Attendance Calculator
Enter the total number of classes in your course, how many you've missed so far, and your required attendance percentage, to see your current attendance rate and how many more absences you can afford.
How the Attendance formula works
Current rate, and the remaining allowance:
Attendance% = ((Total classes − Missed so far) / Total classes) × 100 Max total misses allowed = floor( Total classes × (1 − Required% / 100) ) Remaining misses = Max total misses allowed − Missed so far
Step-by-step calculation
- Subtract classes missed so far from total classes to find classes attended.
- Divide by total classes to get your current attendance percentage.
- Calculate the maximum total absences allowed under your required attendance threshold.
- Subtract absences you've already used from that maximum to see how many you have left.
Worked example
A course with 40 total class sessions, 3 missed so far, requiring 85% attendance: Current attendance = (40−3)/40 × 100 = 92.5%. Max total misses allowed = floor(40 × 0.15) = 6. Remaining misses = 6 − 3 = 3 more classes.
Frequently asked questions
Does this account for excused absences differently?
No — this calculator treats every missed class the same. If your school distinguishes excused from unexcused absences, only count unexcused ones (or whichever category counts against your attendance policy).
What if the total number of classes isn't finalized yet?
Use your best estimate for total classes in the term (check your syllabus for the class meeting schedule) — the calculation updates instantly if that number changes.