Enter how many classes have been held and how many you attended, and this attendance calculator shows your current percentage, how many classes you can still miss, or how many you must attend in a row to get back to the minimum.
The required percentage starts at 75%, the figure many Indian colleges and universities use, and you can change it to 65, 70, 80, 85 or any value your institution sets. If you also know the total number of classes in the term, the tool tells you how many of the remaining classes you need to attend.
The calculation runs in your browser and nothing you enter is saved or sent anywhere. Your own college or university decides the real rule, so use the result as arithmetic, not as a ruling.
Reviewed by: CalcMojo Editorial Team
How attendance percentage is calculated
Attendance percentage is the share of classes you attended out of the classes held so far:
Attendance % = classes attended / classes held x 100
With the default numbers, 28 attended out of 40 held is 28 / 40 x 100 = 70%. If the minimum is 75%, you are 5 percentage points short.
The percentage changes with every class. Attending raises both the top and the bottom of the fraction, while missing a class raises only the bottom. That is why missing one class when you have high attendance costs less than it does when attendance is already low, and why catching up takes more classes than the shortfall suggests.
How many classes can you skip?
If your attendance is at or above the minimum, the tool finds the largest number of extra classes you can miss and still stay at or above it. If you have attended A classes and the minimum is R%, the total number of classes you can reach without falling below R% is A x 100 / R. The classes you can miss are that number minus the classes held so far, rounded down.
Example: 36 attended out of 40 held is 90%. At a 75% minimum, 36 x 100 / 75 = 48 classes in total. You have had 40, so you can miss 8 more. Check: 36 / 48 = 75%, exactly on the line. A ninth missed class gives 36 / 49 = 73.5%, which is below.
The tool counts a result of exactly the minimum as meeting it. Some institutions require strictly more than the minimum, or round differently, so keep a margin of a class or two.
How many classes must you attend in a row?
If you are below the minimum, the tool shows how many classes you must attend without missing any to reach it. Each class you attend adds 1 to both attended and held. With R as the minimum, the number you need is:
Classes needed = (R x held - 100 x attended) / (100 - R), rounded up
Example with the default numbers: R = 75, held = 40, attended = 28. The top is 75 x 40 - 100 x 28 = 3000 - 2800 = 200. The bottom is 100 - 75 = 25. So 200 / 25 = 8 classes. Check: 36 attended out of 48 held is 75%.
Notice the size of the catch-up. You were 5 points short, and it takes 8 straight classes to fix it. The lower your percentage, the longer it takes: with 10 attended out of 20 held (50%), you need 20 consecutive classes to reach 75%.
A 100% requirement can never be reached again once you have missed a class, because the percentage can approach 100% but never get there. The tool says so rather than showing a number.
Planning a whole term
If you add the total number of classes in the term, the planner works out how many you must attend in total, how many of those are still ahead, and how many of the remaining classes you can miss.
Example: a term of 100 classes, 40 held, 28 attended, minimum 75%. You need 75% of 100 = 75 classes attended in total. You have 28, so you must attend 47 more. There are 60 classes remaining, so you can miss at most 13. If you needed more classes than remain, the tool tells you that even perfect attendance from now on will not reach the minimum, and shows the best percentage you could finish with.
The 75% attendance rule: where it comes from
Many colleges in India require 75% attendance to be allowed to sit the semester or annual examination. This is widely attributed to University Grants Commission (UGC) guidance. Reports of the UGC's 2003 regulations on minimum standards for the first degree say attendance should ordinarily not be less than 75%, and courts have referred to 75% as the usual floor. Later UGC regulations (2025) are reported to leave the minimum to each institution and its statutory bodies. We were not able to open the primary UGC text to confirm the exact wording, so treat this history as background.
What matters in practice is your own institution's rule. There is no single national figure that applies everywhere:
- Many universities and colleges use 75%, but some use 70%, 80% or a different number for particular courses.
- Some count attendance per subject, others per semester overall, and practicals may be counted separately.
- Some allow condonation: a committee can permit students who fall a few points short, sometimes with a fee, a medical certificate or a minimum lower limit. The rules differ widely.
- Professional and technical courses may have their own regulators and their own rules.
Look for the attendance clause in your university's examination regulations or your college's student handbook, and check whether it is per subject, whether condonation exists, and how late joiners and approved leave are counted.
Tips for staying above the line
- Check your attendance often, not only before exams. Small gaps are easy to fix; large ones are not.
- Keep a margin. Work to the minimum plus a few points, because a class that was marked absent in error, or a sudden illness, can use up your spare classes.
- Ask for proof early. Medical leave, sports representation and official duty usually need paperwork submitted within a deadline.
- Remember the per-subject rule. A healthy overall percentage does not help if one subject is below the minimum.
- Use the term planner before taking a long break, to see how many classes you can safely miss.
Limits of this calculator
It assumes each class counts equally and that you attend or miss entire classes. It does not know about duty leave, medical condonation, extra classes that were cancelled, or weights between theory and practical hours. If your institution counts hours rather than classes, enter hours instead. The result is only as accurate as the numbers you enter.
Frequently asked questions
How do I calculate attendance percentage?
Divide the classes you attended by the classes held, then multiply by 100. For example, 28 attended out of 40 held is 28 / 40 x 100 = 70%.
How many classes can I miss and still have 75% attendance?
Multiply your attended classes by 100, divide by 75, and subtract the classes held so far, rounding down. With 36 attended out of 40, that is 36 x 100 / 75 = 48, minus 40, so 8 classes.
How many classes do I need to attend to reach 75%?
Use (75 x held - 100 x attended) / 25, rounded up. With 28 attended out of 40 held, you need (3000 - 2800) / 25 = 8 consecutive classes.
Is 75% attendance compulsory everywhere in India?
No single rule applies everywhere. 75% is the most common figure and is often linked to UGC guidance, but each university or college sets its own minimum and its own exceptions. Check your institution's regulations.
What is attendance condonation?
It is an exception some universities allow, where students slightly below the minimum may still be permitted to sit exams, usually after a request and sometimes a fee or medical proof. Whether it exists, and the limits, depend on your university.
Does the calculator work for a different requirement such as 80%?
Yes. Change the required percentage, or use the preset buttons, and every result updates.
Can I use it for hours instead of classes?
Yes, if your institution counts hours. Enter hours held and hours attended as whole numbers. The arithmetic is the same.
Why does it say a 100% requirement cannot be reached?
After missing even one class, your percentage can get close to 100% but never equal it, because the missed class stays in the total.
Sources & Methodology
- University Grants Commission (UGC), regulations section — the UGC publishes its Minimum Standards of Instruction regulations here. We could not open the primary 75% clause, so the history above is reported background only and not a confirmed quotation.
- Formulas: attendance % = attended / held x 100; classes you can skip = floor(attended x 100 / required - held); classes to attend in a row = ceil((required x held - 100 x attended) / (100 - required)). The tests check these against hand-worked examples and against a brute-force count for every combination up to 60 classes.
- The default 75% is an editable starting value. It is not a universal legal requirement.
This calculator does arithmetic only. The attendance rules that apply to you are set by your college or university and may include per-subject limits and condonation procedures. Confirm your eligibility with your institution.
Data accurate as of: November 2026