GPA Scale & Grading Chart
Interactive reference charts for standard 4.0, weighted 5.0, 10-point, and university-specific grading systems.
| Letter Grade | Standard Grade Points (4.0) | Honors (+0.5) | AP / IB (+1.0) | Percentage Range |
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Understanding U.S. Grading Scales
In the United States, most universities and high schools calculate grade points using a 4.0 maximum unweighted scale. In this system, an A corresponds to 4.0 quality points per credit hour, a B is 3.0, a C is 2.0, a D is 1.0, and an F earns 0.0.
Weighted systems (used heavily in high schools for class rank and honors admissions) add grade increments - typically +0.5 for Honors and +1.0 for Advanced Placement (AP), International Baccalaureate (IB), and Dual Enrollment (DE) courses.
Comparison of Major U.S. Grading Systems
Standard 4.0 (Plus/Minus)
Widely used in U.S. colleges and universities. Plus (+) adds 0.30 points while minus (-) subtracts 0.30 points from the base letter (e.g. B+ = 3.3, B- = 2.7).
Simple 10-Point Scale
Common in many high schools and middle schools. No plus or minus points; any score 90-100 is an A (4.0), 80-89 is a B (3.0), etc.
Weighted 5.0 / 6.0 Scales
Secondary schools award extra grade points for rigorous AP, IB, AICE, or Honors classes, elevating the theoretical top GPA above 4.0.
Frequently Asked Questions
Grading scales vary significantly by institution. In most standard college and high school systems using plus/minus modifiers, 80-82% is assigned a B- (2.7 grade points). In simple 10-point scale systems without minuses, 80-89% is a flat B (3.0 grade points). In weighted high school AP/IB classes, an 80% can earn up to 3.7 or 4.0 weighted grade points. Always verify your school district or university registrar rubric.
A C+ typically represents scores in the 77% to 79% range. It indicates satisfactory academic mastery above the minimum passing benchmark. While 2.3 is standard across most U.S. institutions, some universities use 2.333 or omit plus/minus modifiers entirely.
Standard U.S. grading typically caps grade points at 4.0 for both A and A+ so that students cannot exceed a 4.0 unweighted GPA. However, select colleges (and law school LSAC calculations) credit an A+ as 4.33 quality points.
The standard U.S. breakdown is: 90-100% = A, 80-89% = B, 70-79% = C, 60-69% = D, below 60% = F. While some curved college STEM courses may assign a C to lower raw percentages, the common reference scale treats 60% as a D.
A B+ places you above the general class average in most undergraduate and secondary courses. It contributes positively toward honors thresholds and graduate school eligibility.
Under the standard 10-point plus/minus system: 93-96% is an A (4.0), 97-100% is an A+ (4.0), and 90-92% is an A- (3.7). However, individual instructors and syllabi can establish custom cutoffs (for example, requiring 94% for a full A).