Attendance Percentage Calculator
Calculation breakdown
How Many Classes Can I Miss?
Calculation breakdown
Attendance Recovery Calculator
Find out exactly how many scheduled classes you need to attend to reach your required attendance percentage.
Recovery breakdown
Attendance Percentage Formula
The attendance percentage formula is simple: Attendance % = (Classes Attended / Total Classes) × 100. For example, if you attended 42 out of 50 classes, your attendance is 84%.
To find how many classes you can still miss: Max absences = Total classes × (1 − Required% / 100). With 60 total classes and 80% required, you can miss at most 12 classes total.
To find how many classes you need to attend to reach a target percentage: Min classes needed = ceil(Required% / 100 × Total classes).
| Required % | Classes you can miss (out of 60) | Must attend (out of 60) |
|---|---|---|
| 75% | 15 absences | 45 classes |
| 80% | 12 absences | 48 classes |
| 85% | 9 absences | 51 classes |
| 90% | 6 absences | 54 classes |
| 95% | 3 absences | 57 classes |
Attendance Requirements by Institution
Attendance requirements vary significantly between countries and institution types. Always verify your specific institution policy.
| Institution type | Typical requirement | Notes |
|---|---|---|
| US colleges (general) | 75–80% | Varies by professor and department |
| UK universities | 80–85% | Mandatory monitoring; visa students: 100% |
| US K-12 schools | 90%+ | Below 80% = chronically absent (federal definition) |
| Indian universities | 75% | UGC mandate — required to sit exams |
| Workplace (US) | Policy-dependent | Usually tracked separately from PTO |
📚 References: US Dept. of Education — Chronic Absenteeism · QAA UK — Student Engagement
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