4.0 GPA: What It Means, the Percentage and How to Get One
What a 4.0 really requires, how much one B costs you, and how weighted and unweighted GPAs differ.
A 4.0 GPA is a straight-A average on the standard unweighted scale: every course earns an A or A+, each worth 4.0 grade points. In percentage terms that usually means 93% or higher in every course, or 90% or higher if your school uses the flat 10-point scale. A single A- is worth only 3.7, so it brings a 4.0 down. You can check your own numbers with the GPA calculator, and our guide on how to calculate GPA covers the formula in full.
This guide explains what a 4.0 means, which percentage you need, how a single lower grade changes the total, and what a “4.0” means on a weighted scale.
- On the unweighted scale, a 4.0 means straight A’s (A or A+, both worth 4.0).
- The percentage needed is about 93% on the plus/minus scale, and 90% on the 10-point scale.
- One A- in five equal courses gives 3.94. One B gives 3.80.
- The older your record, the less a single B matters: one B moves a 4.0 to 3.80 after 15 credits, but only to 3.95 after 60.
- A weighted “4.0” can include B’s in AP or honors courses, so it is not the same as straight A’s.
What a 4.0 GPA means
GPA stands for grade point average. Each course grade is turned into grade points, and the points are averaged, with each course counted in proportion to its credit hours. On the common 4.0 scale, the top grade is worth 4.0 and an F is worth 0. A 4.0 therefore means that every graded course earned the top value, which is the highest you can reach on an unweighted scale.
Because the top grade is an A or A+, a 4.0 does not need a perfect 100%. It needs every course to land in the A band for your school.
The 4.0 scale chart
This is the plus/minus version used by many US high schools and colleges. Your school’s cut-offs may differ slightly, so check the handbook.
| Letter | Percentage | Grade points |
|---|---|---|
| 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 |
Notice that A+ and A are both 4.0, and that the step down to A- is 0.3 points. That small gap is why a single 90 to 92% can keep you from a 4.0.
What percentage is a 4.0 GPA?
There is no single percentage, because a 4.0 is a band. On the plus/minus scale you need 93% or more in each course. On the flat 10-point scale you need 90% or more. The scale your school uses matters: a 92% is a 4.0 on one and a 3.7 on the other.
| Course percentage | GPA (plus/minus) | GPA (10-point) |
|---|---|---|
| 97% | 4.0 | 4.0 |
| 95% | 4.0 | 4.0 |
| 93% | 4.0 | 4.0 |
| 92% | 3.7 | 4.0 |
| 90% | 3.7 | 4.0 |
| 89% | 3.3 | 3.0 |
| 87% | 3.3 | 3.0 |
| 85% | 3.0 | 3.0 |
| 83% | 3.0 | 3.0 |
| 80% | 2.7 | 3.0 |
To convert a percentage to a letter on the scale you use, try the letter grade calculator. For a side-by-side comparison of scales, read grading scales explained.
How much one lower grade costs
Suppose a student has five equal-credit courses and earns A in four of them. The fifth grade changes the GPA like this:
- One A- gives (4 × 4.0 + 3.7) ÷ 5 = 3.94.
- Two A- grades give (3 × 4.0 + 2 × 3.7) ÷ 5 = 3.88.
- One B gives (4 × 4.0 + 3.0) ÷ 5 = 3.80.
The effect shrinks as your record grows. Say a student has straight A’s apart from one 3-credit B. The more credits behind it, the smaller the dent:
| Total credits | GPA with one B |
|---|---|
| 15 | 3.80 |
| 30 | 3.90 |
| 60 | 3.95 |
| 120 | 3.975 |
The point is that one slip early can be recovered from, but you cannot get back to exactly 4.0 once a B is on the record. Averaging more A’s only moves you closer.
Weighted vs unweighted 4.0
An unweighted GPA treats every course alike. A weighted GPA adds bonus points for harder courses, commonly +1.0 for AP or IB and +0.5 for honors, although schools set their own rules. Under that rule a B in an AP course is worth 3.0 + 1.0 = 4.0.
Take a student with two AP B’s and three regular A’s. On the weighted scale the points are 4.0, 4.0, 4.0, 4.0 and 4.0, so the weighted GPA is 4.0. On the unweighted scale they are 3.0, 3.0, 4.0, 4.0 and 4.0, so the unweighted GPA is (3.0 + 3.0 + 4.0 + 4.0 + 4.0) ÷ 5 = 3.60. Same transcript, two very different numbers, so always say which GPA you are quoting. Our guide on how to calculate GPA shows both versions step by step.
Can a GPA be higher than 4.0?
On an unweighted scale, no. 4.0 is the maximum. On a weighted scale, yes: an A in an AP course is worth 4.0 + 1.0 = 5.0, so a weighted GPA can reach 5.0. A few schools also give an A+ a 4.3, which makes 4.3 the top of their scale. If you see a GPA above 4.0, check how the school weights courses before you compare it with anyone else’s.
How to earn a 4.0
- Know the target for each course. Find out whether an A starts at 93% or 90%, and aim a few points above the line.
- Track your grade every week. Enter your scores in a weighted grade calculator so you can see which category is holding you back.
- Plan the final exam early. Work out the score you need with the final grade calculator and our guide on how to calculate your final grade.
- Ask about extra credit before it matters. Read how extra credit works and ask your teacher early in the term.
- Check the rounding policy. If 92.5% rounds up to 93%, that half point can protect an A. See grade rounding.
- Get help early. Use office hours, tutoring or study groups as soon as a topic slips, not at the end of the term.
- Choose courses you can do well in. A challenging course with a solid B is often worth more than an easy A, so do not avoid rigor just to protect a 4.0.
Is a 4.0 GPA good?
Yes. A 4.0 is the top of the unweighted scale and shows consistently strong results. But it is only one part of a record. Colleges also look at how hard your courses were, how your grades changed over time and your other activities. Some schools also recalculate GPAs on their own scale, so the number on your transcript may not be the one they use. A 3.9 in tough courses can be more impressive than a 4.0 in easy ones, and one B will not end your chances.
Check your GPA
Enter your courses, grades and credits to see your GPA and CGPA.
Open the GPA and CGPA calculatorFrequently asked questions
What percentage is a 4.0 GPA?
About 93% or higher in every course on the plus/minus scale, or 90% or higher on the flat 10-point scale. Your school’s scale decides the exact cut-off.
Does a 4.0 GPA mean straight A’s?
On an unweighted scale, yes: every course is an A or A+. A weighted 4.0 can include B’s in AP or honors courses.
Can I get a 4.0 with an A-?
Not on an unweighted plus/minus scale, because an A- is worth 3.7. One A- in five equal courses gives 3.94. On the 10-point scale an A- does not exist, so a 90 to 92% is still a 4.0.
How much does one B lower a 4.0 GPA?
It depends on how many credits you have. With one 3-credit B, the GPA is 3.80 after 15 credits, 3.95 after 60 credits and 3.975 after 120 credits.
What is a 4.0 on a 5.0 scale?
It depends on the school. If AP courses add 1.0, a 4.0 weighted can be as low as a 3.0 average unweighted. Recalculate from the base letter grades to compare fairly.
Is a 90% a 4.0?
On the 10-point scale, yes. On the plus/minus scale, a 90% is an A- worth 3.7.
- Learn the formula in how to calculate GPA.
- Compare scales in grading scales explained.