85% Attendance Calculator
Enter your classes held and attended to see whether you meet the 85% attendance requirement, how many classes you can still miss, or how many you must attend in a row to get back to 85%.
You are above 85%. You can miss up to 2 of the next classes and still be eligible.
Step-by-step solution
- Current attendance = (45 ÷ 50) × 100 = 90%
- To stay at 85%: 45 ÷ (50 + y) ≥ 0.85
- y ≤ 45 ÷ 0.85 − 50 = 2.94 → you can miss 2 classes
85% attendance ready reckoner
Minimum classes you must attend, and the most you can miss, to be at exactly 85% after a given number of classes.
| Classes held | Must attend (min) | Can miss (max) |
|---|---|---|
| 10 | 9 | 1 |
| 20 | 17 | 3 |
| 30 | 26 | 4 |
| 40 | 34 | 6 |
| 50 | 43 | 7 |
| 60 | 51 | 9 |
| 80 | 68 | 12 |
| 100 | 85 | 15 |
| 120 | 102 | 18 |
| 150 | 128 | 22 |
| 200 | 170 | 30 |
The formula
Attendance % = attended ÷ held × 100. To stay at 85%, you can miss floor(attended ÷ 0.85 − held) more classes. If you are below 85%, attend ceil((0.85 × held − attended) ÷ 0.15) classes in a row.
Frequently asked questions
How many classes can I miss with a 85% attendance requirement?
Out of every 100 classes you can miss at most 15. For your own numbers, enter them in the calculator above — it accounts for classes already held.
How do I calculate if I have 85% attendance?
Divide classes attended by classes held and multiply by 100. If the result is 85 or more, you meet the requirement.
I am below 85%. How many classes must I attend?
Use (0.85 × held − attended) ÷ (1 − 0.85) and round up. For example, with 45 of 60 classes you need to attend the next 40 classes without a break.