Grade Percentage Calculator
Turn a score and total possible points into a percentage and a typical US letter grade. Includes the formula, a worked example and how to read curved or weighted grades.
Results
Percentage
- Letter (typical US)
- B
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Educational estimates · not financial advice · free, no signup
Formula / how it works
Percentage = score ÷ total possible × 100. The letter is a typical US scale (90+ A, 80–89 B, 70–79 C, 60–69 D, below 60 F); your school may use a different scale.
Detailed guide
What it is, how to use it, how to read the numbers, common mistakes, a worked example, formulas, and FAQs.
What this calculator is
A raw score such as 43 out of 50 is hard to compare with 87 out of 100 until both are converted to percentages. This calculator divides the score by the total possible points and multiplies by 100, then maps the result to the letter band commonly used in the United States. It works for quizzes, homework, exams and any assignment scored out of a fixed total. Students use it to see where they stand after each assessment, and teachers use it to double-check a marked paper. It does not apply weights, curves or dropped scores; for the course-level picture, use the weighted grade or final-grade tools.
When to use / who it helps
- You received a score such as 43/50 and want to know the percentage.
- You want to know which letter band a score falls into on a common US scale.
- You are comparing results from assignments with different totals.
- A teacher gave you points and you need a percentage for an application or a form.
- You are checking a grade-book entry for arithmetic errors.
How to use
Steps
- Enter the score you earned, including partial credit.
- Enter the total possible points for that assignment.
- Read the percentage and the letter hint.
- Compare percentages across assignments, not raw points, when totals differ.
- For a course average, use the weighted grade calculator with the category weights from your syllabus.
- Check your school's grade scale if the letter does not match what appears on your report card.
How to interpret results
- The percentage is exact (score ÷ total); the letter is a convention and varies by school.
- Some schools use plus and minus grades, others round differently, and some use scales where 90 is not an A.
- A percentage on one assignment says nothing about the course grade, which depends on weights.
- Extra credit can push a score above 100%; the tool still reports the true ratio.
- Rounding a 89.6% up to 90% is a teacher's decision, not something this tool assumes.
Common mistakes & gotchas
- Using a different total than the instructor, for example including extra credit points in the denominator.
- Assuming every school uses 90/80/70/60 cut-offs.
- Averaging percentages from assignments with different weights as if they were equal.
- Rounding the percentage before comparing it to a cut-off score.
- Entering the number of wrong answers instead of the points earned.
Worked example
Worked example — 43 out of 50
- Divide the score by the total: 43 ÷ 50 = 0.86.
- Multiply by 100 to get a percentage: 86%.
- Check the letter band on a typical US scale: 80–89 is a B.
- Compare with 87 out of 100, which is 87%: slightly higher, even though the raw score is larger.
Result: 43/50 is 86%, a B on a typical US scale.
To load the form's own demo values, tap Try example above the Calculate button.
How to calculate / formula
Percentage = score ÷ total possible × 100. The letter is a typical US scale (90+ A, 80–89 B, 70–79 C, 60–69 D, below 60 F); your school may use a different scale.
Frequently asked questions
How do I calculate a percentage grade?
Divide your score by the total possible points, then multiply by 100. For 43 out of 50 the answer is 86%.
What percentage is an A?
Many US schools use 90% and above, but the cut-off varies. Check your syllabus for the scale used in your course.
How do I include extra credit?
Add the extra points to your score and decide with your instructor whether the total possible points changes. The tool reports the ratio you enter.
Can I get over 100%?
Yes, if your score exceeds the listed total because of extra credit. The percentage will then be above 100.
How is this different from the weighted grade calculator?
This tool converts a single score. The weighted grade calculator combines several categories using their percentage weights.
Does this work for non-US grade scales?
The percentage does, but the letter hint is a US convention. Other countries use different letters or number scales.