The attendance calculator works in three simple steps:

1. Enter the total number of classes conducted
2. Enter the number of classes you've attended
3. Select your target attendance percentage (75%, 80%, 85%, or 90%)

The calculator then shows your current attendance percentage and tells you how many more classes you need to attend or can afford to miss.

75% attendance is typically the minimum requirement in most educational institutions because:

• It's often mandated by educational boards and universities
• Ensures regular participation in academic activities
• Required to be eligible for examinations
• Helps maintain academic discipline and learning continuity

The formula used to calculate required classes is:

Classes Needed = [(Target% × Total Classes) - (100 × Attended Classes)] ÷ (100 - Target%)

This calculation ensures you know exactly how many more classes you need to attend to reach your target percentage.

This number indicates how many upcoming classes you can afford to miss while still maintaining your target attendance percentage. It's calculated using:

Classes You Can Miss = (Attended × 100 ÷ Target%) - Total Classes

A negative number means you need to attend more classes to reach your target.

The calculator provides preset target percentages of:

• 75% - Minimum requirement in most institutions
• 80% - Higher safety margin
• 85% - Excellent attendance level
• 90% - Outstanding attendance record

These cover most common scenarios in educational institutions.