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A single test or assignment score is usually reported as points, not a percentage — 42 out of 50, 17 out of 20 — and converting that to both a percentage and a letter grade in your head isn't always quick, especially on an unusual point scale. This calculator takes the points earned and points possible and instantly gives you the percentage and the standard US letter grade it corresponds to.
This calculates a single score's grade — for combining several graded courses into a GPA, see DocNectar's GPA Calculator instead, which weights by credit hours across an entire term rather than converting one score to a percentage.
How it works
Enter how many points you earned and how many were possible on the assignment, quiz or test. The calculator divides earned by possible to get a percentage, then matches that percentage to the standard US letter grade scale (97%+ is A+, down through F below 60%).
- Enter the points earned.
- Enter the points possible.
- Read the percentage and letter grade instantly.
Examples
A standard 100-point test
Scoring 85 out of 100 gives an 85% — a B grade on the standard scale.
An unusual point scale
Scoring 42 out of 50 on a quiz gives 84% — also a B, showing the calculator works the same regardless of how many total points the assignment was worth.
Who should use it
- Converting a test or quiz score to a percentage and letter grade.
- Checking a grade on an unusual point scale without doing the division by hand.
- Quickly verifying a grade before it's recorded.
Industry applications
- K-12 and higher education
- Online course platforms
- Test prep and tutoring
Advantages
- Works correctly on any point scale, not just out of 100.
- Handles extra-credit scores above 100% correctly.
- Instant percentage and letter grade in one step.
Limitations
- Uses one standard US percentage scale — doesn't support custom or alternative grading scales.
- Single-score calculation only, not weighted across multiple assignments.
Common mistakes to avoid
- Assuming every institution uses the exact same percentage cutoffs for letter grades.
- Confusing a single assignment's percentage grade with an overall GPA, which is weighted differently across a whole term.
- Miscalculating by hand on an unusual point scale (like 17 out of 23) instead of just dividing directly.
Best practices
- Check your specific school or course's grading scale if the exact letter-grade cutoff matters for an official record.
- Use this for individual assignment/test grades, and the GPA Calculator for combining a full term's courses.
Tips
- If your school uses a non-standard grading scale, use this for the raw percentage and apply your institution's specific cutoffs yourself.
- For a running GPA across multiple courses, use the GPA Calculator instead of averaging individual percentage grades.