Letter Grade Calculator
Whether you just got a test score back or you’re tallying up an entire semester, a letter grade calculator turns any numerical grade into the letter grade it represents. Enter your percentage — or the points you earned out of the total points possible — and the tool instantly converts your score into a letter grade on the standard A–F grading scale, along with its matching GPA value.
It’s built for the moment you don’t want to dig through a syllabus or eyeball a grade conversion chart. A student can check exactly where a quiz, midterm, or final exam lands. A teacher can run through a stack of assignments without doing the percentage-to-letter-grade math by hand. The calculator handles the conversion in one step so you can focus on the result.
Letter Grade Calculator
Convert any percentage into its letter grade in a click.
GPA: —
Type a percentage to convert it to a letter grade and GPA.
Standard grading scale
| Letter | Percentage | GPA |
|---|---|---|
| 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 | 0–59 | 0.0 |
How letter grades work
A letter grade maps a percentage onto a letter and an approximate GPA point value. The cutoffs below follow the standard US scale, where each letter spans a few percentage points and each step is worth about 0.3 to 0.4 GPA.
Schools vary, so treat this as a close guide rather than an official rule — always confirm the exact cutoffs your institution uses.
Type the percentage and the calculator shows the matching letter grade and the approximate GPA on a 4.0 scale.
No. The standard US scale is common, but schools differ — always check your institution’s official scale for exact cutoffs.
On a 4.0 scale, a B+ is about 3.3 and typically covers 87–89%.
How to Use the Letter Grade Calculator
- Enter your score. Type in your percentage directly, or input the points earned and total points possible and the tool will compute the percentage for you.
- Pick your grading scale. Choose the standard A–F scale, or a plus/minus scale (A+, A−, B+, and so on) if your school uses one.
- Calculate. The calculator converts your numeric score into the matching letter grade and shows its grade point value on the 4.0 GPA scale.
One detail worth knowing: many grading scales round to the nearest whole percent, so a score like 89.5% is often rounded up and treated as an A. If your course doesn’t round, the calculator reflects the raw score instead.
What Is a Letter Grade?
A letter grade is a single symbol — A, B, C, D, or F — that summarizes academic performance on an assignment, course, or term. Behind every letter is a numerical grade and a grading scale that defines which percentages map to which letter. Each letter covers a grade range rather than a single value, which is why an 84% and an 88% can both be a B.
The grading scale is simply the set of grade cutoffs the institution agrees on. Convert the percentage against those boundaries and you get the letter grade equivalent. That conversion is exactly what this tool automates.
Percentage to Letter Grade: The Standard Conversion Chart
The most widely used grading scale in the United States is the 10-point scale, where each letter spans ten percentage points:
| Letter Grade | Percentage Range | GPA (4.0 scale) |
|---|---|---|
| A | 90–100% | 4.0 |
| B | 80–89% | 3.0 |
| C | 70–79% | 2.0 |
| D | 60–69% | 1.0 |
| F | Below 60% | 0.0 |
Keep in mind that exact grade cutoffs vary by school and even by instructor — the scale above is the common default, not a universal rule.
Plus/Minus Grading Scale
Many colleges and high schools use a more granular plus/minus scale that splits each letter into three bands. A typical version looks like this:
| Letter Grade | Percentage Range | GPA (4.0 scale) |
|---|---|---|
| A | 93–100% | 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 few schools also recognize an A+ (97–100%), though most cap the grade point value at 4.0 so it carries the same weight as an A.
Letter Grade to GPA
Your GPA, or grade point average, translates letter grades into a single number on the 4.0 scale. Each letter is worth a set amount of grade points — also called quality points — as shown in the charts above: an A is 4.0, a B is 3.0, a C is 2.0, a D is 1.0, and an F is 0.0.
There’s an important distinction between two kinds of GPA. An unweighted GPA treats every course the same, so the maximum is 4.0. A weighted GPA gives extra grade points to harder classes — honors, AP, or IB courses — and can push the scale above 4.0 (often to 5.0). When you’re converting a letter grade to GPA, the same letter can be worth different points depending on which scale your school applies.
Grading Scales Explained
Not every school uses the same system, and the grading scale you’re held to changes how a percentage becomes a letter grade.
- 10-point scale. The most common setup, with each letter covering ten points (the standard chart above).
- 7-point scale. An older, tighter scale where an A starts at 93%, a B at 85%, a C at 77%, and a D at 70%. Less common today but still used in some districts.
- Plus/minus scale. Adds finer bands within each letter for more precise grading.
- Pass/fail. Replaces letters entirely with a simple pass or fail mark, often for elective or credit/no-credit courses.
Weighted Grades, Final Grades, and Cumulative GPA
A single letter grade rarely stands alone — it usually feeds into a larger number. Most courses use a weighted grade, where categories like homework, quizzes, tests, and the final exam each count for a different share of your overall grade. The letter grade calculator handles the conversion for one score; to combine categories you’d reach for a weighted grade calculator or a final grade calculator that accounts for how much each piece is worth.
Across a full term, your course grades roll up into a semester or cumulative GPA. That’s where a GPA calculator comes in: it averages the grade points from every class on your transcript or report card into one figure. Understanding how a lone test score converts to a letter is the first step; weighting and averaging are what turn those letters into the number that lands on your transcript.
Passing vs. Failing Grades
On most grading scales, a D (60% or higher) is the lowest passing grade, and anything below 60% is a failing F. So in the strict sense, yes — a D is technically passing.
That said, the minimum passing grade depends on the context. Plenty of college programs require at least a C to earn credit toward a major, and some scholarships or prerequisites set the bar higher still. Always check the syllabus or course requirements rather than assuming a D will count everywhere.
Grading on a Curve and Extra Credit
Two common adjustments can shift where your letter grade lands. Grading on a curve rescales scores relative to the class average, so your letter grade depends partly on how everyone else performed rather than on a fixed cutoff. Extra credit works in the opposite direction, adding points on top of your earned score to nudge a borderline grade up. The calculator works from your final numeric score, so apply any curve or extra credit first, then convert.
Who Uses a Letter Grade Calculator
The tool is useful for anyone working with grades. Students in high school, college, or any K–12 grade level use it to check where a single assignment or an overall course grade stands. Teachers and professors use it to convert scores quickly while grading, without flipping back to a grading scale every time. Because it’s a free online calculator, it’s just as handy for a quick gut-check before a test result is official as it is for finalizing grades at the end of a quarter.
Frequently Asked Questions
What letter grade is 70%?
On the standard 10-point scale, 70% is a C. On a plus/minus scale it’s typically a C− (70–72%).
What is 85% as a letter grade?
An 85% is a B on the standard scale. On a plus/minus scale it falls in the B range (83–86%).
Is a D a passing grade?
Yes — a D (60% and above) is the lowest passing grade on most grading scales. However, some courses and programs require a C or higher to earn credit, so a D may not always count.
What GPA is a B?
A B is worth 3.0 on the unweighted 4.0 GPA scale. A B+ is 3.3 and a B− is 2.7 on a plus/minus scale.
How do you calculate your letter grade?
Take your numerical score as a percentage, then match it to the grade ranges on your grading scale — 90–100% is an A, 80–89% a B, and so on. The letter grade calculator does this conversion automatically.
What is the lowest passing grade?
On a standard scale, the lowest passing grade is a D at 60%. Anything below 60% is an F.
What grade is a 3.5 GPA?
A 3.5 GPA sits between a B+ (3.3) and an A− (3.7), so it reflects roughly a B+/A− average across your courses.