GPA Scale and Letter Grade Conversion
Review a common 4.0 letter-grade conversion and learn why official GPA scales can differ by school.
Related Calculators
- College GPA CalculatorCalculate a college or university GPA using course grades and credit hours.
- High School GPA CalculatorCalculate your high school GPA on a standard 4.0 scale using letter grades and course credits.
- Unweighted GPA CalculatorCalculate an equal-weight unweighted GPA from eight letter grades on a standard 4.0 scale.
- Weighted GPA CalculatorCalculate a weighted GPA by adding course-level points for honors, AP, IB, or advanced classes.
- Oakland University GPA CalculatorEstimate your Oakland University semester or cumulative GPA using OU's official 4.0 grade-point values.
- Purdue University GPA CalculatorEstimate your Purdue University semester GPA and cumulative graduation index using Purdue's published grade weights.
A Common 4.0 GPA Scale
A commonly used plus/minus conversion is:
- A or 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
- D− = 0.7
- F = 0.0
This is the scale used by the GPA calculators in this cluster.
Not Every School Uses the Same Values
Some schools do not use plus/minus grades. Others assign A+ a value above 4.0, use different decimal values, or calculate percentages directly.
Weighted Scales
A weighted scale may add points for honors, AP, IB, dual-enrollment, or other advanced courses. The amount and eligibility rules differ.
Use the Weighted GPA Calculator only after checking the weight used by your school.
Credits Still Matter
For a credit-weighted GPA, convert the grade to points and multiply by course credits before averaging.
Use the College GPA Calculator or High School GPA Calculator for a credit-weighted result.
Related Guides
- How Cumulative GPA WorksUnderstand the cumulative GPA formula — how grades from every semester combine into a running average, why it gets harder to change as you progress, and what affects it most.
- Weighted vs Unweighted GPAUnderstand how weighted and unweighted GPA differ and why the same transcript can produce two different values.
- How to Calculate Your University of Florida GPALearn how the University of Florida calculates GPA — quality points, credit hour weighting, and UF's specific GPA thresholds for Dean's List, probation, and graduation.
- How to Calculate GPALearn how letter grades, grade points, course credits, and quality points combine to produce GPA.
Frequently Asked Questions
- Is A+ always worth 4.0?
- No. Some schools assign 4.0, some assign a higher value, and others do not use A+ as a separate grade.
- Why is B+ shown as 3.3?
- That is a common plus/minus conversion, but an institution may use 3.33 or another value.
- Does a 90% always equal an A?
- No. Percentage-to-letter-grade cutoffs depend on the course or institution.
- Which GPA scale should I use?
- Use the scale published by the school or institution responsible for the official GPA.
Last updated 7/17/2026