Calculate weighted grades, final exam scores needed, and course grades with letter grade conversions
Calculate weighted grades, final exam scores needed, and track your academic progress
Calculate the score needed on remaining assignments to achieve your target grade
A grade calculator is a tool that helps students and teachers determine course grades based on weighted assignments, exams, and other assessments. It can calculate both current grades and the scores needed on remaining assignments to achieve desired final grades.
Calculate overall course grade based on weighted assignments
Grade = Σ(Score × Weight) / Σ(Weight)
Determine score needed on final to achieve target grade
Required = (Target - Current) / Final Weight
Convert between percentages and letter grades
A+ = 97-100%, A = 93-96%, etc.
| Letter Grade | GPA | Percentage Range | Description |
|---|---|---|---|
| A+ | 4.3 | 97-100% | Exceptional |
| A | 4.0 | 93-96% | Excellent |
| A- | 3.7 | 90-92% | Very Good |
| B+ | 3.3 | 87-89% | Good |
| B | 3.0 | 83-86% | Above Average |
| B- | 2.7 | 80-82% | Average |
| C+ | 2.3 | 77-79% | Below Average |
| C | 2.0 | 73-76% | Satisfactory |
| C- | 1.7 | 70-72% | Minimum Passing |
| D+ | 1.3 | 67-69% | Poor |
| D | 1.0 | 63-66% | Very Poor |
| D- | 0.7 | 60-62% | Barely Passing |
| F | 0.0 | 0-59% | Failing |
Homework (20%): 85%
Midterm (30%): 92%
Final Exam (50%): 88%
Weighted Grade = (85×0.2) + (92×0.3) + (88×0.5)
Weighted Grade = 17 + 27.6 + 44 = 88.6%
Final Grade: B+
Current Grade: 87% (B+)
Target Grade: 90% (A-)
Final Exam Weight: 40%
Required Final Score = (90 - 87) / 0.4
Required Final Score = 97.5%
The modern letter grading system has evolved significantly over time. In 1785, Yale University used a ranking system with "optimi" as the highest rank, followed by "second optimi," "inferiore," and "pejores." Harvard University initially used a numerical system from 1-200, later switching to a "Classes" system (I-V) around 1883.
Mount Holyoke College became the first institution to use letter grades similar to today's system in 1887, using A, B, C, D, and E (where E represented failure). The system was stricter than today's standards, with failure defined as anything below 75%. The letter F was later added to represent failing grades.
Some institutions have experimented with alternative grading approaches. Saint Ann's School in New York City uses anecdotal reports instead of letter grades, focusing on learning and improvement rather than letter grades. Sanborn High School also approaches grading more qualitatively. However, these systems remain in the minority due to scalability challenges and the need for standardized evaluation methods.