US GPA Scale Explained: 4.0, 70%, and Grading System (2026)

The US GPA scale is the standard way American high schools and colleges measure academic performance. If you've ever wondered what "3.5 GPA" means, how 70% converts to a 4.0 scale, or why some students have GPAs above 4.0 — this guide explains everything clearly.

What Is GPA in the USA?

GPA stands for Grade Point Average. It's a single number that averages all your course grades on a standardized scale — usually 0.0 to 4.0. US colleges, scholarship programs, and employers use GPA to compare students fairly, no matter which school they attended.

Most US high schools and universities use the 4.0 unweighted scale, but many use a 5.0 weighted scale for honors, AP, and IB classes.

US GPA Grading System Chart (4.0 Scale)

Here's the standard US grading system that nearly every school follows:

Letter Grade	Percentage	GPA (Unweighted)	GPA (Weighted AP/Honors)
A	93–100%	4.0	5.0
A-	90–92%	3.7	4.7
B+	87–89%	3.3	4.3
B	83–86%	3.0	4.0
B-	80–82%	2.7	3.7
C+	77–79%	2.3	3.3
C	73–76%	2.0	3.0
C-	70–72%	1.7	2.7
D	60–69%	1.0	1.0
F	Below 60%	0.0	0.0

What Is 70% on the 4.0 GPA Scale?

70% equals approximately 1.7 GPA on the 4.0 scale (a C- grade). This is considered below average for most US colleges. Most four-year universities require a minimum 2.5 GPA for admission, and competitive schools expect 3.5+.

Here's a quick conversion chart:

• 90% = 3.7 GPA (A-)
• 80% = 2.7 GPA (B-)
• 70% = 1.7 GPA (C-)
• 60% = 1.0 GPA (D)

How to Calculate Your GPA (Step-by-Step)

The GPA formula is simple:

GPA = (Sum of Grade Points × Credits) ÷ (Total Credits)

Example: 4 Courses

• English (3 credits) — A = 4.0 → 12.0 points
• Math (4 credits) — B = 3.0 → 12.0 points
• History (3 credits) — B+ = 3.3 → 9.9 points
• Science (3 credits) — A- = 3.7 → 11.1 points

Total points = 45.0 | Total credits = 13

GPA = 45.0 ÷ 13 = 3.46

Use our free GPA calculator to skip the manual math and get instant results.

Weighted vs Unweighted GPA — What's the Difference?

Unweighted GPA caps at 4.0. An A in regular English and an A in AP English both equal 4.0.

Weighted GPA gives extra points for harder classes. AP, IB, and Honors classes can push your GPA up to 5.0. This rewards students who take challenging coursework.

Most colleges recalculate your GPA on their own unweighted scale during admissions, but they still look at the difficulty of your classes.

What Is a Good GPA for US Colleges?

• 4.0+ — Ivy League, MIT, Stanford range
• 3.5–3.9 — Top 50 universities
• 3.0–3.4 — Most state universities
• 2.5–2.9 — Community college transfer, some state schools
• Below 2.5 — Community college recommended first

Frequently Asked Questions

What is GPA in USA?

GPA (Grade Point Average) is a number from 0.0 to 4.0 (sometimes 5.0) that averages all your course grades. US schools use it to measure academic performance and colleges use it for admissions.

What is 70% on the GPA 4.0 scale?

70% converts to approximately 1.7 GPA on the 4.0 scale — a C- grade.

How do I calculate my GPA on the 4.0 scale?

Multiply each course grade point by its credit hours, add them all up, then divide by your total credit hours. Use our GPA calculator for instant results.

Is a 3.5 GPA good?

Yes. A 3.5 unweighted GPA is considered very good and qualifies you for most top-100 US universities and many scholarships.

What is the highest GPA possible?

4.0 unweighted, or 5.0 weighted (for AP/IB/Honors classes). Some schools even use a 6.0 scale for the most advanced courses.