The GPA Scale: What the Numbers Mean, and Why Schools Disagree
Updated on Sep 13, 2026By CalculatNow Editorial Team8 min read
A 4.0 means an A and a 0.0 means an F, and almost everyone knows that much. The part that causes trouble is everything between them, where schools quietly disagree with each other.
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Two students can do identical work at different schools and end up with different GPAs. Nothing has gone wrong. There is no national grading scale in the United States, and the differences are small enough to be invisible until they matter.
What is the GPA scale?
The GPA scale converts letter grades into numbers so they can be averaged. On the standard scale an A is worth 4.0 and an F is worth 0, with every other grade falling between. Your GPA is the average of those numbers across your classes, weighted by how many credits each class carries.
This is the scale used by most US schools, and the one the CalculatNow calculator applies.
| Letter | Grade points | Percentage |
|---|---|---|
| A+ | 4.0 | 97–100 |
| A | 4.0 | 93–96 |
| A− | 3.7 | 90–92 |
| B+ | 3.3 | 87–89 |
| B | 3.0 | 83–86 |
| B− | 2.7 | 80–82 |
| C+ | 2.3 | 77–79 |
| C | 2.0 | 73–76 |
| C− | 1.7 | 70–72 |
| D+ | 1.3 | 67–69 |
| D | 1.0 | 63–66 |
| D− | 0.7 | 60–62 |
| F | 0.0 | Below 60 |
Read down the middle column and a pattern appears. Each full letter drops a whole point, and each plus or minus moves it by 0.3. That is the entire structure of the scale, and it is worth knowing because it tells you what a single grade is actually costing you.
Why your school's scale may differ
No national body sets the GPA scale. Each school, district or university publishes its own, and the table above is a common version rather than an official one.
The clearest admission of this comes from the College Board, which runs the SAT and is about as authoritative as this subject gets. It publishes a conversion table, then says in the same breath that the table gives only a general sense and is not necessarily a formula for calculating your true GPA. Its reason: some schools do not use pluses and minuses, and others set different cut-offs.
Three differences account for most of the variation:
Each of these is a real, published difference between schools, not a rounding preference.
| What varies | Common versions |
|---|---|
| The value of a minus grade | A− as 3.7 at some schools, 3.67 at others |
| Whether A+ beats A | Capped at 4.0 at most, worth 4.3 at some |
| Whether plus and minus exist at all | Some schools award only A, B, C, D and F |
The third is the one that changes results most. At a school with no minus grades, a 90% and a 96% are both simply an A, both worth 4.0. At a school that uses them, the 90% is an A− worth 3.7. Same work, three tenths of a point apart.
Key point
Your school's scale is the one that counts, and it is published — in the student handbook, the course catalogue, or the registrar's page. Everything else, this page included, is a common version.
Is a 3.25 an A or a B?
Neither, exactly. A 3.25 is an average, not a grade. It sits between a B (3.0) and a B+ (3.3), and it usually means a mix of grades rather than a transcript full of Bs.
This is the most common misreading of a GPA. The number describes a whole record, so it lands wherever the mix lands, and most averages fall between two letters rather than on one.
A rough translation, useful for reading a number at a glance rather than for anything official.
| GPA | Roughly equivalent to |
|---|---|
| 3.7 – 4.0 | Mostly As |
| 3.3 – 3.69 | As and Bs, leaning A |
| 3.0 – 3.29 | Mostly Bs |
| 2.7 – 2.99 | Bs and Cs, leaning B |
| 2.0 – 2.69 | Mostly Cs |
| Below 2.0 | Cs and Ds — often below the minimum to graduate |
To see which combination produced your own figure, put the actual classes into the GPA calculator rather than working backwards from the average. A single number can come from many different transcripts.
Percentages and the 4.0 scale
Converting a percentage to grade points is a two-step job, and the first step is where schools disagree. The percentage becomes a letter, and the letter becomes points. Only the second step is standard.
On the scale in the table above, an A starts at 93%. Plenty of schools start it at 90% instead. A student with 91% is an A− at one and a flat A at the other, which is 3.7 against 4.0 before anyone has disagreed about anything else.
Watch out
Never convert a percentage straight to a GPA by dividing by 25. A 90% is not a 3.6. The conversion runs through the letter grade, and the bands are not evenly spaced.
If you are working the other way, starting from percentages and wanting an average, the weighted average calculator handles the arithmetic directly. A GPA is a weighted average with credits as the weights.
When the scale goes above 4.0
A GPA above 4.0 is weighted. Schools that weight add extra points for harder classes, typically 0.5 for honors and 1.0 for AP or IB, which lifts the ceiling from 4.0 to 5.0.
It does not mean better grades than an A. It means harder classes, which is a different claim, and the full comparison is in weighted vs unweighted GPA.
The practical consequence for reading a scale: any GPA above 4.0 is on a different scale from any GPA below it, so the two cannot be compared directly. A published admissions average of 3.8 is almost always unweighted, and measuring a 4.3 against it tells you nothing.
Common mistakes
Using a generic chart instead of your school's. Every conversion table online is somebody's version. Yours is published by your school, and it is the only one your transcript follows.
Assuming a minus costs nothing. An A− is 3.7, not 4.0. Across a full year of A− grades the difference from straight As is three tenths of a point, which is the gap between a 4.0 and a 3.7 record.
Dividing a percentage by 25. It produces a number that looks like a GPA and is not one. The bands are uneven, and a 90% is an A− or an A depending on the school, never a 3.6.
Comparing GPAs across schools as if they were the same measure. Different scales, different cut-offs, different weighting. This is exactly why selective colleges recalculate applicants' GPAs on their own scale rather than trusting the number sent to them.
Averaging your term GPAs to get a cumulative one. That only works if every term carried the same number of credits. Credits are the weights, so a 12-credit term and a 18-credit term do not count equally.
Key takeaways
- On the common scale, a full letter is worth a whole point and each plus or minus moves it by 0.3.
- There is no national GPA scale. The College Board says its own table is not necessarily a formula for your true GPA.
- The three real differences are the value of a minus, whether A+ beats A, and whether plus and minus exist at all.
- A percentage becomes a GPA through the letter grade, never by dividing by 25.
- Anything above 4.0 is weighted, and cannot be compared with an unweighted figure.
GPA Calculator
Enter your classes and credits to see your GPA on the standard scale, weighted and unweighted.
Frequently asked questions
- Is GPA on a 4.0 or a 5.0 scale?
- Unweighted GPA runs 0 to 4.0. Weighted GPA runs 0 to 5.0, because honors and AP classes add extra points, usually 0.5 and 1.0. Most schools report one or the other, and any figure above 4.0 is weighted by definition.
- Is a 3.25 GPA an A or a B?
- Neither exactly. It is an average sitting between a B at 3.0 and a B+ at 3.3, and it normally reflects a mix of grades rather than a transcript of straight Bs. Averages usually land between two letters rather than on one.
- What percentage is a 4.0 GPA?
- On the common scale a 4.0 means an A, which starts at 93%. Some schools start an A at 90% instead. A perfect 4.0 average means every class earned an A, not that every score was 100%.
- How much does a minus grade cost?
- Three tenths of a point. An A is 4.0 and an A− is 3.7, and the same 0.3 gap applies at every letter. Over a full transcript of minus grades it is the difference between a 4.0 record and a 3.7 one.
- Is 2.7 a good GPA?
- A 2.7 is a B− average, which is above the usual 2.0 minimum for graduating but below what selective colleges typically expect. What counts as good depends entirely on what you are applying for, so compare it against the published average for those specific programmes.
- How do I convert a percentage to a GPA?
- Convert the percentage to a letter grade using your school's cut-offs, then convert the letter to points: A is 4.0, A− is 3.7, B+ is 3.3 and so on. Never divide a percentage by 25 — the grade bands are not evenly spaced.
How we worked this out
- How to Calculate Your GPA on a 4.0 Scale — College Board (BigFuture). Last checked Sep 13, 2026.
- GPA requirement — first-year admission — University of California. Last checked Sep 13, 2026.
