Letter Grade Calculator
Enter Your Scores
Add your assignment scores and weights above to see your letter grade, GPA equivalent, and weighted average.
How to Use This Calculator
Select a Calculator Mode
Choose from three tabs: Weighted Grades for calculating your course average across multiple assignments, EZ Grader for quickly converting a test's wrong-answer count to a grade, or Final Exam Planner to find out what score you need on your upcoming final.
Enter Your Scores and Weights
In Weighted Grades mode, type each assignment name, its score (as a percentage, letter grade, or points earned/total), and its weight as a percentage of the total grade. You do not need to make weights sum to 100 — the calculator normalises them automatically. Add extra rows for more assignments.
Review Your Letter Grade and GPA
Results appear automatically as you type. Your overall grade, letter grade (A+ through F), and GPA equivalent on the 4.33 scale are shown instantly. The per-assignment breakdown bars show each item's weighted contribution so you can see which assignments are dragging your grade down.
Use the Final Exam Planner
Switch to the Final Exam Planner tab and enter your current course grade, the exam's weight percentage, and your target overall grade. The calculator tells you exactly what score you need — and flags it as infeasible with a warning if the required score exceeds 100%.
Frequently Asked Questions
How do I calculate a weighted grade average?
A weighted grade average is calculated by multiplying each assignment's score by its weight, summing those products, and dividing by the total weight. For example, if your homework (weight 20%) scored 75%, your midterm (weight 40%) scored 82%, and your final (weight 40%) scored 90%, the weighted average is (75×20 + 82×40 + 90×40) ÷ (20+40+40) = (1500 + 3280 + 3600) ÷ 100 = 83.8%, which is a B. This calculator handles the math instantly — just enter scores and weights in the Weighted Grades tab.
What letter grade is 70%, 75%, 80%, 85%, or 90%?
Using the standard US grading scale: 70–72% is a C-, 73–76% is a C, 77–79% is a C+, 80–82% is a B-, 83–86% is a B, 87–89% is a B+, and 90–92% is an A-. So 70% = C-, 75% = C, 80% = B-, 85% = B, and 90% = A-. Scores at 93% and above reach A territory, with A+ reserved for 97–100%. These thresholds are standard across most US high schools and colleges, but always check your syllabus for any custom cutoffs your instructor might use.
What GPA is an A, B, C, D, or F?
On the 4.33 scale used by many universities: A+ = 4.3, 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, and F = 0.0. Some schools use a strict 4.0 scale where A+ and A both equal 4.0. To calculate your cumulative GPA, multiply each course's GPA value by the number of credit hours, sum those products, and divide by total credit hours. This calculator shows the GPA equivalent for each grade result automatically.
What does the EZ Grader mode do?
The EZ Grader mode is a quick tool for teachers and students to grade a test by counting wrong answers. Enter the total number of questions and the number of answers a student got wrong, and the calculator instantly shows the percentage score and letter grade. You can also enable the full grading chart, which displays every possible wrong-answer count (from 0 to the total) alongside the resulting percentage and letter grade. This is especially useful when grading a class set of papers — you can look up any student's score in seconds.
How do I find out what I need on my final exam?
Use the Final Exam Planner tab. Enter your current overall course grade (the grade you have right now, before the final), the final exam's weight as a percentage of the total course grade, and the target grade you want to achieve overall. The calculator solves for the required final exam score using the formula: Required = (Target − Current × (1 − FinalWeight/100)) ÷ (FinalWeight/100). If the result is over 100%, a warning appears indicating the target is mathematically out of reach. If it is below 0%, you have already secured your target regardless of what you score.
What is the drop-lowest-score feature?
Many courses let students drop their lowest quiz or assignment grade at the end of the semester, which is intended to give some flexibility for a single bad day. The 'Drop Lowest N Scores' field in the Weighted Grades tab lets you simulate this policy. Enter how many of the lowest-scoring rows you want to exclude, and the calculator automatically removes them before computing the weighted average. For example, if you have five quiz grades and your professor drops the lowest one, set this field to 1, and the tool will discard your weakest quiz when calculating your final grade.