Attendance Percentage Calculator: How Many Classes Can I Miss?

How it works

attendance % = attended ÷ held × 100 · can miss = ⌊attended ÷ minimum − held⌋ · must attend in a row = ⌈(minimum × held − attended) ÷ (1 − minimum)⌉ · term: need = ⌈minimum × (held + remaining)⌉ − attended

Attendance is the share of the classes held that you attended. You can enter either the classes you missed or the ones you attended. Each future absence adds one to the classes held but nothing to the classes attended, while each class you attend adds one to both. Solving those two relations against your minimum gives the largest number of classes you can still miss, or the shortest run of attendance that lifts you back over the line. If you know how many classes are left in the term, the calculator also works out the end-of-term picture: how many of the remaining classes you must attend to finish at or above the minimum, how many you can skip, and the best and worst final percentages. The tables compare other common targets (65% to 90%) and show what each extra absence does to your percentage. A 75% minimum to sit end-of-term exams is common, for example at many universities in India, and 80% is also widely used; always check your own course rules.

Worked example

60 classes held with 8 missed means 52 attended, or 86.7%. Against a 75% minimum: 52 ÷ 0.75 − 60 = 9.33, so you can miss 9 more. Check: 52 of 69 is 75.36%, while a tenth miss (52 of 70) falls to 74.29%. With a 90% target instead, you would need ⌈(0.9 × 60 − 52) ÷ 0.1⌉ = 20 classes in a row.

Sources: Miniwebtool: Attendance percentage calculator (formulas and examples) · OpenEduCat: Attendance calculator (term planning example) · OnlineResult: Attendance and safe bunk planner

Frequently asked questions