Final Grade Calculator

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Final Grade Calculator
What grade do I need on my final exam?What is my current weighted grade?

Enter your category scores and their respective weights.

Category Name
Grade (%)
Weight (%)
Answer:
Enter values to see your result.
function toggleInputs(){var type=document.getElementById('calc_type').value;if(type=='needed'){document.getElementById('neededInputs').style.display='table';document.getElementById('currentInputs').style.display='none';}else{document.getElementById('neededInputs').style.display='none';document.getElementById('currentInputs').style.display='block';}}function calculateFinalGrade(){var type=document.getElementById('calc_type').value;var showSteps=document.getElementById('steps').checked;var ans=document.getElementById('answer');if(type=='needed'){var cur=parseFloat(document.getElementById('current_grade').value);var tar=parseFloat(document.getElementById('target_grade').value);var wgh=parseFloat(document.getElementById('final_weight').value);if(isNaN(cur)||isNaN(tar)||isNaN(wgh)){ans.innerHTML='Please enter valid numbers for current grade, target, and weight.';return;}var wDec=wgh/100;var req=((tar-(cur*(1-wDec)))/wDec);var resultHtml='
You need a '+req.toFixed(2)+'% on your final exam.
';if(showSteps){resultHtml+='
Steps:
1. Remainder of grade: 100% – '+wgh+'% = '+(100-wgh)+'%
2. Current contribution: '+cur+'% × '+((100-wgh)/100)+' = '+(cur*(1-wDec)).toFixed(2)+'%
3. Points needed: '+tar+'% – '+(cur*(1-wDec)).toFixed(2)+'% = '+(tar-(cur*(1-wDec))).toFixed(2)+'%
4. Divide by weight: '+(tar-(cur*(1-wDec))).toFixed(2)+'% / '+(wDec)+' = '+req.toFixed(2)+'%
';}if(req>100){resultHtml+='

Note: You need over 100% to achieve this goal.

';}ans.innerHTML=resultHtml;}else{var g1=parseFloat(document.getElementById('g1').value)||0;var w1=parseFloat(document.getElementById('w1').value)||0;var g2=parseFloat(document.getElementById('g2').value)||0;var w2=parseFloat(document.getElementById('w2').value)||0;var g3=parseFloat(document.getElementById('g3').value)||0;var w3=parseFloat(document.getElementById('w3').value)||0;var g4=parseFloat(document.getElementById('g4').value)||0;var w4=parseFloat(document.getElementById('w4′).value)||0;var totalW=w1+w2+w3+w4;if(totalW===0){ans.innerHTML='Please enter weights.';return;}var weightedSum=(g1*(w1/100))+(g2*(w2/100))+(g3*(w3/100))+(g4*(w4/100));var currentGrade=(weightedSum/(totalW/100));var resultHtml='
Your current grade is '+currentGrade.toFixed(2)+'%
';if(showSteps){resultHtml+='
Steps:
Sum of (Grade × Weight): '+(weightedSum).toFixed(2)+'
Total Weight: '+totalW+'%
Calculation: ('+(weightedSum).toFixed(2)+' / '+totalW+') × 100 = '+currentGrade.toFixed(2)+'%
';}ans.innerHTML=resultHtml;}}

How to Use the Final Grade Calculator

The final grade calculator is a specialized tool designed for students to manage their academic performance and reduce exam-season stress. By calculating exactly what score you need on your final exam to achieve a specific letter grade, you can prioritize your study time effectively.

To use this tool, you simply need three pieces of information:

Current Grade (%)
Your average in the class right now, before the final exam is factored in.
Desired Class Grade (%)
The final overall grade you are aiming for (e.g., 90% for an A, 80% for a B).
Final Exam Weight (%)
What percentage of your total course grade the final exam represents (found in your syllabus).

The Final Grade Formula

The final grade calculator uses a standard weighted average formula. If you want to calculate the required score yourself, use the following algebraic expression:

Required = [Target – (Current × (1 – Weight))] / Weight

  • Target: The overall grade you want.
  • Current: Your current standing in the class.
  • Weight: The weight of the final exam (expressed as a decimal, e.g., 20% = 0.20).

Calculation Example

Example: Sarah has an 87% in her Chemistry class. Her final exam is worth 25% of the total grade. She wants to finish the class with at least a 90% (an A-).

Step-by-step solution:

  1. Current Grade = 87% (0.87)
  2. Target Grade = 90% (0.90)
  3. Final Weight = 25% (0.25)
  4. Calculate the non-final portion: 87 × (1 – 0.25) = 87 × 0.75 = 65.25
  5. Remaining points needed: 90 – 65.25 = 24.75
  6. Required final score: 24.75 / 0.25 = 99%
  7. Result: Sarah needs a 99% on her final to get a 90% in the class.

Common Questions

What if the final grade calculator says I need over 100%?

This means that even with a perfect score on the final exam, your current average is too low to reach your target grade based on the exam's weight. You may need to check if there is extra credit available or lower your target grade.

How do I calculate my current grade if it's weighted?

Switch the calculator to the "Current weighted grade" option. Enter your scores for categories like Homework, Quizzes, and Tests along with their weights. The tool will calculate your current standing by multiplying each score by its weight and dividing by the total weight entered.

Can this calculator handle "points" instead of percentages?

If your class uses a total points system, the math is simpler. Subtract your current earned points from the total points required for your target grade. The result is the number of points you need on the final.

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