`;
tbody.appendChild(newRow);
}
// Remove row from grades table
function removeRow(button) {
const row = button.closest(‘tr’);
if (document.querySelectorAll(‘.grade-row’).length > 1) {
row.remove();
} else {
// Clear inputs instead of removing the last row
row.querySelector(‘.assignment-name’).value = ”;
row.querySelector(‘.assignment-grade’).value = ”;
row.querySelector(‘.assignment-weight’).value = ”;
}
}
// Convert input grade to percentage
function parseGrade(grade) {
if (!grade) return NaN;
// Check if letter grade
const letterGrade = grade.toUpperCase();
if (gradeScale.hasOwnProperty(letterGrade)) {
return gradeScale[letterGrade];
}
// Parse as number
const numericGrade = parseFloat(grade);
if (!isNaN(numericGrade)) {
return numericGrade;
}
return NaN;
}
// Calculate current grade
function calculateCurrentGrade() {
try {
const rows = document.querySelectorAll(‘.grade-row’);
let totalWeight = 0;
let weightedSum = 0;
rows.forEach(row => {
const gradeInput = row.querySelector(‘.assignment-grade’).value;
const weight = parseFloat(row.querySelector(‘.assignment-weight’).value);
if (isNaN(weight) || weight <= 0) {
throw new Error('Please enter valid weights for all assignments');
}
const grade = parseGrade(gradeInput);
if (isNaN(grade)) {
throw new Error('Please enter valid grades for all assignments');
}
totalWeight += weight;
weightedSum += (grade * weight);
});
if (totalWeight === 0) {
throw new Error('Please enter at least one assignment with weight');
}
const currentGrade = weightedSum / totalWeight;
// Display results
document.getElementById('current-grade').textContent = currentGrade.toFixed(2) + '%';
document.getElementById('total-weight').textContent = totalWeight + '%';
document.getElementById('current-grade-results').style.display = 'block';
document.getElementById('error-message').style.display = 'none';
} catch (error) {
showError(error.message);
document.getElementById('current-grade-results').style.display = 'none';
}
}
// Calculate grade needed on remaining tasks
function calculateGradeNeeded() {
try {
const goal = parseFloat(document.getElementById('final-grade-goal').value);
const remainingWeight = parseFloat(document.getElementById('remaining-weight').value);
if (isNaN(goal) || goal 100) {
throw new Error(‘Please enter a valid final grade goal (0-100)’);
}
if (isNaN(remainingWeight) || remainingWeight 100) {
throw new Error(‘Please enter valid weight for remaining tasks (0-100)’);
}
// Get current grade if calculated
let currentGrade = 0;
let currentWeight = 0;
const currentGradeDisplay = document.getElementById(‘current-grade’).textContent;
if (currentGradeDisplay && document.getElementById(‘current-grade-results’).style.display !== ‘none’) {
currentGrade = parseFloat(currentGradeDisplay);
currentWeight = parseFloat(document.getElementById(‘total-weight’).textContent);
}
if (currentWeight + remainingWeight > 100) {
throw new Error(‘Total weight cannot exceed 100%’);
}
const gradeNeeded = (goal * 100 – currentGrade * currentWeight) / remainingWeight;
// Display results
document.getElementById(‘grade-needed’).textContent = gradeNeeded.toFixed(2) + ‘%’;
document.getElementById(‘planning-results’).style.display = ‘block’;
document.getElementById(‘error-message’).style.display = ‘none’;
} catch (error) {
showError(error.message);
document.getElementById(‘planning-results’).style.display = ‘none’;
}
}
// Calculate final exam grade needed
function calculateFinalExamGrade() {
try {
const currentGrade = parseFloat(document.getElementById(‘current-grade-input’).value);
const desiredGrade = parseFloat(document.getElementById(‘desired-grade’).value);
const finalWeight = parseFloat(document.getElementById(‘final-weight’).value);
if (isNaN(currentGrade) || currentGrade 100) {
throw new Error(‘Please enter a valid current grade (0-100)’);
}
if (isNaN(desiredGrade) || desiredGrade 100) {
throw new Error(‘Please enter a valid desired grade (0-100)’);
}
if (isNaN(finalWeight) || finalWeight 100) {
throw new Error(‘Please enter valid final exam weight (0-100)’);
}
const currentWeight = 100 – finalWeight;
const finalExamGrade = (desiredGrade * 100 – currentGrade * currentWeight) / finalWeight;
// Display results
let resultText;
if (finalExamGrade > 100) {
resultText = `Impossible (need ${finalExamGrade.toFixed(2)}%) – Set a lower target grade`;
} else if (finalExamGrade < 0) {
resultText = `0% (you can fail the final and still get ${desiredGrade}%)`;
} else {
resultText = finalExamGrade.toFixed(2) + '%';
}
document.getElementById('final-exam-grade').textContent = resultText;
document.getElementById('final-exam-results').style.display = 'block';
document.getElementById('error-message').style.display = 'none';
} catch (error) {
showError(error.message);
document.getElementById('final-exam-results').style.display = 'none';
}
}
function showError(message) {
document.getElementById('error-message').textContent = message;
document.getElementById('error-message').style.display = 'block';
}
// Initialize with 3 rows
document.addEventListener('DOMContentLoaded', function() {
addRow();
addRow();
});
A Brief History of Different Grading Systems
Grading systems have evolved significantly over time, and their development has been shaped by varying institutional needs and philosophies. The history of grading reflects a shift from subjective, arbitrary measures to more standardized systems, though inconsistency remains in modern-day grading practices.
Early Grading Systems
In 1785, Yale University used a ranking system that categorized students based on their performance, such as “optimi” for the best students and “pejores” for the worst. Similarly, at William and Mary, students were ranked as either No. 1 or No. 2, with No. 1 representing top students and No. 2 indicating those who were orderly and attentive but not necessarily at the top academically. At Harvard University, a numerical grading system was used, ranging from 1 to 200 for most subjects, and 1 to 100 for math and philosophy. These early grading systems were often inconsistent and arbitrary, highlighting the need for a more standardized system.
The Emergence of Letter Grades
In 1887, Mount Holyoke College became the first institution to adopt a letter grading system similar to what is commonly used today. Initially, it used the letters A, B, C, D, and E, with E representing a failing grade. However, this system was stricter than today’s standards, where anything below 75% was considered a failure. Eventually, the system was modified, and F was introduced as the failing grade. This letter grading system spread across colleges and high schools, leading to its widespread adoption. Despite this, variations exist, such as whether to include pluses or minuses (e.g., A+ or B-), creating some inconsistencies across institutions.
Alternatives to the Letter Grading System
While the letter grading system is widely used, it is not without criticism. Critics argue that letter grades oversimplify student performance, especially in subjective assessments like essays or projects, where a simple grade may not provide enough meaningful feedback. Some educators have explored alternatives that emphasize qualitative feedback over quantitative evaluations.
One such example is Saint Ann’s School in New York City, an arts-oriented private school that doesn’t use letter grades. Instead, teachers write detailed, anecdotal reports for each student, focusing on their progress, learning, and areas for improvement. This approach is intended to foster a deeper understanding of the subject matter and encourage personal growth rather than simply pursuing a letter grade. However, this system requires significant time investment from teachers and may not be practical for larger schools or universities with hundreds of students per course.
Some schools, like Sanborn High School, also use more qualitative grading methods, but these alternatives remain relatively rare compared to the letter grading system. Though the approach might be beneficial in some contexts, its scalability is a significant challenge, particularly in large educational institutions.
The Future of Grading
Despite the potential benefits of more qualitative evaluations, the letter grading system remains the standard in most educational settings due to its simplicity and scalability. However, many educators are increasingly looking for ways to minimize the emphasis on grades, focusing more on promoting learning and improvement. A balanced approach that combines the strengths of both qualitative feedback and standardized grading may be the key to providing effective, comprehensive evaluations of student performance.
While the letter grading system is unlikely to be completely replaced in the near future, the ongoing exploration of alternative grading methods highlights a growing interest in improving how we assess and motivate students.