Weighted Average Grade Calculator
A tool for students to calculate their final class grade when assignments carry different weights — like a Final Exam worth 50% and Homework worth 10%.
Enter your grades and their percentage weights to see exactly where you stand in class.
Current average
84.00%
Based on 70% of the coursework completed
Total weight
70%
30% of the course remains
Letter grade
B
Standard 10-point scale
Assignments counted
3
0 ignored (invalid or empty)
Weights do not add to 100%? That is fine — the calculator treats your completed work as the full picture so far and adjusts as you add more.
Current %
84.00
Filled automatically
e.g. 90 for an A
What the final is worth
You would need 104.0% on the final
Not reachable with the final alone — the final is only 30% of the grade. Aim for a lower target or line up extra credit.
About this calculator
Keeping grades on top gets stressful when different assignments carry different weights. A simple average fails you when a Final Exam is worth 40% and Homework is worth only 5% — in a weighted grading system, some assignments simply affect your final grade more than others.
Imagine two grades: Homework 100% (worth 10% of the class) and Midterm 70% (worth 90%). The simple average says (100 + 70) ÷ 2 = 85% — looks like a B. The weighted average says (100 × 0.10) + (70 × 0.90) = 73% — actually a C. The weighted average is the accurate one, because the midterm carries the weight.
Formula
Weighted Grade = Σ(Score × Weight) ÷ ΣWeights
How to use it
- 1
Add assignments: enter the assignment name if you want, then your grade (%) and its weight (%).
- 2
Ignore the total for now: your weights do not need to equal 100% yet. If you have completed only 30% of the coursework, the calculator averages that 30% — your finished work is the full picture so far.
- 3
Read the result: Current Average shows your class grade on completed work, with your letter grade alongside.
- 4
Use the Final Exam Planner: your current average fills in automatically — enter your target grade (e.g. 90 for an A) and the final exam's weight, and the planner shows the minimum score you need on the final.
Example: the built-in sample
Homeworks 88 (20%), Midterm 76 (30%) and Lab Project 92 (20%) — 70% of the course done — give a current average of 84.00%, a B. Press Reset above to load these exact numbers, then try the Final Exam Planner with target 90% and final weight 30%.
In Excel: In Excel use =SUMPRODUCT(grades, weights) / SUM(weights).
Frequently asked questions
What if my weights don't add up to 100%?
That is normal — your semester may still be in progress and completed work may only cover 60% or 70% so far. The calculator adjusts the average based on your finished work and treats it as the full progress right now. Add assignments as they arrive and the picture updates.
What if I need more than 100% on the final?
If the planner shows something like 105%, you cannot reach that target with the final exam alone. Line up extra credit, or set a lower target — a B+ instead of an A, for example. The planner tells you this honestly so you can plan realistically.
Can I use points instead of percentages?
Yes — just stay consistent across your entries. For example, 45 points out of 50 equals 90%, so you can enter either the percentage directly or convert your points first. Both work with the same weighted formula.
What is the difference between average and weighted average?
A simple average gives every assignment equal value. A weighted average gives more value to some assignments — exams usually count more than homework. Most schools use weighted averages for final grades, which is why this calculator exists.