GPA to Letter Grade Converter
Convert a numeric GPA into its closest letter grade band, or convert a letter grade back to its GPA value. Includes an approximate percentage.
How the GPA-to-letter converter works
This is a bidirectional lookup. In one direction you enter a numeric GPA and the tool returns the nearest letter-grade band, with the approximate percentage range. In the other direction you pick a letter and the tool returns its grade-point value on the 4.0 scale, plus the percentage band most US schools associate with that letter. Both directions use the standard unweighted 4.0 convention.
The formula
Every letter grade maps to a fixed grade-point value on the 4.0 scale: A = 4.0, A- = 3.7, B+ = 3.3, B = 3.0, B- = 2.7, C+ = 2.3, C = 2.0, C- = 1.7, D+ = 1.3, D = 1.0, D- = 0.7, F = 0.0. To convert GPA → letter, the tool finds the letter whose grade-point value is closest to your input. A 3.65 input lands closer to A- (3.7) than B+ (3.3), so the tool returns A-. A 3.2 input lands closer to B (3.0) than B+ (3.3), so it returns B.
To convert letter → GPA, the tool just looks up the grade-point value. A B+ returns 3.3. An A- returns 3.7. The percentage band is the most common US convention: A = 93–100, A- = 90–92, B+ = 87–89, B = 83–86, B- = 80–82, and so on.
Worked example
A student finishes the term with a semester GPA of 3.475. Is that an A- average or a B+ average? The distance to A- (3.7) is 0.225; the distance to B+ (3.3) is 0.175. The closer band is B+, so the student's term looks more like a B+ average than an A-. In percentage terms, 3.475 sits between 86 and 89% — solidly in the B+ range, just below the A- threshold.
Going the other way: what GPA does a B+ represent? Exactly 3.3. If a student earned B+ in every single course, their unweighted GPA would be 3.3 — not 3.5, as naive rounding might suggest.
Why the mapping is approximate
A GPA is an average of many grade points, so it almost never lands on an exact letter value. A 3.5 GPA is not a "B+ plus a little A-" in any meaningful sense — it is a mathematical average. The letter-grade summary is a communication convenience, not an exact description. A 3.5 might mean a transcript full of A-/B+ grades, or a roughly even mix of A's and B's, or something more scattered. The single letter loses that texture.
Scale caveats
- A+ is not always 4.33. On the standard unweighted scale used here, A+ is treated as 4.0 (same as A). Only extended scales — used by some elite colleges and graduate programs — push A+ to 4.33.
- Percentage bands vary by school. The 93/90/87/83... convention is common in the US but not universal. Some schools use A = 90+, others A = 94+. Treat the percentage as a guide, not gospel.
- Weighted GPAs can exceed 4.0. A weighted scale with AP/IB bonuses can produce GPAs up to 5.0. This tool only handles the unweighted 4.0 scale — feed it a weighted GPA and the letter-grade lookup will be nonsense above 4.0.
Common mistakes
- Converting a weighted GPA. A 4.3 weighted GPA is not "A+" — it reflects AP/Honors weighting. Use the Weighted GPA calculator or strip the weighting before converting.
- Using the letter to predict a percentage. Percentage bands are approximate. A B+ letter grade tells you the grade is somewhere in the 87–89% range, not exactly 88%.
- Forgetting D grades exist. A 1.0 GPA is a D, not an F. D is a passing grade at most institutions, though it may not count toward major requirements.
What this tool is not
It is a lookup utility, not a grading authority. It cannot resolve your school's specific cutoffs, grade-replacement policies, or international-transcript conversions. For official letter-grade assignments on your transcript, rely on the grades your instructors post through the registrar.