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Attendance Calculator
Check your attendance and find out how many classes you need to attend, or can skip, to stay above the minimum.
Formulas
- Attendance % = attended ÷ total × 100
- Classes to attend (to reach target t) = (t × total − attended) ÷ (1 − t), rounded up
- Classes you can miss = attended ÷ t − total, rounded down
Example
You have attended 42 of 60 classes, which is 70%. To reach 75% you must attend the next 12 classes without missing any (54 of 72).
Tips
- Count labs and lectures the way your college does; some calculate attendance per subject.
- Don't plan to sit exactly at the limit: one unexpected absence pushes you below it.
Frequently asked questions
How many classes do I need to reach 75%?
Classes needed = (0.75 × total − attended) ÷ 0.25, rounded up. With 42 of 60 attended you need 12 more classes in a row: 54 out of 72 is 75%.
How many classes can I miss and stay at 75%?
Classes you can miss = attended ÷ 0.75 − total, rounded down. With 45 of 50 attended you can miss 10: 45 out of 60 is still 75%.
Can I use a different requirement, like 80% or 85%?
Yes. Change the required attendance; the formulas work for any percentage.