Weighted Grade Calculator

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weighted grade calculator
Calculate Weighted Average GradeCalculate Final Grade Needed
Assessment / Category
Grade (%)
Weight (%)
Result:
function toggleInputs(){var mode=document.getElementById('calc_mode').value;if(mode==='average'){document.getElementById('averageInputs').style.display='block';document.getElementById('finalInputs').style.display='none';}else{document.getElementById('averageInputs').style.display='none';document.getElementById('finalInputs').style.display='block';}document.getElementById('answer').style.display='none';}function calculateGrade(){var mode=document.getElementById('calc_mode').value;var showSteps=document.getElementById('steps').checked;var ansDiv=document.getElementById('answer');ansDiv.innerHTML=";if(mode==='average'){var totalWeighted=0;var totalWeight=0;var outputSteps=";for(var i=1;i<=5;i++){var g=parseFloat(document.getElementById('g'+i).value);var w=parseFloat(document.getElementById('w'+i).value);if(!isNaN(g)&&!isNaN(w)){totalWeighted+=(g*(w/100));totalWeight+=w;if(showSteps){outputSteps+='Row '+i+': ('+g+' % × '+(w/100)+') = '+(g*(w/100)).toFixed(2)+'
';}}}if(totalWeight===0){alert('Please enter at least one grade and weight.');return;}var finalAvg=(totalWeighted/(totalWeight/100));ansDiv.innerHTML=''+finalAvg.toFixed(2)+'%
';if(showSteps){ansDiv.innerHTML+='
Steps:
'+outputSteps+'Total Weighted Sum: '+totalWeighted.toFixed(2)+'
Total Weight: '+totalWeight.toFixed(2)+'%
Final = ('+totalWeighted.toFixed(2)+' / '+(totalWeight/100).toFixed(2)+')
';}}else{var cur=parseFloat(document.getElementById('current_grade').value);var tar=parseFloat(document.getElementById('target_grade').value);var fw=parseFloat(document.getElementById('final_weight').value);if(isNaN(cur)||isNaN(tar)||isNaN(fw)){alert('Please fill in all target grade fields');return;}var needed=((tar-(cur*((100-fw)/100)))/(fw/100));ansDiv.innerHTML='Grade needed on final exam:
'+needed.toFixed(2)+'%';if(showSteps){ansDiv.innerHTML+='
Steps:
1. Current Contribution: '+cur+' × '+((100-fw)/100)+'% = '+(cur*((100-fw)/100)).toFixed(2)+'
2. Needed from Final: '+tar+' – '+(cur*((100-fw)/100)).toFixed(2)+' = '+(tar-(cur*((100-fw)/100))).toFixed(2)+'
3. Final Grade Required: '+(tar-(cur*((100-fw)/100))).toFixed(2)+' / '+(fw/100)+' = '+needed.toFixed(2)+'%
';}}ansDiv.style.display='block';}

Calculator Use

The weighted grade calculator is a powerful tool designed for students and educators to determine a final course grade based on different assessment categories. In many academic settings, not all assignments carry the same weight; for instance, a final exam might be worth 40% of your grade, while homework only counts for 10%.

This calculator allows you to input multiple categories, their corresponding grades, and their weight toward the total. It also features a "Final Grade Needed" mode, which helps you reverse-engineer what score you need on your last exam to reach a specific goal.

Assessment / Category
The name of the assignment type (e.g., Quizzes, Midterm, Participation).
Grade (%)
The actual percentage score you received on that assessment.
Weight (%)
The relative importance of the category in the final grade calculation (usually provided in the course syllabus).

How It Works

A weighted grade is calculated by multiplying each grade by its weight and then summing those products together. If the weights do not sum to 100%, the result is normalized by dividing the total points by the total weights used.

Weighted Grade = (G1 × W1 + G2 × W2 + … + Gn × Wn) / (W1 + W2 + … + Wn)

  • G = Individual grade percentage
  • W = Weight of that category
  • n = Number of categories

Calculation Example

Example Scenario: Imagine a college course with three categories: Homework (20%), Midterm (30%), and a Final Project (50%). You scored 90% on homework, 75% on the midterm, and 85% on the project.

Step-by-step solution:

  1. Multiply Grade 1 by Weight 1: 90 × 0.20 = 18.0
  2. Multiply Grade 2 by Weight 2: 75 × 0.30 = 22.5
  3. Multiply Grade 3 by Weight 3: 85 × 0.50 = 42.5
  4. Sum the results: 18.0 + 22.5 + 42.5 = 83.0
  5. Final Weighted Grade = 83.0% (assuming weights total 100%)

Common Questions

What happens if my weights don't add up to 100%?

Our weighted grade calculator automatically adjusts. It divides the weighted sum by the total weight you provided. For example, if you have only completed 60% of the course material, it will calculate your current grade relative to that 60%.

What is the difference between a simple average and a weighted average?

A simple average treats every assignment as having equal value. A weighted average recognizes that some assignments (like a final exam) are more significant than others (like a daily quiz) and should impact the overall grade more heavily.

How do I calculate what I need on my final exam?

Select "Calculate Final Grade Needed" in the dropdown above. Input your current overall grade and the weight of the final exam. The calculator will tell you exactly what score you need to reach your target grade for the semester.

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