Errors: "+v2+"
Correct: "+(v1-v2)+"
Formula: (Correct/Total) * Scale";}else if(mode==='correct'){score=(v2/v1)*v3;resultText="Score Percentage";stepsHTML="Total: "+v1+"
Correct: "+v2+"
Formula: (Correct/Total) * Scale";}else if(mode==='target'){score=Math.floor(v1-(v1*(v2/100)));resultText="Allowed Errors";stepsHTML="Total: "+v1+"
Target: "+v2+"%
Minimum Correct: "+Math.ceil(v1*(v2/100));}if(mode!=='target'){if(score>=90)letter="A";else if(score>=80)letter="B";else if(score>=70)letter="C";else if(score>=60)letter="D";else letter="F";document.getElementById('gradeValue').innerHTML="Grade: "+letter;document.getElementById('resultValue').innerHTML=score.toFixed(2)+(v3===100?"%":" points");}else{document.getElementById('resultValue').innerHTML=score;document.getElementById('gradeValue').innerHTML="Incorrect Answers Max"; }document.getElementById('resultLabel').innerHTML=resultText;if(showSteps){document.getElementById('stepsOutput').innerHTML="Calculation Details:
"+stepsHTML;document.getElementById('stepsOutput').style.display='block';}else{document.getElementById('stepsOutput').style.display='none';}}
How to Use the Test Score Calculator
A test score calculator is an essential tool for students, teachers, and parents to quickly determine an exam grade based on the number of questions and errors. Whether you are grading a stack of midterms or checking your own performance on a quiz, this tool provides instant accuracy.
To get started, simply choose your calculation method from the dropdown menu and follow these steps:
- Number of Questions
- Enter the total number of items or questions present on the exam or assignment.
- Number of Errors / Correct
- Enter how many questions were answered incorrectly (Errors) or correctly, depending on the mode selected.
- Scale (Max Points)
- The default is 100 for a percentage, but you can change this to match a specific point system (e.g., 50 points or 200 points).
How the Test Score is Calculated
The math behind the test score calculator is straightforward. The primary goal is to find the ratio of correct answers to the total number of questions. The standard formula used is:
Score Percentage = (Total Questions – Number of Errors) / Total Questions × 100
For example, if you have a 40-question test and you got 4 wrong:
- Correct Answers: 40 – 4 = 36
- Division: 36 / 40 = 0.90
- Percentage: 0.90 × 100 = 90%
Standard Grading Scale
Once the percentage is calculated, it is often mapped to a letter grade. Most schools in the United States use a standard 10-point grading scale:
| Percentage | Letter Grade |
|---|---|
| 90% – 100% | A |
| 80% – 89% | B |
| 70% – 79% | C |
| 60% – 69% | D |
| Below 60% | F |
Calculation Example
Example: A student takes a science quiz with 25 total questions. After grading, the teacher notes that the student missed 3 questions. What is the score?
Step-by-step solution:
- Total Questions = 25
- Number of Errors = 3
- Find Correct Answers: 25 – 3 = 22
- Divide Correct by Total: 22 / 25 = 0.88
- Convert to Percentage: 0.88 × 100 = 88%
- Result = 88% (Grade: B)
Common Grading Questions
What is a "Curve" in Grading?
A curve is a method used by teachers to adjust student scores based on the overall performance of the class. If a test was particularly difficult and the highest score was only an 80%, a teacher might "curve" the scores by adding 20 points to everyone's result so the top student receives a 100%.
Is 70% a passing grade?
In most academic institutions, a 70% is considered a "C" and is a passing grade. However, some professional certifications or advanced university courses may require a minimum of 75% or 80% to pass.
How do you calculate a weighted grade?
Weighted grades involve multiplying the score by the weight of the assignment. For example, if a test is worth 40% of your grade and you scored 90%, it contributes 36 points (0.40 * 90) to your final grade average. Use our test score calculator to find the raw percentage first, then apply it to your weighted syllabus.