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Attendance calculator
Classes you must attend, or can still miss, to meet an attendance rule.
Quick answer
Attendance is the share of classes held that you attended, and the calculator shows how many more you need or can miss. Formula: Attendance % = attended ÷ total × 100. At 60 of 90 classes (66.7%) with 75% required, you must attend the next 30 classes in a row.
Read the guide: How to calculate attendance and the classes you can miss
Classes to attend in a row to reach the requirement
30
- Your attendance
- 66.67%
You are below 75%. Attend the next 30 classes without a miss and you will meet it.
How is attendance calculated?
If you are below the rule, every class you attend raises both the top and the bottom of the fraction. The calculator finds how many in a row you need.
If you are above it, it shows how many classes you can skip before you drop to the limit.
Counts must be whole classes; some colleges count lab hours differently, so use their definition.
What is the formula for attendance?
- Attendance % = attended ÷ total × 100
- Classes needed: x such that (attended + x) ÷ (total + x) ≥ required, so x = (required × total − attended) ÷ (1 − required)
- Classes you can miss: m such that attended ÷ (total + m) ≥ required, so m = attended ÷ required − total
Can you show a worked example of attendance?
60 of 90 classes is 66.67%. For 75%: x = (0.75 × 90 − 60) ÷ 0.25 = 30. After 30 more classes you have 90 of 120, which is exactly 75%.
How many classes can I miss, or must I attend?
With 75% attendance required.
| Attended | Held | Attendance | What it means |
|---|---|---|---|
| 45 | 60 | 75% | Can miss 0 more |
| 60 | 90 | 66.67% | Attend the next 30 in a row |
| 70 | 100 | 70% | Attend the next 20 in a row |
| 80 | 100 | 80% | Can miss 6 more |
| 90 | 100 | 90% | Can miss 20 more |
Common questions
How is attendance percentage calculated?
Classes attended divided by classes held, times 100.
What attendance do colleges require?
Many Indian universities ask for 75%, but rules differ. Check your institution.
Do medical leaves count?
Some colleges allow condonation for medical leave. Ask your office; this tool uses plain counts.
Does it assume I never miss again?
For the classes you need, yes. For classes you can miss, it assumes you attend all the others.