What This Calculator Estimates
This tool converts a percentage score into an estimated letter grade and its corresponding 4.0-scale grade point, using a standard US grading scale.
Formula / Method Used
Standard scale used: 97-100=A+ (4.0), 93-96=A (4.0), 90-92=A- (3.7), 87-89=B+ (3.3), 83-86=B (3.0), 80-82=B- (2.7), 77-79=C+ (2.3), 73-76=C (2.0), 70-72=C- (1.7), 67-69=D+ (1.3), 60-66=D (1.0), below 60=F (0.0).
Worked Example
An 88% score converts to a B+ letter grade, equal to 3.3 grade points on the standard 4.0 scale.
How to Interpret the Result
Use the letter grade and grade points as an estimate — always check your syllabus, since some schools use different cutoffs or skip plus/minus grading entirely.
Common Mistakes
- Assuming every school uses identical percentage cutoffs.
- Ignoring rounding rules your instructor may apply (e.g. 89.5% rounding up to 90%).
- Using this for pass/fail or non-traditional grading systems where it doesn't apply.
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Frequently Asked Questions
What does this grade converter do?
It converts a percentage score into an estimated letter grade and 4.0-scale grade point using a standard grading scale.
What grading scale does this use?
It uses a common US scale: 93-100=A, 90-92=A-, 87-89=B+, 83-86=B, 80-82=B-, and so on down to F below 60.
Do all schools use the same scale?
No, grading scales vary by school and even by individual instructor, so treat this as an estimate.
Can I convert a letter grade back to a percentage?
This tool converts percentage to letter grade; check your syllabus for the exact percentage range your school uses for each letter.
Why does my school's grade differ from this estimate?
Some schools round differently or don't use plus/minus grades at all — always confirm with your official syllabus.
Last updated: July 2026