About this calculator
If you are above the requirement, you see how many classes you can miss; if below, how many you must attend in a row.
How to use it
- Enter classes attended.
- Enter classes held so far.
- Enter the required percentage.
The formula
Can miss x: attended ÷ (held + x) ≥ required; must attend x: (attended + x) ÷ (held + x) ≥ required
- required
- usually 75%
Worked example
62 attended out of 80, 75% required
- Current attendance = 77.5%.
- You can miss 2 more classes: 62 ÷ 82 = 75.6%, but 62 ÷ 83 = 74.7%.
What the result means
Medical leave may be counted separately under your college’s rules.
Assumptions
- Every class counts equally.
Limitations
- Labs and lectures may be counted separately.
Frequently asked questions
How many classes can I miss for 75%?
Enter your numbers; the calculator gives the exact count.
How do I calculate attendance percentage?
Classes attended ÷ classes held × 100.
Is 75% attendance compulsory?
Many universities and boards require it; check your institution.
Last reviewed on 3 October 2026. Found a mistake? Tell us.