Attendance Percentage Calculator

Divide the number of classes you attended by the total number of classes held, then multiply by 100. For example, if you attended 60 of 80 classes, that is 60 divided by 80, which equals 0.75, or 75 percent. The calculator does this for you and also tells you how many classes you missed.

If you are below the threshold, every future class you attend raises both your attended count and the total. The number you need is the smallest whole count x where (attended plus x) divided by (total plus x) reaches your required percentage. The calculator rounds up to a whole class, since you cannot attend a fraction of a session, and assumes you attend each one without missing any.

When you already meet the requirement, you have a margin. Each class you skip raises the total held but not your attended count, so it lowers your percentage. The calculator finds the largest whole number of future classes you can miss while staying at or above the threshold, and missing even one more drops you below it.

A 100 percent requirement means you must have attended every single class. Once you miss even one, the absence stays on your record permanently, and attending future classes cannot erase it. So if you are below 100 percent and the minimum is 100 percent, there is no way to recover, and the tool reports that directly.

Most schools and universities use the same simple ratio of attended to total sessions, with 75 percent being a common minimum to sit exams. Some institutions weight classes differently, count labs separately, or grant exemptions for medical reasons. Treat this as a planning estimate and confirm the exact rules and any rounding policy with your own institution.