Attendance Calculator
Check your attendance percentage and find how many classes you must attend, or can safely skip, to stay above the required limit.
Formula last reviewed 4 August 2026 · How we verify our calculators
Current attendance
- Classes to attend (consecutively)
- 60
- Classes you can still skip
- 0
Updates live as you type
Frequently asked questions
Divide the classes you attended by the total classes held and multiply by 100. Attending 60 of 100 classes is 60% attendance.
If you are below the limit, you must attend enough consecutive classes so that (attended + x) ÷ (total + x) reaches the threshold. For 60/100 at 75%, that is 60 more classes attended without missing any.
If you are above the limit, you can miss classes until attended ÷ (total + skipped) drops to the threshold. At 90/100 with a 75% rule, you can skip up to 20 classes.
Because each skipped class increases the denominator too. Recovering a low percentage requires a long unbroken run of attendance, which is why staying above the line is far easier than climbing back.
Falling from 90% to 75% is easy. Climbing back is brutal.
At 90 classes attended out of 100 held, staying above a 75% requirement leaves room to skip 20 more classes before hitting the line — solving 90 ÷ (100 + x) = 0.75 gives that headroom directly. But drop to 60 out of 100 — already below the 75% line — and recovering requires 60 more classes attended without a single miss, solving (60 + x) ÷ (100 + x) = 0.75. Falling behind and climbing back aren't mirror images of the same problem; one costs 20 classes of margin, the other costs 60 classes of perfect attendance.
Why the two directions aren't symmetric
Every class held adds to the denominator, whether you attend it or not — which is exactly what makes catching up so much harder than staying ahead. Missing a class while already behind doesn't just fail to help your percentage, it also grows the total you're being measured against, compounding the shortfall rather than merely pausing progress toward it.
What this calculator actually answers
Enter classes attended, total held, and the required percentage, and it answers whichever of two questions actually applies to you: if you're short, how many classes you need to attend consecutively to cross back over the line; if you're comfortable, how many you can still afford to skip while staying above it.
Use this to plan leave in advance, manage a genuinely busy week without accidentally crossing the line, or check eligibility before an exam. Always confirm your institution's official rule too — some count attendance by individual subject rather than overall, or apply rounding that can shift the exact numbers by a class or two from what this calculator shows.