Attendance Percentage & Bunk Calculator Math

Attendance percentage is simply classes present divided by classes conducted (so far), times 100. Colleges often enforce a 75% (or 80%) minimum. The useful follow-up question is: how many more can I miss? or how many must I attend to recover?

Current attendance

attendance % = (attended ÷ held) × 100

Example: attended 42 of 50 → (42 ÷ 50) × 100 = 84%.

Classes you can still miss (bunk budget)

If the minimum required is R% (e.g. 75) and you already have A attended out of H held, and T total classes are planned for the term:

Let remaining classes = T − H.

You need at least ceil(R/100 × T) attended by the end (policy rounding varies).

A practical framing: after missing M more classes while attending the rest of the remaining ones,

final % = (A + (T − H − M)) / T × 100

Solve for the largest M that still keeps final % ≥ R.

Classes needed to reach a target

If you are below the bar and F more classes will be held:

need attend X such that (A + X) / (H + F) ≥ R/100
→ X ≥ R/100 × (H + F) − A

Round up to whole classes. If X > F, you cannot recover in this window alone.

Worked example

• Attended 30 / held 45 → 66.7%
• Target 75%, 15 classes left (H+F = 60)
• Need 0.75 × 60 − 30 = 15 — you must attend all 15.

Privacy

Attendance counts are personal. Keep them in a browser tool rather than a random cloud sheet.

Use TryCalculatingNow Attendance Percentage Calculator

TryCalculatingNow Attendance Percentage Calculator computes current %, bunk room, and classes needed for a cutoff. Sibling: marks percentage when you are scoring exams instead of counting seats.

FAQ

Do medical leaves count as present?

Policy-dependent. Some colleges mark “exempt” without adding to the denominator; others require make-up.

Is 74.9% rounded to 75%?

Often no. Assume the strict cutoff unless your handbook says otherwise.

What if “held” differs by subject?

Compute per subject if each has its own minimum.

Can I include future planned holidays?

Only if they are not class days — do not inflate “held” with non-instruction days.