Calculate your current attendance percentage, and how many more classes you need to attend (or can safely miss) to hit a target percentage.
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Current attendance is Classes Attended ÷ Total Classes Held × 100. Classes needed to reach a target assumes you attend every future class from now on, and solves for how many additional classes (attended and held) bring your percentage up to the target. Classes you can skip assumes you keep attending as before, and finds how many future classes (held but not attended) you can miss while staying at or above the target.
For example, with 40 of 50 classes attended, current attendance = 40 ÷ 50 × 100 = 80%. Against a 75% target, you're already above it, so classes needed shows 0, and classes you can skip works out to 3, meaning you could miss the next 3 classes entirely and your attendance would still land right at 75%.
If you're below your target, 'classes needed' tells you how many consecutive classes you must attend to catch up. If you're already above target, 'classes you can skip' tells you your safety margin before you'd fall below it. Only one of the two will typically be a meaningful non-zero number at a time.
Reading 'classes needed' and 'classes can skip' as both being live, relevant numbers at once, only one is typically meaningful at a time, if you're below target you'll see a real 'classes needed' figure and a 0 for 'can skip', and vice versa if you're above target.
Forgetting that 'classes needed' assumes perfect attendance from now on, if you expect to miss any future classes too, you'll need more than the calculated number of additional classes to actually reach your target.
Setting a 100% target after already missing classes and expecting a usable number back, past absences can't be undone, so 100% becomes mathematically unreachable at that point, the calculator correctly flags this as not applicable rather than showing a misleading number.
The 'classes needed' figure assumes you attend all future classes without missing any, since that's the fastest way to recover a low attendance percentage. The 'classes you can skip' figure assumes the opposite, that you keep missing future classes while target-holding your percentage.
If you've already missed any classes, 100% attendance can no longer be reached since past classes can't be un-missed, so the calculator shows this as not applicable.
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