🎓 Attendance
Attendance Calculator — 75% Rule & Bunk Planner
See where you stand, how many classes you can still miss, and — if you have already slipped — exactly how many you must attend in a row to get back above the line. Add your subjects to check each one separately, since most colleges enforce a minimum per subject as well as overall. Part of the free ToolAdda calculators, alongside the GPA & CGPA calculator and the percentage calculator.
75% is the figure most Indian colleges quote — check your own handbook, plenty use 70% or 80%.
Add this to see the best and worst percentage you can still finish on.
Enter how many classes were held to see where you stand.
End of term
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Add your subjects to see the combined figure.
How attendance percentage is calculated
The formula is the easy part. Divide the classes you attended by the classes held, and multiply by a hundred.
45 ÷ 60 × 100 = 75%
Why "how many can I bunk" is a different question
Most calculators stop at the percentage, which is the least useful number. What a student actually needs is one of two answers, and they come from different formulas because missing a class and attending one are not opposites.
Missing a class adds one to the classes held and nothing to the classes attended. Attending one adds to both, so it moves the ratio far more slowly. That asymmetry is why a student at 90% can miss twenty classes before touching 75%, while a student at 70% has to attend twenty in a row just to climb back to the same line.
classes you must attend: (required × held − 100 × attended) ÷ (100 − required)
This calculator shows whichever of the two applies, and never both — you are either in credit or in deficit.
Subject-wise versus overall
Check both. Most colleges enforce a minimum per subject and an overall minimum, and it is common to clear one while failing the other.
One warning about the overall number: it is the ratio of your total attended to your total held — not the average of your subject percentages. Averaging treats a ten-class lab and a forty-lecture course as equals. A student at 90% in the lab and 50% in the course is not at 70% overall; they are at 58%, and the difference is the gap between comfortable and barred from the exam.
When the requirement is out of reach
Enter the classes still left in the term and the calculator works out the highest percentage you can possibly finish on. If that number is below your requirement it says so plainly rather than showing you a target you cannot hit. At that point arithmetic has nothing left to offer and the next step is your department office — condonation, medical leave and duty leave are decided there.
Is 75% actually the rule?
75% is the figure most Indian universities quote, and it is the number usually associated with UGC guidance. But the requirement is set by each institution, not by one national law. Plenty of colleges use 70% or 80%, many count practicals separately from lectures, and some weight a three-hour lab as three periods — which means one missed lab can cost as much as three missed lectures. Set the requirement field to whatever your own handbook states, and enter periods rather than sessions if that is how your portal counts.
How many classes can you miss? A quick reference
If your attendance is perfect so far, this is the number of classes you can afford to skip before you drop below the line. Every figure comes from the same calculation the tool above runs.
| Classes held | 65% rule | 70% rule | 75% rule | 80% rule |
|---|---|---|---|---|
| 20 | 10 | 8 | 6 | 5 |
| 30 | 16 | 12 | 10 | 7 |
| 40 | 21 | 17 | 13 | 10 |
| 50 | 26 | 21 | 16 | 12 |
| 60 | 32 | 25 | 20 | 15 |
| 75 | 40 | 32 | 25 | 18 |
| 80 | 43 | 34 | 26 | 20 |
| 100 | 53 | 42 | 33 | 25 |
| 120 | 64 | 51 | 40 | 30 |
Note what happens as the term goes on: the budget grows with the number of classes held, because the percentage is a ratio and not a fixed allowance. Sixty classes in, a 75% rule leaves room for twenty misses. That is the whole term's allowance, not a weekly one.
What it takes to recover, in numbers
The other direction is harsher, and it is where most students are surprised. Say a hundred classes have been held:
| Attended | Percentage | Can still miss | Must attend in a row |
|---|---|---|---|
| 90 | 90% | 20 | 0 |
| 85 | 85% | 13 | 0 |
| 80 | 80% | 6 | 0 |
| 75 | 75% | 0 | 0 |
| 74 | 74% | 0 | 4 |
| 70 | 70% | 0 | 20 |
| 65 | 65% | 0 | 40 |
| 60 | 60% | 0 | 60 |
| 50 | 50% | 0 | 100 |
Read the last two rows carefully. At 60% you would need sixty consecutive classes to get back to 75%; at 50% you would need a hundred. In most semesters those classes simply do not exist, which is the real reason the tool tells you when a target has become unreachable rather than printing a number you cannot act on.
The words you will meet if you fall short
Being below the required percentage when the register closes. It is calculated per subject as well as overall at most institutions, so it is possible to be short in one paper while comfortable everywhere else.
Formal permission to sit the exam despite a shortage, usually granted within a band — commonly 65% to 75% — on medical or duty grounds, often with a fee and a written application. It is a decision made by your department, not an entitlement, and it is not something arithmetic can promise you.
Barred from sitting the examination for that subject or semester because attendance fell too far below the requirement for condonation. Usually the paper has to be repeated with the next batch.
Absence for an activity the institution itself sanctioned — a sports fixture, a conference, an NSS or NCC camp. Many colleges credit it as attended; others exclude those classes from the total held. The two are not the same, and which one your college does changes your percentage.
Does every university use 75%?
No. 75% is the figure most Indian universities quote and the one usually associated with UGC guidance, but the requirement is set by each institution and often varies by programme within one university. Technical universities such as AKTU, VTU and Anna University, and state universities such as Mumbai and IP, each publish their own rule, and several count practicals separately from lectures or weight a three-hour lab as three periods.
That is why the requirement here is an editable field with presets from 60% to 85% rather than a hardcoded 75. Use the number in your own handbook or student portal — a calculator that assumes 75% is wrong for everyone whose college does not.
If your portal weights a lab as several periods, enter periods rather than sessions. The arithmetic is identical; only the counts change, and matching the counts your college records is what makes the percentage here match the one they publish.
A worked example
Priya has attended 34 of 50 lectures. That is 68%, four points short of her college's 75% rule, with 30 lectures left in the semester.
- Where she stands: 34 ÷ 50 × 100 = 68%.
- To recover: she needs 14 consecutive lectures — (75 × 50 − 100 × 34) ÷ (100 − 75) = 350 ÷ 25 = 14. After those, she is at 48 of 64, which is 75%.
- Best case: attending all 30 remaining puts her at 64 of 80 — 80%.
- Worst case: attending none leaves her at 34 of 80 — 42.5%.
- The margin she has: almost none — she must attend 26 of the remaining 30, so she can afford to miss only 4 more all term.
Notice that recovering cost her 14 classes to gain 7 percentage points, while a student at 90% could have missed 20 classes to lose 15. That asymmetry is the single most useful thing to understand about attendance, and it is why acting early costs so much less than acting late.
Frequently asked questions
How is attendance percentage calculated?
Divide the classes you attended by the total classes held, then multiply by 100. If you attended 45 of 60 classes that is 45 ÷ 60 × 100 = 75%.
How many classes can I bunk and still keep 75%?
It depends on how far above the line you already are, not on a fixed number. At 90 of 100 you can miss 20 more. At 76 of 100 you can miss exactly one.
Why do I have to attend so many classes to gain one percent?
Missing a class adds one to the total only; attending one adds to both the attended count and the total, so it moves the ratio more slowly. Recovering is always harder than slipping.
Is 75% attendance a legal requirement in India?
It is the figure most universities quote, but the rule is set by each institution rather than by a single national law. Use your own handbook's number.
Should I calculate attendance per subject or overall?
Both — most colleges enforce a minimum for each. The overall figure here is the ratio of totals, not the average of subject percentages, because averaging can tell you that you are fine when you are not.
What if I can no longer reach the requirement?
Enter the classes left and the tool shows the highest percentage still reachable. If it is below your requirement it says so, and the next step is your department office.
Does this tool store my attendance data?
Your subject list is saved in your own browser so it is there when you return. It never leaves your device, and Reset clears it immediately.
Do medical leave and duty leave count as attendance?
That is an institutional decision. Whichever way your college records it, enter the resulting counts here — the arithmetic is the same once the numbers are settled.
What counts as a class — a lecture, a lab or a tutorial?
Whatever your college counts. Many weight a three-hour lab as three periods, so enter periods rather than sessions if that is how your portal reports it.
What happens if my attendance is short?
It depends how short. Within the band your college allows — often 65% to 75% — you can usually apply for condonation on medical or duty grounds, generally with a fee and supporting documents. Below that band, most institutions detain you from the examination for that subject, which means repeating it with the next batch. Your department office decides both, not the arithmetic.
What is condonation of attendance shortage?
Formal permission to sit the exam despite being below the requirement. It is normally available only within a band above a hard floor, needs a written application with evidence, and often carries a fee. Treat it as a discretion your department exercises, not a right you can plan around.
How do I calculate attendance for six subjects?
Use the Subject-wise tab and add a row per subject. Check each one against your requirement, because most colleges enforce a per-subject minimum as well as an overall one. The overall figure shown is the ratio of your total attended to your total held — not the average of the six percentages, which would misreport a small lab against a large lecture course.
Is attendance counted per semester or for the whole year?
Almost always per semester, and reset at the start of the next one. A few programmes aggregate across the year. Enter whichever period your portal reports, since the calculation is the same either way.
Does low attendance affect my marks or only exam eligibility?
Usually eligibility rather than marks — you are either permitted to sit the paper or you are not. Some institutions do award internal or sessional marks partly on attendance, in which case a shortage costs you twice. Check your scheme of examination.
How many classes can I miss if 60 have been held?
With perfect attendance so far and a 75% rule, twenty. The reference table above lists the figure for common totals at 65%, 70%, 75% and 80%. If you have already missed some, enter your own numbers — the budget depends on where you actually are, not on the total alone.
Can I work out attendance for a date range?
No — this tool works on counts, not dates. Take the attended and held figures for whatever period you care about from your portal and enter those. A date-based calculation would need your timetable and the college calendar, including every holiday and cancelled class, which no calculator can know.
Can I use this for school rather than college?
Yes. The arithmetic is identical — only the requirement changes. Set it to your school's figure.
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