Bunk calculator
Wondering how many classes you can skip without getting debarred from exams? This bunk calculator tells you exactly how many classes you can miss while keeping your attendance at or above the required threshold. Enter the classes you have attended, the total held so far, and your required percentage. Everything runs in your browser — nothing is stored or sent anywhere.
All calculations run in your browser. Nothing is stored or transmitted.
How the Bunk calculator works
The bunk calculator starts with your current attendance: (attended ÷ total) × 100. If you are already below the threshold, you cannot bunk any more classes — the calculator will tell you this.
To find how many classes you can skip, it solves for the maximum number of future absences that keep your attendance at or above the required percentage. Each bunked class increases the total but not the attended count.
The "classes you can miss" number is your bunk budget. If it shows 3, you can skip up to 3 future classes and still meet the requirement. If you skip a 4th, you fall below.
If your attendance is already below the threshold, the calculator shows how many consecutive classes you must attend to recover, and the bunk budget becomes zero.
Worked example
A student has attended 50 classes out of 56 held. The college requires 75% attendance.
Current attendance is (50 ÷ 56) × 100 = 89.29%. The student is well above 75% and can miss 10 more classes. Verification: (50 ÷ (56 + 10)) × 100 = (50 ÷ 66) × 100 = 75.76%, which is still above 75%. Missing an 11th would give (50 ÷ 67) × 100 = 74.63%, which is below.
Common mistakes to avoid
Bunking too many classes at once
Your bunk budget is a total, not a per-week allowance. If the calculator says you can miss 6 classes, that is 6 for the rest of the semester — not 6 per week. Spread them out and recalculate after each absence.
Not recalculating after missing classes
Every class you miss reduces your buffer. If you had 6 classes you could miss and you skipped 2, you now have only 4 left. Recalculate regularly to stay on top of your budget.
Forgetting that new classes also shrink the buffer
Even if you attend every class, the buffer changes as the total grows. A student at 80% with 50 classes held has a different bunk budget than one at 80% with 100 classes held. Recalculate after each class.
Using the bunk budget without checking the threshold
Make sure you have the right threshold for your institution. If you need 80% but calculate with 75%, your bunk budget will be dangerously inflated.