Marks and GradesWhat the calculator tells you
- Your attendance percentage so far.
- If you are below the required level: how many classes in a row you must attend to reach it.
- If you are above it: how many classes you could miss and still be at or above it.
- If you give the number of classes still to be held: how many of those you must attend, and whether the required level can still be reached by the end of the term.
Why catching up takes so long
Each class you attend adds to both the classes attended and the classes held. At a requirement of 75%, attending four classes makes up for one class of shortage. A student who is 3 classes short therefore needs 12 classes without a miss. The earlier you notice a shortage, the easier it is to repair.
The 75% figure
CBSE's FAQs of 2016 state that at least 75% attendance in an academic session is required to be eligible for the class 9 to 12 examinations. The CISCE regulations for 2028 say candidates below 75% of the working days are ordinarily not eligible, and allow shortage to be condoned down to 60% by the Chief Executive and Secretary. Universities set their own levels. Change the "Required percentage" box to match your institution. Details and the formulas are in the guide the 75% attendance rule.
Subject-wise attendance
If your institution counts each subject separately, run the calculator once for each subject, and separately for practicals where they are counted apart.
Questions people ask
How do I calculate attendance percentage?
Divide the classes you attended by the classes held and multiply by 100. 132 out of 180 is 73.3%.
How many classes do I need to attend to get 75%?
If you have attended a out of h classes, you need (0.75 × h − a) ÷ 0.25 more classes without a miss, rounded up. For 132 out of 180 that is 12.
How many classes can I bunk and keep 75%?
Attended ÷ 0.75 − held, rounded down. With 150 out of 180 you could miss 20 more and be at exactly 75%, which leaves no margin.
Is 75% attendance compulsory?
It is the level stated in the CBSE and CISCE documents we read. Your own school, college or university's rule is the one that applies to you.
Check with your board or university. The rules quoted on this site were read in the official documents on 12 November 2026. Boards and universities revise them, and yours may differ. For anything that decides an admission or a job, use the rule printed on your own mark sheet or in your institution's regulations. This is an independent site.