65% Attendance Calculator
Enter your classes held and attended to see whether you meet the 65% attendance requirement, how many classes you can still miss, or how many you must attend in a row to get back to 65%.
You are above 65%. You can miss up to 19 of the next classes and still be eligible.
Step-by-step solution
- Current attendance = (45 ÷ 50) × 100 = 90%
- To stay at 65%: 45 ÷ (50 + y) ≥ 0.65
- y ≤ 45 ÷ 0.65 − 50 = 19.23 → you can miss 19 classes
65% attendance ready reckoner
Minimum classes you must attend, and the most you can miss, to be at exactly 65% after a given number of classes.
| Classes held | Must attend (min) | Can miss (max) |
|---|---|---|
| 10 | 7 | 3 |
| 20 | 13 | 7 |
| 30 | 20 | 10 |
| 40 | 26 | 14 |
| 50 | 33 | 17 |
| 60 | 39 | 21 |
| 80 | 52 | 28 |
| 100 | 65 | 35 |
| 120 | 78 | 42 |
| 150 | 98 | 52 |
| 200 | 130 | 70 |
The formula
Attendance % = attended ÷ held × 100. To stay at 65%, you can miss floor(attended ÷ 0.65 − held) more classes. If you are below 65%, attend ceil((0.65 × held − attended) ÷ 0.35) classes in a row.
Frequently asked questions
How many classes can I miss with a 65% attendance requirement?
Out of every 100 classes you can miss at most 35. For your own numbers, enter them in the calculator above — it accounts for classes already held.
How do I calculate if I have 65% attendance?
Divide classes attended by classes held and multiply by 100. If the result is 65 or more, you meet the requirement.
I am below 65%. How many classes must I attend?
Use (0.65 × held − attended) ÷ (1 − 0.65) and round up. For example, with 33 of 60 classes you need to attend the next 18 classes without a break.