Grade Conversion Table — Percentage, Letter Grade & GPA
Use this standard US grading-scale table to convert any percentage into a letter grade and its 4.0 GPA equivalent. Many schools use these exact cutoffs; always confirm with your own syllabus, since cutoffs and rounding rules vary.
| 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 |
How to read this table
Find your percentage in the middle column, then read the letter grade on the left and the grade-point value on the right. An 86% is a B (3.0 GPA), while an 89% is a B+ (3.3 GPA) — three points can move your GPA noticeably.
How conversions work: a worked example
Suppose your final score in Biology is 87%. Here is the conversion, step by step:
| Step | Math |
|---|---|
| 1. Find the range | 87 falls in the 87–89 band |
| 2. Read the letter grade | B+ |
| 3. Read the grade points | 3.3 on the 4.0 scale |
So 87% → B+ → 3.3 GPA points. One more point would not help — 88% is still a B+ — but 89% is where the B+ ceiling sits. That one-percentage-point difference between 86% (B, 3.0) and 87% (B+, 3.3) is why teachers' rounding policies matter so much.
Plus/minus grading: what to know
The plus/minus system splits each letter into three bands, which is fairer but makes small score differences matter more. Key notes:
- There is no A+ on the standard 4.0 scale — a 100% and a 93% both earn 4.0 grade points. Some schools award A+ as a label only, with no extra points.
- Minus grades cost points: an A− (3.7) is a third of a point below an A, and a B− (2.7) is below a B (3.0). Consistent A− grades across classes can pull a 4.0 dream down to ~3.7.
- Not every school uses plus/minus. Many K–12 schools use the simplified scale: 90+ = A (4.0), 80+ = B (3.0), 70+ = C (2.0), 60+ = D (1.0), below 60 = F (0.0). On that scale, an 89% is a plain B worth 3.0 — a full 0.3 points less than the B+ on the table above. Always check your school's policy before celebrating or panicking.
Weighted vs. unweighted GPA
Unweighted GPA treats every class the same on the 4.0 scale — an A in Art counts exactly like an A in AP Calculus. Weighted GPA rewards harder courses with bonus points, typically +1.0 for honors, AP, or IB classes:
| Course | Grade | Unweighted | Weighted (+1.0) |
|---|---|---|---|
| AP Chemistry | A | 4.0 | 5.0 |
| Honors English | B+ | 3.3 | 4.3 |
| Regular History | A | 4.0 | 4.0 |
This is why weighted GPAs can exceed 4.0 — colleges often look at both numbers, and they recalculate with their own weighting rules. The percentage-to-grade-points table above is the unweighted base; your school's handbook tells you the bonus rules.
Quick rule of thumb
Schools without plus/minus grades usually simplify the scale: 90+ = A (4.0), 80+ = B (3.0), 70+ = C (2.0), 60+ = D (1.0), below 60 = F (0.0). That simplified scale is what our class average calculator uses for its grade distribution.
Want to combine your assignment scores into one grade?
Open the Weighted Grade Calculator →Frequently Asked Questions
What is the standard US college grading scale?
The widely used scale is A for 93–100, A− for 90–92, B+ for 87–89, B for 83–86, B− for 80–82, C+ for 77–79, C for 73–76, C− for 70–72, D+ for 67–69, D for 63–66, D− for 60–62, and F below 60. Schools vary, so always check your own syllabus.
How do I convert a percentage to a 4.0 GPA?
Find your letter grade for the percentage on your school's scale, then read its grade-point value: an A is 4.0, an A− is 3.7, a B+ is 3.3, a B is 3.0, and so on down to an F at 0.0.
Is an A− still a 4.0 GPA?
No. On the standard 4.0 scale an A− is worth 3.7 grade points, while a full A (93–100) is worth 4.0. Some schools omit plus/minus grades entirely, in which case any A is 4.0.
What is the difference between weighted and unweighted GPA?
Unweighted GPA uses the plain 4.0 scale for every class. Weighted GPA adds bonus points — usually +1.0 — for honors, AP, or IB courses, so an A in AP Chemistry can be worth 5.0 instead of 4.0. That is why weighted GPAs can exceed 4.0.
How do I calculate my GPA from several classes?
Convert each class's percentage to grade points using the table, add them all up, and divide by the number of classes. For example, an A (4.0), a B+ (3.3), and a B (3.0) average to (4.0 + 3.3 + 3.0) ÷ 3 = 3.43.
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