The most common GPA scale in the United States is the 4.0 scale, where A = 4, B = 3, C = 2, D = 1 and F = 0. Many high schools also use a weighted 5.0 (or 6.0) scale that adds points for Honors and AP classes, some colleges add an A+ worth 4.3, and schools in other countries use 100-point, 12-point, 10-point and other systems. Knowing which scale your number is on matters more than the number itself: a 3.5 means something very different on a 4.0 scale than on a 12-point one.
Here is a tour of the main scales, with real examples and the mistakes to avoid when comparing them.
The main GPA scales at a glance
| Scale | Top value | Where you'll see it | Example meaning of "A" |
|---|---|---|---|
| 4.0 unweighted | 4.0 | Most U.S. high schools and colleges | A = 4.0 |
| 4.0 with plus/minus | 4.0 | Many U.S. high schools and colleges | A = 4.0, A− = 3.7, B+ = 3.3 |
| 4.3 | 4.3 | Some U.S. colleges that reward A+ | A+ = 4.3, A = 4.0 |
| Weighted 5.0 | 5.0 | U.S. high schools with Honors/AP bonuses | AP A = 5.0 |
| Weighted 6.0 (and higher) | 6.0+ | Some Texas and other districts | Varies by course level |
| 100-point (percentage) | 100 | Report cards in the U.S. and many countries | Often 90–100 |
| 12-point | 12 | McMaster University and some other Canadian schools | A+ = 12 |
| 10-point CGPA | 10 | India and some other countries | Varies by university |
| No GPA | — | Narrative-evaluation colleges | Written evaluation instead |
Common App's GPA scale menu shows how wide this range is: it offers every whole number from 4 through 20, plus 100, and an N/A option for schools that use a different scale or don't calculate a cumulative GPA.
The 4.0 scale (unweighted)
This is the scale most people mean by "GPA." Each letter grade gets a fixed number of points, and you average them by credits.
Many schools refine it with plus and minus grades. Fairfax County Public Schools, for example, publishes this table: A = 4.0, A− = 3.7, B+ = 3.3, B = 3.0, B− = 2.7, C+ = 2.3, C = 2.0, C− = 1.7, D+ = 1.3, D = 1.0, F = 0.0. The site's College GPA Calculator uses a very similar table, with A+ also at 4.0 and a D− at 0.7.
Good for: comparing grades alone. Watch out for: schools that use whole letters only, where an A− counts as a full 4.0.
For the step-by-step formula, see how to calculate GPA.
The 4.3 scale
Some colleges give an A+ 4.3 points instead of 4.0, which lets a GPA rise slightly above 4.0 without any course weighting. If your transcript shows a GPA like 4.05 and you took no Honors classes, this is probably why. When comparing, remember that most other schools cap an A+ at 4.0.
Weighted 5.0 and 6.0 scales
Weighted scales add value for harder classes. The most common version starts with the 4.0 table and adds 0.5 for Honors and 1.0 for AP, IB or dual enrollment, so an AP A becomes 5.0. FCPS uses exactly those bonuses.
Other districts give each course level its own scale. Some Texas schools label their regular, Honors and AP courses as 5.0, 5.5 and 6.0 tiers, so their top values are higher even though the steps between levels are similar.
Good for: recognizing harder schedules. Watch out for: comparing weighted numbers from different schools, which may use different bonuses. The weighted GPA guide explains the math, and 4.0 vs. 5.0 vs. 6.0 GPA scales compares the labels side by side.
The 100-point (percentage) scale
Many report cards show a percentage for each class (for example 92). Schools then turn those percentages into letter grades with their own cut-offs. FCPS, for instance, treats 93–100 as an A and 90–92 as an A−, while other schools use 90–100 for an A.
Because the cut-offs vary, there is no single percentage-to-GPA formula. The percentage to 4.0 GPA conversion guide shows the usual approach, and the China 100-point conversion guide covers that system specifically.
The 12-point scale
McMaster University in Ontario grades on a 12-point scale: A+ = 12, A = 11, A− = 10, and so on down to F = 0. Its registrar also publishes a 4.0 column next to the 12-point values (A+ = 4.0, A = 3.9, A− = 3.7). Note that the 4.0 values are not a straight one-third of the 12-point values, which is why dividing by 3 gives the wrong answer. The full table and a worked conversion are in the 12-point to 4-point scale chart.
The 10-point CGPA scale
Many Indian universities report a cumulative grade point average (CGPA) out of 10. Each university sets its own grade points, so converting to 4.0 needs care. See the Indian 10-point GPA conversion guide, and use the CGPA to GPA Calculator for a quick proportional estimate.
Other systems you may meet
- UK degree classes (First, 2:1, 2:2, Third) are not GPAs at all. See the UK class system guide.
- IB Diploma subjects are graded 1–7, which is a different structure from a GPA. The IB to GPA guide explains how to handle it.
- Narrative transcripts. A few colleges don't give grades. The Evergreen State College says plainly that because its courses are not graded, students won't have a GPA; the transcript is a written narrative instead.
A short history of letter grades
GPA scales grew out of local experiments rather than one national standard.
- 1785, Yale: Yale College credits President Ezra Stiles with adopting one of the first grading systems in the American colonies, a four-level scale using Latin categories: optimi, second optimi, inferiores boni and pejores (best, second best, less good and worse).
- 1897, Mount Holyoke: Mount Holyoke College's library describes the college developing a letter grading system in 1897, making it the first recorded school to do so.
Letter grades and point averages then spread school by school rather than through one national rule, and individual schools still adjust their tables today. That patchwork history is why the same letter can carry slightly different points at different schools.
How to compare two scales without mistakes
- Write down the scale with the number. "3.6 on a 4.0 unweighted scale" is useful; "3.6" alone is not.
- Check for weighting. A weighted 4.4 and an unweighted 3.9 can describe the same transcript.
- Convert grade by grade, not average by average. Scales are rarely straight lines, so convert each course using the published table, then average.
- Follow the application's instructions. If a form asks for your GPA as your school reports it, don't convert it. If it offers a scale menu like Common App's, pick your school's scale or N/A.
Frequently asked questions
What is the most common GPA scale?
In the United States, the 4.0 scale is the most widely used, often with plus and minus grades. Weighted 5.0 scales are common in high schools that give bonuses for Honors and AP classes.
Is a 4.0 on a 5.0 scale good?
On a weighted 5.0 scale, a 4.0 usually means mostly As and Bs with some advanced classes, or straight As in regular classes. Look at your unweighted GPA too for a fuller picture.
Can I convert a GPA from one scale to another by dividing?
Only as a rough estimate. Real scales are not evenly spaced (McMaster's A = 11 maps to 3.9, not 3.67), so convert each course with the published table when one exists.
Why does my college use a different scale than my high school?
Each school sets its own grading policy. Colleges commonly add plus and minus grades or an A+ value, and they don't use high school Honors or AP bonuses.