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Attendance Calculator

Find your attendance percentage, and see exactly how many classes you must attend in a row to reach 75% (or any requirement), or how many you can still miss and stay above it.

How to use this calculator

  1. Enter the total number of classes held so far.
  2. Enter how many of them you attended.
  3. Set the attendance requirement; 75% is the most common minimum at Indian colleges.
  4. Read the result. Above the requirement, it shows how many classes you can miss; below it, how many you must attend in a row to recover.

Formula

Attendance % = A ÷ T × 100 · Classes needed = ⌈(R × T − 100 × A) ÷ (100 − R)⌉ · Classes you can miss = ⌊(100 × A − R × T) ÷ R⌋

T
total classes held so far
A
classes attended
R
required attendance percentage

Classes needed assumes you attend every one of them. A 100% requirement cannot be recovered once any class has been missed.

Worked example

You have attended 45 out of 60 classes and need 75%.

  1. Current attendance45 ÷ 60 × 100 = 75%
  2. Classes you can miss(100×45 − 75×60) ÷ 75 = 0

You are exactly at 75%, so missing even one more class drops you below the requirement.

How to calculate attendance percentage

Divide the classes you attended by the classes held and multiply by 100. Attending 52 of 68 classes is 52 ÷ 68 × 100 = 76.47%. The same calculation works for any percentage; the percentage calculator handles other cases such as marks.

How many classes can I miss and still keep 75%?

If you are above the requirement, each class you miss lowers your percentage. These are the margins at 75%:

  • Attended 36 of 40 (90%): you can miss 8 more classes.
  • Attended 48 of 60 (80%): you can miss 4 more.
  • Attended 52 of 68 (76.47%): you can miss 1 more.
  • Attended 45 of 60 (exactly 75%): you cannot miss any.

How many classes do I need to attend to reach 75%?

Recovering is slower than falling behind, because every class you attend has to pull up an average that includes your absences. At a 75% requirement, each class missed needs three classes attended to make up for it. If you start attending every class from now:

  • Attended 40 of 60 (66.67%): attend the next 20 in a row to reach 75%.
  • Attended 70 of 100 (70%): attend the next 20 in a row.
  • Attended 50 of 80 (62.5%): attend the next 40 in a row.

Planning for the whole semester

The calculator works from classes held so far. If you know how many classes the whole semester will have, you can also plan ahead: multiply the total by your requirement and round up to find how many you must attend overall.

For a semester of 90 lectures at 75%, that is 67.5, so 68 lectures. Subtract the lectures you have already attended to see how many of the remaining ones you still need.

Things to keep in mind

  • Colleges may count lectures, tutorials and labs separately, each with its own requirement.
  • Medical leave and approved absences are handled by your institution's rules and are not modelled here.

Frequently asked questions

How many classes can I miss with 75% attendance required?

It depends on how many classes have been held and how many you have attended. Enter both above and the calculator shows exactly how many you can still miss, or how many you must attend in a row to recover.

What is 75% attendance out of 60 classes?

45 classes, because 60 × 0.75 = 45. When the answer is not a whole number, round up: 75% of 50 classes is 37.5, so you need 38.

Does the calculator account for classes still to be held?

It works from classes held so far. To plan for the rest of the semester, use the method in Planning for the whole semester above, or add the classes you expect to the total and assume you attend them.

What happens if my attendance is below 75%?

That depends on your college or university. Many Indian institutions set 75% as the minimum to sit end-semester exams, and some consider medical or other approved leave separately. Check your institution's rules for the exact requirement and exceptions.

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