Attendance Calculator

About this calculator

Many schools, colleges and universities set a minimum attendance. Enter the classes held, the classes you attended and the percentage you need to see where you stand, how many more classes you can miss, or how many you must attend in a row to catch up.

How it works

• Your attendance is classes attended divided by classes held, times 100.
• If you are at or above the target t (as a fraction), you can miss up to (attended divided by t) minus classes held more classes, rounded down. With 34 of 40 and a 75% target, that is 5.
• If you are below it, you must attend (t times classes held minus attended) divided by (1 minus t) more classes in a row, rounded up. With 24 of 40 and a 75% target, that is 24, giving 48 of 64.
• A 100% target cannot be reached once a class has been missed, and the calculator says so.

Common questions

What target should I enter?

The minimum in your own institution's rules or course handbook. Rules differ, and some count labs, tutorials or late arrivals differently.

Does it count classes that are still to come?

It assumes each class you miss or attend is a class held, so future classes are counted as they happen. Enter the numbers so far for the current result.