Processed entirely on your device — nothing is uploaded
How to use the attendance calculator
- 1Enter how many classes you have attended and how many have been held so far.
- 2Set the required percentage — 75% is the usual university minimum.
- 3If you are above the line, read how many classes you can still miss.
- 4If you are below it, read how many consecutive classes you need to recover — and note how fast that number grows if you keep skipping.
The arithmetic of bunking, stated plainly
Skipping a class changes the denominator: after k missed classes your attendance is attended ÷ (held + k). The calculator solves that inequality for the largest safe k. At 90 attended of 100 held with a 75% floor, you can miss 20 straight classes and land exactly on the line — the 21st takes you under.
Recovery is the same algebra in reverse and it is crueller, because attending helps both numerator and denominator while skipping hurt only one. From 55 of 80 (68.75%), reaching 75% takes 20 consecutive attended classes. The asymmetry is the whole lesson: falling below the line is quick, climbing back is slow.
Both projections assume the pattern is unbroken — 'can skip 20' means twenty misses in a row with nothing attended between, the worst case. Real terms interleave both, so treat the numbers as the boundary of what is survivable rather than a budget to spend.
Where the 75% rule comes from, and how it is applied
Most Indian universities condition exam eligibility on roughly 75% attendance, a figure inherited from UGC and professional-council norms — medical and technical programmes sometimes set it higher, and individual colleges add their own subject-wise floors. The requirement field is editable for exactly that reason.
Two implementation details decide borderline cases. First, whether the rule applies per subject or in aggregate: a comfortable aggregate can hide one subject below its own line. Run this calculator per subject if your college counts that way. Second, how medical leave is treated — condoned absence at some colleges effectively raises your numerator, at others merely annotates the record. The registrar's rule beats any calculator's assumption.
The end-of-term panic has a date arithmetic to it too: the later in the term you are, the less any single class moves the percentage, in either direction. The same 5 missed classes cost 6.7 points in week three and 1.7 points in week twelve.
Using the number like an adult
The honest use of this tool is a margin check, not permission. Knowing you can miss six more classes tells you what a fever in exam week would cost; spending all six on convenience leaves zero margin for the fever. Colleges that detain students at 74.5% exist, and appeals argued from a calculator screenshot do not go well.
If you are below the line with weeks left, the mustAttend figure turns dread into a plan: it is a specific number of consecutive classes, it shrinks with every one attended, and showing a tutor the arithmetic of your recovery is a far better conversation than showing up at the detention list.
The calculator runs entirely in your browser — attendance figures, like everything else on this site, are never uploaded anywhere.
Frequently asked questions
How many classes can I miss and keep 75%?
The largest k with attended ÷ (held + k) still ≥ 75%. The calculator solves it exactly — at 90 of 100, the answer is 20 consecutive misses; the 21st drops you below.
I'm below 75%. How many classes do I need to attend?
The smallest k with (attended + k) ÷ (held + k) ≥ 75% — shown as 'classes you must attend'. From 55 of 80, it is 20 straight classes; every additional skip inflates it quickly.
Does the rule apply per subject or overall?
It varies by college — many count per subject, which an aggregate number can mask. If yours does, run the calculator once per subject with that subject's figures.
Does medical leave count as attendance?
College-dependent: some condone certified absence (effectively adding to your attended count), others only note it. Check the registrar's rule before relying on either treatment.
Is my attendance data uploaded?
No — two divisions in your browser. Nothing you enter is transmitted or stored.