70% Attendance Calculator
Enter your classes held and attended to see whether you meet the 70% attendance requirement, how many classes you can still miss, or how many you must attend in a row to get back to 70%.
You are above 70%. You can miss up to 14 of the next classes and still be eligible.
Step-by-step solution
- Current attendance = (45 ÷ 50) × 100 = 90%
- To stay at 70%: 45 ÷ (50 + y) ≥ 0.7
- y ≤ 45 ÷ 0.7 − 50 = 14.29 → you can miss 14 classes
70% attendance ready reckoner
Minimum classes you must attend, and the most you can miss, to be at exactly 70% after a given number of classes.
| Classes held | Must attend (min) | Can miss (max) |
|---|---|---|
| 10 | 7 | 3 |
| 20 | 14 | 6 |
| 30 | 21 | 9 |
| 40 | 28 | 12 |
| 50 | 35 | 15 |
| 60 | 42 | 18 |
| 80 | 56 | 24 |
| 100 | 70 | 30 |
| 120 | 84 | 36 |
| 150 | 105 | 45 |
| 200 | 140 | 60 |
The formula
Attendance % = attended ÷ held × 100. To stay at 70%, you can miss floor(attended ÷ 0.7 − held) more classes. If you are below 70%, attend ceil((0.7 × held − attended) ÷ 0.3) classes in a row.
Frequently asked questions
How many classes can I miss with a 70% attendance requirement?
Out of every 100 classes you can miss at most 30. For your own numbers, enter them in the calculator above — it accounts for classes already held.
How do I calculate if I have 70% attendance?
Divide classes attended by classes held and multiply by 100. If the result is 70 or more, you meet the requirement.
I am below 70%. How many classes must I attend?
Use (0.7 × held − attended) ÷ (1 − 0.7) and round up. For example, with 36 of 60 classes you need to attend the next 20 classes without a break.