Percentage to Letter Grade: The Real Conversion Chart (and Why Cutoffs Differ)
If you searched for a percentage to letter grade conversion, you probably wanted one thing: a clean chart that tells you what letter an 88 or a 91 becomes. You will get exactly that below — a full A+ to F table with the common percentage bands and their 4.0-scale grade points. But before you screenshot it, here is the part the one-tap converter tools quietly skip: there is no national cutoff standard. The same 90% can be an A- at one school and a straight A at another, and that gap is not a rounding quirk. It is policy.
In the United States, letter grades (A–F), the 4.0 GPA scale, plus/minus modifiers, and the A+ itself are local conventions, not federal rules. Your district, your college registrar, and often your individual instructor each set their own cutoffs and grade-point values. So treat any grade percentage chart (including this one) as illustrative, then confirm the real numbers in your syllabus. This guide gives you the common scale, names two universities whose scales genuinely differ, and works an example that turns category scores into a single course grade.
The Common Percentage to Letter Grade Chart
Here is the scale cited most often across US high schools and colleges. The middle column is a typical percentage band; the right column is the grade-point value on the 4.0 scale, matching the standard conversion published by College Board. Read it as a starting point, not a rule.
| Letter | Percentage (typical) | Grade points (4.0 scale) |
|---|---|---|
| A+ | 97–100 | 4.0 |
| A | 93–96 | 4.0 |
| A- | 90–92 | 3.7 |
| B+ | 87–89 | 3.3 |
| B | 83–86 | 3.0 |
| B- | 80–82 | 2.7 |
| C+ | 77–79 | 2.3 |
| C | 73–76 | 2.0 |
| C- | 70–72 | 1.7 |
| D+ | 67–69 | 1.3 |
| D | 63–66 | 1.0 |
| D- | 60–62 | 0.7 |
| F | Below 60 | 0.0 |
A+ and A both map to 4.0 here: on this common scale the A+ is an honor on the transcript but adds nothing extra to your GPA. The bands are also narrow — most are only three or four points wide, which is why a single quiz can flip you from a B+ to an A-.
Why There Is No Single Percentage to Letter Grade Standard
The reason two honest charts disagree is that schools make three independent choices, and almost nobody makes them the same way.
Choice one: plus/minus or straight letters. On a plus/minus scale, 90–92 is an A- and you need 93 for a full A. On a straight-letter scale, everything from 90 to 100 is simply an A. So a 90% is an A- at one school and an A at the other — same score, different letter, different GPA weight. Neither is wrong; they answer to different policies.
Choice two: where the number lives. Most college registrars do not publish a percentage-to-letter chart at all. They publish the grade-point value of each letter and leave the percentage cutoffs to each instructor's syllabus. That is why the hard numbers — "an 89.5 rounds up," "the A- starts at 90," "no curve" — usually appear on page one of your syllabus, not in a campus-wide rulebook. In K–12, the district often sets the bands, and those vary district to district too.
Choice three: what the letters are even worth. Two named registrars make the point. The University of California awards an A+, but it counts as 4.0 grade points (the same as a plain A), so a UC record tops out at 4.0. MIT does not use the 4.0 scale at all: it computes GPA on a 5.0 scale, where an A is worth 5.0, a B is 4.0, and so on down. Two respected universities, two scales that line up with neither each other nor the chart above. Elsewhere you will find schools that award the A+ as 4.3 and schools that do not award one at all. Confirm these details with each registrar directly — policies get revised, and this is exactly the kind of number people misquote.
Layer on weighted grading (the common convention of adding 0.5 for Honors and 1.0 for AP or IB courses, with a 5.0 ceiling), and the divergence grows. That bump is widespread but not universal, and it is US-specific; for the mechanics, see how grade weighting works. The chart tells you the neighborhood, your syllabus tells you the address.
From Percentage to a Course Grade: A Worked Example
Most of the time, the question underneath "what letter is my score" is really "what is my course grade" — a weighted-average problem, not a lookup. Suppose your syllabus reads Homework 20%, Quizzes 25%, Midterm 25%, Final 30%, and your scores are:
- Homework: 94% → 0.20 × 94 = 18.8
- Quizzes: 88% → 0.25 × 88 = 22.0
- Midterm: 81% → 0.25 × 81 = 20.25
- Final: 90% → 0.30 × 90 = 27.0
Add those up: 88.05%. On the common chart that is a B+ (the 87–89 band, 3.3 grade points). But watch what policy does to it: at a straight-letter school, 88 is just a B; at a school with an 88 A- cutoff, an A-. Same work, three different letters.
Doing that by hand for a full semester is where mistakes creep in, so let the Grade Calculator do it. You enter each item's score and weight, and it returns your current grade as both a percentage and a letter. It also flags weights that do not add up to 100%, the single most common error when people copy a syllabus. Because the tool runs entirely in your browser, your scores are never uploaded and no account is created — reasonable peace of mind when you are typing in real grades. Once you have a letter for each course, the GPA Calculator turns those letters plus credit hours into a credit-weighted GPA on the 4.0 scale. To gauge whether that number is "good," what is a good GPA adds context, and how grading works explains the machinery behind the letters.
For Students Outside the US
If you are reading this from outside the United States, the portable part of the chart is the left column — the percentage bands. The letters and the 4.0 grade points are US conventions and will not map cleanly onto a UK classification, a German 1.0–5.0 scale, an Indian CGPA, or ECTS grades. Use the percentage as your anchor and find your own system's local equivalent rather than forcing marks into A–F.
One warning for anyone converting grades for a real application: any percentage-to-4.0 or CGPA-to-4.0 figure from a chart or free tool is an estimate for planning only. Graduate admissions and immigration cases generally require an official course-by-course evaluation from a NACES member such as World Education Services, which uses country- and institution-specific tables no generic converter reproduces. Estimate to plan; never submit an estimate as if it were official. For the longer version, see converting international grades to GPA.
Frequently Asked Questions
What letter grade is 78%?
On the common plus/minus scale, 78% is a C+ — it sits in the 77–79 band and is worth 2.3 grade points. At a school that uses straight letters, a 78 is simply a C. Check your syllabus for the exact cutoff, because a school with a 78 B- cutoff would score it differently.
Is 89% an A or a B?
On the common scale an 89% is a B+, not an A — the A- range usually begins at 90. That said, some instructors round an 89.5 up, and a few schools set the A- cutoff at 88. If a single point is the difference between two letters for you, the syllabus is the only authority that counts.
What percentage is an A?
Commonly, 93–100 is a full A and 90–92 is an A- on a plus/minus scale. On a straight-letter scale, anything 90 and above is an A. Both are widely used, so the answer genuinely depends on your school. Treat these numbers as illustrative and confirm yours.
What GPA points is a B+?
On the standard 4.0 scale, a B+ is 3.3 grade points, following the College Board conversion. Some registrars use 3.33 instead, and a handful of schools that do not use plus/minus would simply record a B at 3.0. Your registrar's grade-point table is the deciding source.
Is there a standard grading scale?
No. There is no national or global cutoff standard. Districts, colleges, and individual instructors set their own percentage bands, grade-point values, and honors weighting. Even the 4.0 ceiling is not universal — MIT computes GPA on a 5.0 scale. Any chart you find online, including this one, is a common convention rather than a rule.
Do colleges recalculate my GPA?
Often, yes. Many admissions offices recalculate applicants' GPAs onto their own scale (stripping or re-weighting honors bumps and counting only core academic courses), which is why course rigor and your grade trend frequently matter more than a single raw number. It is one reason the exact letter for one 88% assignment matters less than the overall picture.
Turn Your Scores Into a Real Grade
A conversion chart answers "what letter is this score." It cannot answer "what is my grade in the course" — that depends on how your assignments are weighted and which cutoffs your instructor chose. Use the chart above to read a single score, then let the Grade Calculator combine your weighted scores into one current course grade, percentage and letter, right in your browser with nothing uploaded. When the semester ends, roll those letters into the GPA Calculator. And whatever the tool shows, do the last step by hand: open your syllabus and confirm the cutoffs, because that is the only chart that grades you. None of this is admissions, academic-standing, or financial-aid advice — just clearer math so you always know where you stand.