Attendance Percentage Calculator
Leave at zero if the course has finished.
The minimum you have to meet.
Attendance so far
80%
32 of 40 sessions held, with 12 still to come
- Sessions you can still miss5
- Sessions you must still attend7
- Ending rate if you attend everything left84.6%
- Ending rate if you attend nothing else61.5%
Every session counts the same here, which is the arithmetic rather than a claim about your course. Many institutions weight a laboratory or a seminar more heavily than a lecture, count a late arrival as a half absence, or measure attendance per module rather than across the programme. Count in whatever unit the rule is written in and the answer matches the rule.
The denominator is the argument that actually happens. Authorised absence, illness with a note, a cancelled class, and a session held before you enrolled are each handled differently from place to place: some remove the session from the total, some count it as attended, and some count it against you exactly like any other absence. Ask which of the three applies before working out how much room you have left.
A fraction, and the rule it is measured against
Attendance is sessions attended divided by sessions held, expressed as a percentage. The interesting part is never the division; it is the rule the result is compared with, and the fact that the rule is enforced on whole sessions. You cannot miss four fifths of a lecture. So the practical question is a count — how many more can I skip — and that is the figure this page is built around.
Working out the remaining room
Suppose 32 of the 40 sessions held so far were attended, giving 80 per cent, with twelve still to come and a rule set at 75. Across the whole course that is 52 sessions, and three quarters of 52 is 39, so 39 must be attended in total. Thirty-two are already in hand, seven of the remaining twelve are therefore compulsory, and five can be missed.
Notice how the rule is applied at the end rather than continuously. Being at 80 today says nothing on its own; being able to absorb five more absences does. Eight absences have been taken already and the whole course allows thirteen.
Whole sessions make every rule stricter than it reads
Keep that same 52-session course and change nothing but the rule it is measured against.
| Rule | Must attend | May miss | What the rule really is |
|---|---|---|---|
| 70% | 37 | 15 | 71.2% |
| 75% | 39 | 13 | 75.0% |
| 80% | 42 | 10 | 80.8% |
| 85% | 45 | 7 | 86.5% |
| 90% | 47 | 5 | 90.4% |
| 95% | 50 | 2 | 96.2% |
| 100% | 52 | 0 | 100% |
Only the 75 rule divides evenly into 52. Everywhere else the requirement rounds up to a whole session, so what you are actually held to is the figure in the last column: an 80 per cent rule on this course is an 80.8 per cent rule, and the two-fifths of a session of slack it appears to offer does not exist. How large that gap is depends entirely on the course length, which is the argument for carrying the count of absences around in your head rather than the percentage.
Why a rate that has slipped climbs back slowly
Sessions already held never leave the denominator, so every subsequent absence costs more to undo than the last one did. Someone sitting at 50 per cent after twenty sessions needs twenty more in an unbroken run merely to reach 75, because each new session lifts the top and the bottom of the fraction together. That is why an early run of absences is so much more expensive than it feels at the time.
The limiting case is a rule of 100 per cent, which cannot be recovered at all. One missed session puts it permanently out of reach, and no amount of later attendance repairs the record.
What counts, and what counts as a session
The denominator is where the real disputes happen. Authorised absence, certificated illness, a class cancelled by the institution, and sessions held before you enrolled are each treated differently from place to place — removed from the total, credited as attended, or counted against you exactly like anything else. One policy can make several percentage points of difference.
The unit matters too. Rules are variously written per module, per programme, per term or per week, and a three-hour laboratory may count as one session or as three. Count in whatever unit the rule is expressed in, and check whether lateness is recorded as a partial absence before relying on the room you appear to have.
When the requirement is already out of reach
Do authorised absences count against me?
That depends entirely on local policy, and it is the first thing to establish. Some institutions remove an authorised absence from the total sessions so the fraction is unaffected; others record it as attended; a few count it like any other absence and handle the consequences separately.
What happens if the requirement is already impossible to meet?
The tool says so instead of printing an encouraging number, because attending everything left would still finish below the line. Raise it with the course administrator immediately: outcomes at that point are usually decided by mitigating circumstances procedures rather than by arithmetic.
Why does this ask for sessions rather than just a percentage?
Because the answer worth having is a count, and a percentage cannot produce one. Eighty per cent of a 52-session course allows ten absences; eighty per cent of a 24-session course allows four. Neither figure is recoverable from the rate on its own, so the sessions have to be typed in for the count to fall out.
Is a cancelled class an absence?
Almost never, but it has to come out of the sessions held rather than be counted as one you attended, since it was never held. Reduce the sessions held figure and the percentage takes care of itself.
Does this apply to visa or professional body requirements?
The arithmetic is the same, but those regimes usually define the session, the reporting period and the acceptable evidence far more tightly, and a single breach may be reportable. Work to the written definition you were given rather than to a general rule of thumb.