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Converting a raw percentage score into a letter grade is simple once you know the scale, but schools and instructors don't always list every cutoff clearly.
This calculator applies the standard US +/- letter grade scale (A+ down to F) to any percentage score.
How it works
Enter a percentage score. The tool checks it against the standard +/- letter grade scale and returns the corresponding letter grade.
- Enter percentage score.
- Click Calculate to see your results.
Examples
An 88.5% score
An 88.5% score falls in the B+ range (87-89%) on the standard scale.
Who should use it
- Quickly checking what letter grade a percentage score corresponds to.
- Estimating a final letter grade before an official grade is posted.
Industry applications
- K-12 and higher education
Advantages
- Instant conversion using a clear, standard scale.
- Covers the full +/- range, not just plain letter grades.
Limitations
- Uses one common scale — doesn't adjust automatically for schools with different cutoffs.
Common mistakes to avoid
- Assuming every school or instructor uses the exact same grading scale, when cutoffs can vary meaningfully between institutions.
- Confusing a plain A-F scale (no +/-) with the more granular +/- scale used here.
Best practices
- Check your specific course syllabus for its grading scale before relying on this as anything other than a general reference.
Tips
- Pair this with the Test Score Calculator to go straight from "correct answers out of total" to a letter grade in one step.