Attendance Calculator
Work out your attendance percentage and how many classes you can still miss before you drop below the requirement.
You are meeting the 75% requirement. Of the 20 remaining classes you can still miss up to 8 and finish the term at or above 75%.
Your attendance percentage is classes attended ÷ classes held × 100. Attend 18 of 20 classes and you sit at 90%, comfortably above a 75% requirement. Across a 40-class term with 20 classes left, you could still miss up to 8 of them and finish at exactly 75%.
How the attendance calculator works
Attendance is a simple ratio: the number of classes you actually turned up to, divided by the number that have been held so far, expressed as a percentage. This tool takes those two counts and, optionally, the total number of classes scheduled for the whole term, then answers the question every student really cares about — not just where you stand today, but how much slack you have left. If you are already above your course’s minimum, it tells you the maximum number of the remaining classes you can afford to skip. If you have slipped below, it tells you how many of the classes still to come you must attend to climb back to the line, or says honestly when the term’s target is no longer reachable.
required is the threshold as a fraction (75% → 0.75); remaining = total − held. Max misses is clamped between 0 and the number of classes left.
Worked example: 18 of 20, aiming for 75% across a 40-class term
You have attended 18 of the 20 classes held so far and your course requires 75% attendance over all 40 classes in the term.
- 1 Divide attended by held. 18 ÷ 20 = 0.9, so your current attendance is 90%.
- 2 Compare with the requirement. 90% is greater than 75%, so you currently meet the threshold.
- 3 Count the classes left. remaining = total − held = 40 − 20 = 20 classes still to come.
- 4 Apply the max-misses formula. floor(18 + 20 − 0.75 × 40) = floor(38 − 30) = floor(8) = 8.
- 5 Read off the result. You can miss up to 8 of the remaining 20 classes and still finish at 30 ÷ 40 = 75%.
What common attendance targets allow
Maximum classes you can miss across a full term at each threshold, assuming you attend every other session. Attendance policies vary by school and course — always check your own.
| Required | Term of 40 classes | Term of 30 classes | Term of 24 classes |
|---|---|---|---|
| 90% | miss up to 4 | miss up to 3 | miss up to 2 |
| 80% | miss up to 8 | miss up to 6 | miss up to 4 |
| 75% | miss up to 10 | miss up to 7 | miss up to 6 |
| 66% | miss up to 13 | miss up to 10 | miss up to 8 |
Reading the result sensibly
Two cautions. First, the “can still miss” number assumes you attend every class you do not deliberately skip — one unplanned absence eats into the same budget. Second, attendance rules differ enormously between institutions and even between courses at the same school: some count only lectures, some weight seminars or labs, and some treat excused and unexcused absences differently. The calculator works purely from the counts you enter, so if your school excludes certain sessions or forgives medical absences, subtract those before you type the numbers in. Attendance policies vary by school and course — treat this as a planning aid, not the last word from your registrar.