Attendance percentage, explained
Your attendance rate is simply classes attended ÷ classes held × 100. Many schools and universities enforce a minimum — often 75% in India, 85–90% for US/UK attendance policies — below which you may be barred from exams or have marks deducted.
How many classes can I miss?
With N classes remaining and a required attendance of R%, the maximum you can skip is the largest number M where (attended + N − M) ÷ (held + N) ≥ R%. In practice: the more classes you've already attended, the more skips you can afford; the tighter the rule (85% vs 75%), the fewer.
Example: 37 of 40 classes attended, 20 classes left, 75% rule. You can miss 12 more classes and still finish at exactly 75%. Miss 13 and you dip to 73.3%.
Tips
- Don't spend absences early in the term — medical emergencies happen later.
- Some colleges count a day as multiple "periods" or lecture hours; enter the units your record uses.
- If your attendance policy is "no more than X absences" instead of a percentage, just count directly.