Attendance Calculator
Your current attendance, the classes you can still miss, and the run of classes needed to recover — all against the percentage you enter.
Use the percentage your own course outline requires.
Enter classes held, classes attended and the required percentage.
Estimates assume every future class carries the same weight in your university’s calculation. Check your course outline for the rule that applies to you.
Estimates for planning only. Your university's own rules and records are the final authority.
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How this calculator works
Attendance policies are as varied as universities themselves: some require a high percentage formally, others apply softer classroom rules, and plenty sit in between. That variety is exactly why this calculator asks for the requirement instead of assuming it. Enter the percentage that applies to your course, the classes held so far and how many you attended — the tool answers the two questions students actually have: how many can I still miss? and what does it take to recover?
The maths, without hand-waving
Attendance as fractions
Current = attended ÷ held × 100
Can miss k more: attended ÷ (held + k) ≥ requirement
Attend m to recover: (attended + m) ÷ (held + m) ≥ requirement
Both future-events formulas are solved algebraically. Missing k classes lowers the fraction, so the largest safe k is the point where attendance exactly touches the requirement. Attending m classes raises it, with diminishing gains — each new class is one more attended in a growing total.
Two worked examples
Comfortably above. Thirty classes held, twenty-seven attended: 90%. With an 80% requirement, missing three more classes still leaves 27 ÷ 33 = 81.8% — so the tool reports “3” — while a fourth would drop you to 79.4%.
Behind the pace. Thirty held, twenty-two attended: 73.3%, against an 80% requirement. Solving for m: you need ten consecutive attended classes to cross back over the line, since 32 ÷ 40 = 80%. The longer you wait, the larger m grows — recovery gets harder with every class that passes.
Using it well
- Update it weekly. Two numbers per course — held and attended — keep the picture accurate without any spreadsheet gymnastics.
- Ask before relying on a number. If your course outline mentions medical concessions, condoned absences or aggregate rules, those change the arithmetic in ways no generic calculator can see.
- Treat results as projections. The maths is exact for equal-weight classes and an approximation otherwise — a reasonable planning lens, not an official record.
Why a neutral tool says less
You will notice the calculator never tells you what the minimum attendance “should” be, and never guesses your university’s rule. That is deliberate: rules differ, change between courses, and are published by your institution — not by us. nuSkor supplies the arithmetic; you supply the policy. Estimates for planning only; official records always win.