × 100 = percent answer
In this particular case, the formula for calculating the grade percent 138/150 is
138 ÷ 150 × 100 = 92%
On a 150 question test, if you miss 12 and get 138 right, you will have a 92%.
To determine the letter grade, we must make use of a letter grade scale lookup table. You can find one here.
Take the percentage calculated for the test and locate the corresponding range in the percent column. The letter grade for that row is the letter grade for this test.
For this score, we find our 92% is in the 90-92% range. This corresponds with the letter grade "A-". Thus, a 92% grade is a A-.