GPA Scale Explained: 4.0, 5.0, and Weighted Systems (2026 Guide)

A GPA scale is the conversion table that turns letter grades into the numeric value that gets averaged into your grade point average. The 4.0 scale is the US default, but it isn't the only one — high schools weight Honors and AP classes on a 5.0 scale, some elite private schools use 4.3 or even 4.33, and international transcripts use entirely different number ranges. This post lays out every scale you'll see on a real US transcript, shows the letter conversion for each, and explains how to compare a GPA across systems without losing your mind.

The 50-word version

The standard US college GPA scale is 4.0, where A=4.0, B=3.0, C=2.0, D=1.0, F=0. High schools commonly use a weighted 5.0 scale that gives Honors and AP classes a +0.5 or +1.0 bonus. Some schools use 4.3 (A+ = 4.3) or 4.33 scales. Use a weighted GPA calculator for AP/Honors-heavy schedules and an unweighted GPA calculator when you need the standardized version.

The standard 4.0 unweighted scale

This is the scale that almost every US college, every job application, and every standardized GPA conversion uses as the baseline. It maps every letter grade to a number between 0.0 and 4.0:

Letter	GPA value	Percentage range (typical)
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	65-66%
F	0.0	Below 65%

Two things to notice:

1. A+ does not exceed 4.0 on the standard scale. Some schools award an A+ but cap the GPA value at 4.0, so a transcript full of A+'s still tops out at a 4.0 cumulative. This is why "perfect 4.0" is the marketing language for top high-school students even when their letter average is technically higher.
2. The percentage ranges vary by district. A score of 92% might be an A- in one high school and an A in another. The letter is what gets converted, not the raw percentage. For more on this, see Percentage to GPA Conversion.

The 4.0 scale is what colleges, grad schools, scholarship committees, and employers expect to see. It's what shows up on the Common Application, on grad school applications, and on most internship forms. If a form just says "GPA" with no qualifier, it means the 4.0 unweighted scale.

For the full breakdown of the 4.0 scale on its own, see The 4.0 GPA Scale Explained.

The weighted 5.0 scale (high school)

High schools that offer Honors, AP, IB, and sometimes Dual Enrollment classes use a weighted scale that gives extra credit for taking harder coursework. The most common version is the 5.0 weighted scale:

Course type	Unweighted (A)	Weighted (A) on 5.0 scale
Regular	4.0	4.0
Honors	4.0	4.5
AP / IB / Dual Enrollment	4.0	5.0

The same letter scaling applies — B+ in an AP class is 4.3 on a 5.0 scale (3.3 unweighted + 1.0 weighting bonus). The exact weighting differs by district:

• +1.0 for AP, +0.5 for Honors (most common — pushes max GPA to 5.0)
• +0.5 for both AP and Honors (more conservative — pushes max to 4.5)
• +1.0 for AP, +1.0 for Honors (a few districts — pushes max to 5.0 for any honors course)

You can hit a weighted GPA above 4.0 — sometimes well above — by taking heavy AP/Honors loads. A student with all A's in 8 AP classes can post a 5.0 weighted while their unweighted GPA is 4.0.

For the full mechanics, see How Weighted GPA Works and Weighted vs Unweighted GPA.

The 4.3 and 4.33 scales

Some high schools and a smaller number of US colleges (often private liberal arts and a handful of elite institutions) use a scale that goes up to 4.3 or 4.33, treating A+ as worth more than a plain A:

Letter	4.3 scale	4.33 scale
A+	4.3	4.33
A	4.0	4.00
A-	3.7	3.67
B+	3.3	3.33
B	3.0	3.00
B-	2.7	2.67
C+	2.3	2.33
C	2.0	2.00

The difference is small in absolute terms — only the A+ value changes — but it matters for class rank and for valedictorian eligibility. A student at a 4.3-scale school with a 4.05 cumulative is doing slightly better than an "all A" student at a 4.0-scale school.

If your school uses a 4.3 or 4.33 scale and you're applying to colleges that report on a 4.0 scale, list both with the scale labeled: GPA: 4.05 / 4.3. Admissions officers know how to read it.

The 5.0 unweighted scale (rare)

A small number of schools — mostly competitive magnet high schools and a few private institutions — use a 5.0 unweighted scale where A=5, B=4, C=3, D=2, F=1. This is unusual enough that you should always note the scale: GPA: 4.6 / 5.0 (unweighted). Without the qualifier, anyone reading the resume will assume the 4.0 standard and think you're inflating.

The 100-point scale

Some high schools, especially in New York State and the southern US, report grades as a 0-100 percentage and never convert to a 4.0 GPA on the transcript at all. Colleges that receive these transcripts do the conversion internally — they have established formulas per school district. If you need to convert for a resume or application, the rough mapping is:

Percentage	GPA (4.0 scale)
95-100	4.0
90-94	3.7-3.9
85-89	3.3-3.6
80-84	3.0-3.2
75-79	2.7-2.9
70-74	2.0-2.6
Below 70	0.0-1.9

For more precise conversion, use a percentage to GPA calculator and run the numbers semester by semester rather than averaging the average.

International GPA scales

If you studied outside the US, your transcript will use whatever system your country uses, and you'll need to convert to a 4.0 scale for US applications.

• UK degree classifications: First Class = 4.0, Upper Second (2:1) = 3.5-3.7, Lower Second (2:2) = 3.0-3.3, Third = 2.5. See UK Grade to GPA Conversion for the full breakdown
• Indian percentage / CGPA: 90%+ usually converts to 4.0, 80-89% to 3.5-3.7, 70-79% to 3.0-3.3. CGPA on a 10-point scale divides differently — a 9.0 CGPA is roughly 3.7 on a US 4.0 scale
• German Notenskala (1-5 scale, where 1 is best): 1.0 = 4.0, 1.5 = 3.7, 2.0 = 3.3, 2.5 = 3.0, 3.0 = 2.5
• Australian / New Zealand 7-point GPA: 7 = 4.0, 6 = 3.5, 5 = 3.0, 4 = 2.0

US grad school applications usually require a WES (World Education Services) evaluation that does this conversion officially. For undergrad and most jobs, you can list the original GPA and provide the US equivalent in parentheses: GPA: 78% (≈ 3.5 / 4.0).

How to read a GPA when the scale isn't labeled

If someone hands you a GPA without saying which scale, use these defaults:

1. GPA between 0 and 4.0 → 4.0 unweighted scale, almost certainly
2. GPA between 4.0 and 5.0 → weighted high school GPA, on a 5.0 scale
3. GPA exactly 4.0 → could be a perfect unweighted, or weighted but not maxed out — ask
4. GPA above 5.0 → unusual; probably a different scale (some districts use 6.0 weighted) or a typo
5. GPA listed as 4.3, 4.33, or with that range → 4.3 scale, A+ awarded
6. GPA listed with "/" notation (e.g., 3.7/4.0) → the denominator is the scale; trust it

When in doubt, ask. A 3.8 GPA on a 5.0 weighted scale is a much weaker signal than a 3.8 on a 4.0 unweighted scale, and the difference matters at every gatekeeper from college admissions to graduate school to job applications.

Cumulative vs semester GPA

GPA scales apply identically to both semester GPA and cumulative GPA — the scale is the conversion mechanism, not the time window. A student with a 3.8 fall semester on a 4.0 unweighted scale and a 3.6 spring semester has a cumulative of 3.7 if both semesters carried the same credit load.

The cumulative GPA is what colleges report on transcripts and what most applications ask for. The semester GPA matters for Dean's List eligibility, academic probation thresholds, and tracking improvement over time. For the difference and how to compute each, see How to Calculate Cumulative GPA and Cumulative vs Semester GPA.

Which scale do colleges use to evaluate applicants?

The answer most college admissions offices give: they recalculate your high school GPA on their own scale before reviewing. The University of California system has its own formula. Most Common App schools convert to a 4.0 unweighted and use that as the primary comparison number, then look at the weighted GPA as supporting context for course rigor.

What this means practically:

• A weighted 4.6 with a strong AP load and a recalculated 3.9 unweighted will read better to admissions than a weighted 4.6 with a 3.6 unweighted
• The course difficulty itself (AP/IB/Honors) is a separate evaluation factor from the GPA number
• Self-reported GPA on the Common App should use what your high school transcripts list, with the scale specified

For more on how Ivy League and top schools handle this, see Ivy League Average GPA.

Quick reference card

Scale	Where it appears	Range	A =	What to remember
4.0 unweighted	US colleges, jobs, grad school	0.0-4.0	4.0	The default; A+ caps at 4.0
5.0 weighted	US high schools w/ AP/Honors	0.0-5.0	4.0-5.0	AP = +1.0, Honors = +0.5 typical
4.3	Some private schools, magnets	0.0-4.3	4.0	A+ = 4.3
4.33	Liberal arts colleges	0.0-4.33	4.00	Variant of 4.3
5.0 unweighted	Magnet schools, some private	0.0-5.0	5.0	Rare; always label
100-point	NY, southern HS	0-100	90+	Converted by colleges
UK 1st/2:1/2:2	UK universities	classifications	First Class	Convert via WES for US
Indian CGPA	Indian universities	0-10	9-10	Divide by 2.5 for rough 4.0 equivalent

Common pitfalls

• Reporting a weighted GPA without the qualifier. A 4.5 weighted looks like a typo or inflation if you don't say "weighted, 5.0 scale." Always label
• Rounding the wrong way. GPA scales convert exactly — your 3.467 cumulative rounds to 3.47, not 3.5. The transcript will show the precise number, and rounding up gets caught at verification
• Mixing scales mid-resume. If you list your high school weighted GPA and your college unweighted GPA on the same page, label both. Side-by-side mismatched scales confuse readers
• Assuming all 4.0 scales convert identically. A 4.0-scale school that doesn't award + or - grades will produce slightly different cumulatives than one that does. The averaging mechanics matter

Related reading

• The 4.0 GPA Scale Explained — deep dive on the US standard
• How Weighted GPA Works — the mechanics behind 5.0 scales
• Weighted vs Unweighted GPA — which one matters for which audience
• How to Calculate Cumulative GPA — the math behind the scale
• Percentage to GPA Conversion — when you only have percentages
• UK Grade to GPA Conversion — the most-requested international conversion

When you need to compute a number, use the weighted GPA calculator for AP/Honors-heavy schedules or the unweighted GPA calculator when you need the standardized 4.0 version that goes on every application.