How the GPA scale works
Every grade you earn exists in three forms — a percentage, a letter, and a number of grade points — and the GPA scale is the map that connects them. A percentage lands inside a letter’s range, each letter is worth a fixed number of grade points, and your GPA is the credit-weighted average of those points across your courses. Learn the map once and you can move freely between all three.
Suppose you finished a course with 455 of 520 total points. That works out to 455 ÷ 520 = 87.5%, which rounds to 88% and sits in the B+ band — worth 3.3 grade points. Do the same for every course, weight each by its credits, and the average is your GPA.
Plus, minus, and why an A+ is still 4.0
A plain letter sits on a base value, and a plus or minus nudges it by roughly 0.3: a B is 3.0, a B+ is 3.3, and a B- is 2.7. The ceiling is the twist — an A+ and an A are both worth 4.0, so an A+ cannot push an unweighted GPA above a 4.0. A minority of schools break that rule and award 4.3 for an A+, and some drop pluses and minuses entirely. Whenever the numbers matter, your transcript’s own grading legend is the final word.
The unweighted 4.0 scale (whole letters)
The simplest form of the scale ignores pluses and minuses and gives each letter a round value. Plenty of schools report GPA this way, and it’s the version most quick estimates use:
| Letter | Grade points |
|---|---|
| A | 4.0 |
| B | 3.0 |
| C | 2.0 |
| D | 1.0 |
| F | 0.0 |
The plus/minus table at the top of this page is the more precise version — use whichever one your school actually reports.
The weighted scale (Honors, AP and IB)
High schools frequently report a weighted GPA that rewards harder courses with bonus grade points — commonly +0.5 for Honors and +1.0 for AP or IB. Because of the bonus, a weighted GPA can climb above 4.0, reaching 5.0 for a transcript of straight-A AP work:
| Letter | Regular | Honors (+0.5) | AP / IB (+1.0) |
|---|---|---|---|
| A | 4.0 | 4.5 | 5.0 |
| B | 3.0 | 3.5 | 4.0 |
| C | 2.0 | 2.5 | 3.0 |
| D | 1.0 | 1.5 | 2.0 |
| F | 0.0 | 0.0 | 0.0 |
The high school GPA calculator applies these bonuses automatically when you mark a course Honors or AP/IB, and the weighted grade calculator handles weighting inside a single class.
From grades to GPA, step by step
- Convert each grade to points using the tables above (or the converter at the top).
- Multiply by credits — grade points × credit hours = that course’s quality points.
- Add up the quality points across all your courses.
- Divide by total credits. The result is your GPA.
Here’s a full five-course college term worked end to end:
| Course | Grade | Points | Credits | Quality points |
|---|---|---|---|---|
| Microeconomics | A | 4.0 | 3 | 12.0 |
| Organic Chemistry | B+ | 3.3 | 4 | 13.2 |
| Art History | A- | 3.7 | 3 | 11.1 |
| Statistics | B | 3.0 | 3 | 9.0 |
| Ethics Seminar | A | 4.0 | 2 | 8.0 |
The quality points add up to 53.3 over 15 credits, so the GPA is 53.3 ÷ 15 = 3.55. Notice how the 4-credit B+ carries more weight than the 2-credit A. Rather not do this by hand? The GPA calculator runs every step live as you type.
Converting percentages and international grades
To turn a raw percentage into a GPA, find the letter its band falls into on the table above, then read off the points — an 84% is a B (3.0), a 91% is an A- (3.7). Grades from other countries don’t map cleanly onto the US 4.0 scale, and there is no single official formula: an Indian first-class percentage, a UK upper-second, and a US B all describe different things. The percentage-to-GPA page covers international conversion in detail and explains why any such number is only an estimate.
Not every school uses the same cutoffs
The scale on this page is the most common US standard, but it is not universal. Some schools use a straight 90 / 80 / 70 / 60 split with no pluses or minuses; some use a 10-point band per letter; some cap A+ at 4.0 while others award 4.3; and the exact points for minus grades differ from place to place. When two sources disagree, the one printed on your own transcript wins.
Converting a GPA back into letters and percentages
The scale runs both directions. To turn a GPA back into an approximate letter and percentage, find the nearest grade-point value: a 3.7 is an A- (about 90–92%), a 3.0 is a B (about 83–86%), a 2.0 is a C. A GPA that lands between two letters — say 3.5 — means your grades averaged out somewhere between a B+ and an A- across your courses, not that every class was a 3.5. For any specific figure, the per-value pages below spell out the letter, percentage and context: see, for example, a 3.5 GPA, a 3.0 GPA, or a perfect 4.0 GPA.
The 7-point vs 10-point scale
Two cutoff systems dominate, and they disagree on the edges. The plus/minus (7-point) scale at the top of this page splits each letter into narrow bands — an A is 93–96%, an A- is 90–92% — and is common at colleges. The 10-point scale is simpler and widespread in high schools: 90–100% is an A, 80–89% a B, 70–79% a C, 60–69% a D, and below 60% an F, with no pluses or minuses at all. The consequence is real: the same 88% is a B+ (3.3) on the plus/minus scale but a straight B (3.0) on the 10-point scale. Neither is "more correct" — what matters is which one your school prints on your transcript, so check its grading legend before you trust any conversion.
Why your scale matters
Your GPA feeds class rank, scholarship and honors eligibility (including Latin honors like cum laude), athletic and financial-aid thresholds, and graduate- and professional-school applications. Knowing exactly how each grade converts lets you set realistic targets and see what a given result will do to your average before it’s locked in. Pair this page with the how-to-calculate-GPA guide and the calculator to plan ahead, or the guide to raising your GPA if you need the number to move.