Attendance Calculator
Find how many classes you need to attend to reach a target such as 75% or 80%. Add remaining classes to see whether the target is still reachable this term.
How to use it
Enter classes held and attended, then choose the required percentage. Add remaining classes if known. Calculate each subject separately: an overall average can hide a shortage in an individual subject.
Attendance recovery formula
Let A be attended classes, H classes held and t the target as a decimal, for example 0.75. Current attendance is 100 × A/H. For t below 1, consecutive classes needed = max(0, ceiling((tH − A)/(1 − t))).
If R classes remain, the minimum to attend is max(0, ceiling(t(H + R) − A)). If that exceeds R, the target cannot be reached this term. Classes you can miss now while staying at the target = max(0, floor(A/t − H)).
A 100% target can only be maintained if no class has been missed; it cannot be recovered after an absence. With no classes held, the current percentage is undefined rather than zero.
Useful example
With 30 of 50 classes attended and a 75% target, you need 30 consecutive attended classes: (30 + 30) ÷ (50 + 30) = 75%. If only 20 classes remain, even attending all of them gives 50 ÷ 70 ≈ 71.43%, so 75% is not reachable on those inputs.
Tips
Results use exact count thresholds; displayed percentages are rounded to two decimals and do not decide eligibility. Targets, excused absences, cancelled classes and rounding policies vary by institution. This tool is planning arithmetic, not official attendance certification.
Frequently asked questions
Is 75% required at every college?
No. Enter the rule that applies to your course. This tool does not determine your institution’s attendance policy or exemptions.
What if I do not know how many classes remain?
Leave Remaining blank. You will still see current attendance, consecutive classes needed and how many classes you can miss immediately. End-of-term feasibility needs a remaining count.
Does 74.995% count as 75% here?
No. Eligibility calculations use the underlying counts and target, not the percentage rounded for display. Ask your institution whether it applies a different rounding rule.
Can I combine several subjects?
Add up to 12 subjects. Each is checked independently, without implying that a high attendance in one subject compensates for a shortage in another.
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