Attendance Percentage Calculator
Work out your attendance, and how many classes you need or can miss.
How to calculate attendance percentage
Attendance % = classes attended ÷ classes held × 100. Attending 30 of 40 classes is 75%. Many schools, colleges and universities set a minimum, often 75%, but the rule differs, so check yours.
How many classes do I need to attend to reach 75%?
If you attend x classes in a row, your attendance becomes (attended + x) ÷ (held + x). To reach 75%, you need x ≥ (0.75 × held − attended) ÷ 0.25.
| Attended | Attendance now | Classes needed in a row |
|---|---|---|
| 20 of 40 | 50.0% | 40 |
| 24 of 40 | 60.0% | 24 |
| 28 of 40 | 70.0% | 8 |
| 29 of 40 | 72.5% | 4 |
How many classes can I miss?
If you are above the requirement, the number of further classes you can miss is floor(attended ÷ 0.75 − held). It assumes you attend none of the next classes.
| Attended | Attendance now | Further classes you can miss |
|---|---|---|
| 34 of 40 | 85.0% | 5 |
| 36 of 40 | 90.0% | 8 |
| 38 of 40 | 95.0% | 10 |
Planning a whole term
The “Plan for the term” tab works from the total number of classes in the term. With 120 classes in total, 60 held and 48 attended, you need 90 attended in all for 75%, so you must attend 42 of the 60 remaining classes and can miss 18.
Use this as a guide, and follow your institution’s official attendance record.
Frequently asked questions
How do I calculate attendance percentage?
Divide the classes attended by the classes held and multiply by 100.
How many classes do I need to attend to get 75% attendance?
Use x = (0.75 × held − attended) ÷ 0.25. If you have attended 28 of 40 classes, you must attend the next 8 in a row.
How many classes can I miss?
If your attendance is above 75%, you can miss floor(attended ÷ 0.75 − held) more classes. With 36 of 40 attended, you can miss 8.
Is 75% attendance compulsory?
Many institutions require 75%, and some require 80% or more. Your own institution's rules decide.
Does medical leave count?
That depends on your institution. Some give a condonation for medical leave. Check the rules or ask the administration.
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