Attendance Calculator

About the attendance calculator

This calculator turns a class register into a percentage and tells you what it means for your eligibility. Enter the total classes held, the classes you attended and the attendance requirement your school, college or exam board enforces, and the tool shows your current attendance, how many classes you can still miss, and how many you must attend in a row to climb back above the line.

How attendance percentage is calculated

Your attendance is the classes attended divided by the classes held, multiplied by 100. If you attended 72 of 100 classes, that is 72%. As you attend more classes both numbers grow, so the percentage moves slowly once the year is well under way — which is why a few missed classes late in the term can be hard to recover.

How many classes you can still miss

If you are above the requirement, the calculator finds the largest number of future classes you can skip and still land exactly on the target. This is the buffer a regularly attending student builds up. The maths solves attended ÷ (held + missed) ≥ target, so a student at 80% against a 75% rule can usually miss a handful of classes, while a student sitting exactly on the requirement can miss none.

How many classes you must attend

If you are below the requirement, the calculator works out the shortest run of classes you must attend to get back to the target. Note that if the requirement is 100%, no amount of extra attendance can recover a missed class — the only way to reach 100% is never to have missed one.