Attendance Percentage Calculator (75% Rule Planner)
Attendance Percentage Calculator
Most schools and universities enforce a minimum attendance — commonly 75% — before you're allowed to sit exams. This calculator gives you your exact current percentage, and the planner mode answers the two questions every student eventually asks: how many classes do I have to attend to get back above the line? and how many can I still safely miss?
The attendance percentage formula
Attendance % = (Classes attended ÷ Total classes held) × 100
Attended 68 of 90 lectures? That's (68 ÷ 90) × 100 = 75.56% — just above a 75% requirement, with no room to spare.
How the planner works
If you're below the target, attending a class improves both your attended count and the total, so recovery is slow: the planner solves (attended + n) ÷ (total + n) ≥ target for the smallest whole n. If you're above the target, it solves the reverse — the largest number of classes you can miss while staying at or over the line. From 50 of 80 (62.5%), reaching 75% takes 40 consecutive classes; from 70 of 80 (87.5%), you can miss 13.
Why falling behind is expensive
Every missed class is permanent — it stays in the total forever. At a 75% threshold, each skipped class costs three attended ones to offset. Checking the planner before deciding to skip is the whole point of this tool. For your marks instead of your attendance, use the marks percentage calculator.
FAQs
Divide the number of classes you attended by the total number of classes held, then multiply by 100. Attending 68 of 90 classes gives (68 ÷ 90) × 100 = 75.56%.
If you're below the target, every future class you attend raises both your attended and total counts. The planner mode solves this exactly: with 50 of 80 attended (62.5%), you need 40 consecutive classes to reach 75%.
If you're above the target, the planner tells you the maximum classes you can skip. With 70 of 80 attended (87.5%), you can miss 13 more and still sit at exactly 75.27%.
Because each missed class permanently increases the total. Dropping from 75% requires attending three classes for every one you missed just to climb back — which is why the planner numbers are often larger than students expect.
Yes. The math is identical for any attended-out-of-scheduled count: work shifts, training sessions, or lecture halls.