Attendance calculator for the 75% rule
Most Indian colleges, universities and school boards require students to attend at least 75% of classes to sit their exams, and falling short can mean being “detained” for a semester. This attendance calculator tells you exactly where you stand: your attendance percentage, how many classes you must attend in a row to get back above the limit, or how many you can safely miss.
Add the number of classes left in the term to see the best percentage you can still finish with. Switch to subject-wise mode to track every subject separately — many universities apply the rule per subject, not just overall. The required percentage is editable, so the tool also works for 60%, 80% or 85% rules and for school attendance in the US and UK.
How to use the Attendance Calculator
- Check the required attendance — it is set to 75%, the most common minimum; change it if your college uses a different rule.
- In Overall mode, enter the classes you have attended and the total classes held so far.
- Optionally enter how many classes are left this term to see how many of them you must attend.
- Read your percentage and the advice: classes to attend in a row, or classes you can still miss.
- For several subjects, choose Subject-wise and enter attended and held for each subject.
Attendance Calculator features
Classes to attend
The exact number of consecutive classes needed to climb back to your target percentage.
Classes you can skip
How many more classes you can miss and still stay at or above the requirement.
End-of-term planning
With the number of classes left, see the minimum you must attend and the best percentage still possible.
Subject-wise tracking
One row per subject with its own percentage and status, plus your overall attendance.
Any percentage rule
Works for 75% and for any other requirement between 0% and 100%.
Saved on your phone
Your numbers and subjects are remembered in your browser for next time.
Attendance formulas with an example
Attendance % = classes attended ÷ classes held × 100. With 30 of 45 classes attended, attendance is 30 ÷ 45 × 100 = 66.67%.
Classes to attend to reach a target t (as a decimal): x = (t × held − attended) ÷ (1 − t), rounded up. For 75%: (0.75 × 45 − 30) ÷ 0.25 = 15, and indeed 45 ÷ 60 = 75%.
Classes you can skip: y = attended ÷ t − held, rounded down. With 40 of 48 attended: 40 ÷ 0.75 − 48 = 5.33, so you can miss 5 classes (40 ÷ 53 = 75.47%) but not 6 (40 ÷ 54 = 74.07%).
With classes left R, you must attend at least t × (held + R) − attended of them. With 20 classes left: 0.75 × 65 − 30 = 18.75, so 19 of the 20.
Attendance rules in India, the UK and the US
- CBSE requires at least 75% attendance to appear in the Class 10 and Class 12 board exams, with limited relaxation in exceptional cases such as serious illness.
- Universities and engineering colleges in India commonly set 75% per subject or per course. Many allow condonation of a small shortfall for medical or other genuine reasons — the limits and fees differ, so read your university’s ordinance.
- England: a pupil who misses 10% or more of possible school sessions is classed as “persistently absent” by the Department for Education. Universities set their own engagement rules, which matter especially for international students.
- United States: missing 10% or more of school days is widely used as the definition of chronic absenteeism; colleges usually leave attendance policies to each course syllabus.
Tips to stay above the limit
- Count labs and tutorials separately if your college records them separately — a subject can fall short even when your overall attendance looks fine.
- Plan absences early in the term: the more classes have been held, the less one absence moves your percentage.
- Keep medical certificates and leave letters; they are usually needed for any condonation request.
- Once your attendance is safe, track your marks with the marks percentage calculator and convert grades with the CGPA to percentage converter.
Attendance Calculator FAQ
How do I calculate my attendance percentage?
Divide the classes you attended by the total classes held and multiply by 100. For example, 34 of 42 classes is 34 ÷ 42 × 100 = 80.95%. The attendance calculator does this as you type.
How many classes do I need to attend to get 75% attendance?
Use (0.75 × classes held − classes attended) ÷ 0.25 and round up. If you have attended 28 of 40 classes, you need (30 − 28) ÷ 0.25 = 8 more classes in a row: 36 of 48 is exactly 75%.
How many classes can I bunk and still have 75%?
Divide the classes attended by 0.75, subtract the classes held and round down. With 40 of 48 attended you can miss 5 more classes. The calculator shows this as “Can still miss”.
Is the 75% rule applied per subject or overall?
It depends on your institution. Many Indian universities apply it to each subject or course, which is why the subject-wise mode shows every subject separately. Check your college’s rules or ask your department.
What if I can’t reach 75% even by attending every remaining class?
Enter the classes left this term and the calculator shows the best percentage still possible. If it is below the requirement, speak to your department early about condonation, medical leave or other provisions.
Does the calculator work for a different attendance requirement?
Yes. Change “Required attendance” to any percentage, such as 60%, 80% or 85%, and every result updates.