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75% attendance - how many classes can I miss, and how many must I attend to recover?

Updated on 5 October 2026

The short answer. Attendance is classes attended ÷ classes held × 100. At 75%, the classes you can still miss is attended ÷ 0.75 − held, rounded down: 60 of 70 attended means 80 − 70 = 10 more. To recover, you need (0.75 × held − attended) ÷ 0.25 classes in a row, rounded up: from 45 of 64, that is 12.

The 75% rule is the line most Indian schools, boards and colleges draw for being allowed to sit the exam. Falling under it rarely happens in one bad week; it happens slowly, a few classes at a time, and is noticed only when recovering needs more classes than the term has left. Both formulas below are simple enough to do on a phone calculator.

The three formulas

Question Formula At 75%
What is my attendance? attended ÷ held × 100 45 ÷ 64 × 100 = 70.3%
How many more can I miss and stay at the minimum? attended × 100 ÷ minimum − held, rounded down 60 × 100 ÷ 75 − 70 = 10
How many in a row must I attend to reach the minimum? (minimum × held − 100 × attended) ÷ (100 − minimum), rounded up (75 × 64 − 100 × 45) ÷ 25 = 12

The rounding matters. You can miss whole classes only, so the number you can miss is rounded down; you must attend whole classes, so the number you need is rounded up.

Why recovering is so slow

Each class missed costs more than each class attended gives back. At 75%, one missed class needs three attended classes to undo it, because the 25% you are allowed to miss has to cover the whole new total. At 80%, it needs four. That is the arithmetic behind "I was only a few classes short and still could not catch up".

How to work out your own numbers

  1. Find the official figures: classes held and classes attended, from the college portal or the attendance register. Your own count is not what will be checked.
  2. Check whether the minimum applies to the total, to each subject, or to both. Many colleges apply it per subject, including labs.
  3. Enter attended, held and your minimum in the 75% Attendance Calculator. It shows your percentage, the classes you can miss or the classes you need.
  4. If you know how many classes are left in the term, enter that too. It tells you whether reaching the minimum is still possible, and the best percentage you can finish with.
  5. For subjects, switch to per-subject mode and enter each one; the weakest subject is the one to plan around.

A worked example

Rahul has attended 45 of 64 lectures, 70.3%. His college requires 75%, and 30 lectures remain in the term.

  • To reach 75% now: (75 × 64 − 100 × 45) ÷ 25 = (4,800 − 4,500) ÷ 25 = 12 lectures in a row. After that he has 57 of 76, which is exactly 75%.
  • By the end of term: 94 lectures in total, so he needs 0.75 × 94 = 70.5, rounded up to 71 attended. He has 45, so he must attend 26 of the remaining 30 and can miss only 4.
  • If he misses one more first: he is at 45 of 65, and needs (4,875 − 4,500) ÷ 25 = 15 in a row. One missed lecture cost three more.

What the rules actually say

CBSE schools. CBSE's Examination Bye-Laws, rules 13 and 14, require a minimum of 75% attendance to appear in the Class X and XII board examinations. The board allows a relaxation of up to 25% only for exigencies such as a medical emergency or national or international sports participation, supported by documents submitted at the time. Its August 2025 circular told schools to apply this strictly for 2025-26 and warned that students absent without leave records may be barred as non-attending.

Colleges and universities. Each university sets its own rule in its ordinances or regulations, commonly 75% per course, sometimes with a smaller condonation band on medical grounds and a fee. The student handbook or the examination ordinance is the authority; a rule from another university does not apply to you.

Common details that change the arithmetic:

  • Medical and duty leave. Some colleges count approved leave as attended, others subtract it from classes held, others ignore it.
  • Labs and tutorials. Often counted as separate courses, each with its own 75%.
  • Detention lists. Many colleges publish a shortage list before exams; the attendance figure on it is the one that decides eligibility.

If it doesn't work

  • Your figure differs from the portal's. The portal may count labs, tutorials or extra classes differently, or exclude cancelled ones. Use the portal's numbers, and raise a discrepancy in writing early.
  • The calculator says the minimum can no longer be reached. Even attending every remaining class leaves you short. Ask about condonation now, with documents for any medical absence; waiting until the shortage list appears is usually too late.
  • The answer to "how many can I miss" is negative. You are already below the minimum. Use the other formula, the classes needed to recover.
  • The rule is 80% or 85%, not 75%. Enter your minimum instead of 75; the formulas work for any figure.

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Questions people ask

How many classes can I miss and still have 75% attendance?

Divide the classes attended by 0.75 and subtract the classes held, then round down. With 60 attended out of 70 held, 60 ÷ 0.75 = 80, and 80 − 70 = 10, so ten more classes can be missed while staying at exactly 75%. Attending more classes first raises that number by one for every three attended.

How many classes do I need to attend to get 75% attendance?

Use (0.75 × classes held − classes attended) ÷ 0.25 and round up. With 45 attended out of 64, that is (48 − 45) ÷ 0.25 = 12, so twelve classes in a row bring attendance to exactly 75%. Missing any of them in between adds three more to the count.

Is 75% attendance compulsory for CBSE board exams?

Yes. CBSE's Examination Bye-Laws, rules 13 and 14, set 75% attendance as the minimum to appear in the Class X and XII board exams. The board can relax it by up to 25% for exigencies such as a medical emergency or sports at national level, only with documents submitted at the time of the absence.

Does medical leave count towards attendance?

Rules differ. CBSE considers documented medical emergencies for its relaxation of up to 25%, with a leave application and a doctor's certificate submitted at the time. Colleges and universities set their own rules: some count approved medical leave as present, some reduce the classes held, and some only consider it during condonation. The college's own regulations decide.

How do I calculate my attendance percentage?

Divide the number of classes you attended by the number of classes held, then multiply by 100. For example, 45 classes attended out of 64 held is 45 ÷ 64 × 100 = 70.3%. If the minimum applies per subject, calculate each subject separately as well as the total, since a shortage in one subject can bar you from that exam.

Sources

Checked 5 Oct 2026:

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