Attendance Calculator: How Many Classes Can I Miss?
Enter the classes held and the classes you attended to see your attendance percentage. The calculator tells you how many classes you can still miss and stay above 75% (or any limit you choose), or how many classes in a row you must attend to get back above it.
What if…
How to calculate attendance percentage
Example: you attended 42 of 60 classes. 42 ÷ 60 × 100 = 70%, which is below 75%.
How many classes do I need to attend to reach 75%?
If you attend every class from now on, each class adds one to both the classes held and the classes attended. To reach a required percentage R, the number of classes you must attend in a row is:
For 42 of 60 and a 75% target: (75 × 60 − 100 × 42) ÷ 25 = 300 ÷ 25 = 12 classes. After that you will have 54 of 72 = exactly 75%.
How many classes can I miss and still have 75%?
If you are above the limit, each class you miss adds to the classes held but not to the classes attended. The number of classes you can miss in a row is:
For 48 of 60 (80%) and a 75% limit: (4,800 − 4,500) ÷ 75 = 4 classes. After missing them you will have 48 of 64 = 75%.
Being exactly at the limit leaves no room for error. A surprise extra lecture, a lab counted twice or an absence that was not marked correctly can push you below it, so keep a margin of a few classes.
The 75% attendance rule
Many schools, colleges and universities in India require at least 75% attendance to sit the final examinations. For CBSE board exams, the Board’s circular of 4 August 2025 says a minimum of 75% attendance is mandatory under Rules 13 and 14 of its Examination Bye-Laws, with a relaxation of up to 25% only in cases such as medical emergencies, participation in national or international sports events, or other serious reasons backed by documents.
Colleges and universities set their own rules. Some count each subject separately, some count theory and practical sessions separately, and some allow condonation for medical leave or college events. Check your institution’s rules and use the same counting method here, for example one subject at a time.
Tips to manage your attendance
- Track it weekly, not just before exams. The earlier you notice a shortfall, the fewer classes you need to recover.
- Use the full-term plan. Enter the classes left this term to see whether the target is still reachable and how many of the remaining classes you can safely miss.
- Keep documents such as medical certificates for any absence that may qualify for relaxation or condonation.
- Check your records with the class teacher or the attendance portal regularly, so mistakes are fixed early.
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Frequently asked questions
How do I calculate my attendance percentage?
Divide the classes you attended by the total classes held and multiply by 100. For example, 45 out of 55 is 81.82%.
How many classes can I bunk with 75% attendance?
It depends on how many classes you have attended so far. Enter your numbers above and the calculator shows how many classes in a row you can miss while staying at or above 75%.
Can I still reach 75% this term?
Enter the number of classes left this term. The calculator shows the highest attendance you can reach if you attend every remaining class, and whether that is enough.
Does the calculator round my percentage up?
No. It shows the percentage to two decimal places and never rounds up to meet the limit. Some institutions round, but you should not rely on that.
Is attendance counted subject-wise?
Many colleges count attendance for each subject, and some count theory and practical separately. If yours does, use the calculator once for each subject.
Is my data saved?
No. The calculation runs in your browser and nothing is sent to our server.
About this tool. The results use the attendance formulas shown above, with whole classes rounded in the safe direction: classes you must attend are rounded up, and classes you can miss are rounded down. The CBSE rule is taken from CBSE’s circular dated 4 August 2025. Before publishing, we checked the results against worked examples, including being exactly at the limit, a 100% target and targets that cannot be reached this term.
Last reviewed: October 2026.