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Attendance calculator for the 75% rule

Your attendance percentage is classes attended divided by classes held, times 100, and the calculator below also tells you exactly how many more classes you must attend in a row to reach 75% or how many you can skip and still stay above it. Enter each subject once and the numbers update as you mark classes; everything is saved only in your browser.

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Attendance calculator

See your percentage, how many classes you must attend to reach 75%, and how many you can safely miss. Track each subject and tap Present or Absent after class.

Required attendance

Subjects

Optional, for the projection

67%target 75%

Attend next

15 classes

in a row to reach 75%

Exact percentage

66.67%

30 of 45 classes

Minimum to finish term

27 of 30

remaining classes to end at 75%

If you attend all

80%

at the end of term

Below the requirement? Many universities allow condonation for medical or official reasons. Check your institution's rule and draft a request with the condonation request writer.

Subjects and counts are saved only in this browser. Nothing is uploaded.

Saved in this browser only. Back up to move to another device.

Worked example: 30 of 45 classes attended

  1. 1Current attendance: 30 ÷ 45 × 100 = 66.67%, which is below 75%.
  2. 2Classes needed: ceil((75 × 45 − 100 × 30) ÷ (100 − 75)) = ceil((3375 − 3000) ÷ 25) = 15.
  3. 3Check: after 15 more classes you have attended 45 of 60, and 45 ÷ 60 = 75%.
  4. 4A second subject at 40 of 48 (83.33%) can afford floor((100 × 40 − 75 × 48) ÷ 75) = floor(400 ÷ 75) = 5 skips.
  5. 5Check: 40 of 53 is 75.47%, but a sixth skip gives 40 of 54 = 74.07%.

Attend the next 15 classes of the first subject without a break; you can miss up to 5 classes of the second and still be at or above 75%.

How do I calculate how many classes I need for 75%?

Assume you attend every class from now on. If you have attended A of H classes and want T percent, you need x more classes where (A + x) ÷ (H + x) ≥ T ÷ 100. Solving for x gives x = (T × H − 100 × A) ÷ (100 − T), rounded up to the next whole class. The calculator does this for every subject at once, so you can see which subject is closest to the line and which ones need a run of perfect attendance.

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

The safe-skip number is the largest count of classes you can miss while your percentage stays at or above the target: floor((100 × A − T × H) ÷ T). It assumes those classes are actually held and marked. Treat it as a ceiling, not a budget. Lab sessions, surprise extra lectures and tutorials that count separately can all push a borderline subject under the limit, so keep a margin of one or two classes.

What happens if attendance is below 75% in an Indian college?

Many Indian universities and autonomous colleges require 75% attendance per subject to sit the end-semester exam. A common arrangement lets students between roughly 65% and 75% apply for condonation with a valid reason such as a medical certificate, sometimes with a fee, while students below the lower limit may be detained or asked to repeat the course. The exact limits, documents and deadlines differ, so check your institution's rule in the academic regulations or with your department office before you rely on condonation.

Tips to keep attendance safe

  • Record attendance the same day; a week of guessing is how surprises happen.
  • Compare your count with the official portal at least monthly and raise mismatches early.
  • Keep medical certificates and event letters; they are usually needed for condonation or duty leave.
  • Check whether labs and theory are counted separately for the 75% rule at your college.
  • Plan known absences, such as fests or family events, using the safe-skip number rather than guessing.

Attendance calculator: questions and answers

Is the 75% attendance rule per subject or overall?

It depends on the university. Many count each subject separately, so a strong overall average does not protect one weak subject; others use the aggregate. Some also treat lab and theory components of the same course as separate. Check your institution's rule in the academic regulations and track each subject on its own here to be safe.

Why does the calculator say I need so many classes?

Because every new class also adds to the total held. At 30 of 45, attending 10 more only reaches 40 of 55, which is 72.73%. Each class you attend moves the percentage less as the total grows, which is why the formula divides by (100 − T). Starting early is far easier than catching up late in the semester.

Can I use a target other than 75%?

Yes. Set any target, for example 80% or 85% if your college or scholarship asks for it, or 65% to see the usual condonation threshold. The same formulas apply with T replaced by your target, and the classes-needed and safe-skip numbers update immediately.

Does my attendance data go to the college or AltFTool?

No. AltF Campus stores your subjects and counts in your browser's local storage on this device only. Nothing is uploaded and there is no account. It is a personal tracker, so the official record is always whatever your college portal or register shows.

What should I write in a condonation request?

State your roll number, subject, current attendance, the reason for absence with dates, and attach proof such as a medical certificate. Keep it short and factual. The attendance shortage condonation request tool in the related links drafts a letter you can edit, but your department decides whether condonation is allowed.

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AltF Campus has no account and no server-side storage. Everything you enter is kept in your browser's local storage until you clear it.