How to calculate attendance percentage
Attendance percentage = classes attended ÷ classes held × 100. Count only the days classes were actually held.
| Classes held | 220 |
|---|---|
| Classes attended | 170 |
| Sum | 170 ÷ 220 × 100 |
| Attendance | 77.27% |
Attendance percentage calculator
Type the classes held and the classes attended. It shows the attendance percentage, and how many classes in a row bring it up to 75%, or how many can still be missed.
Good to know
Working out attendance
The formula, the classes needed for 75%, the CBSE rule, and a whole class’s percentage.
How many classes do you need for 75%?
Each class attended raises the count above and below the line, so it takes more classes than the gap looks. For 75%, the classes needed in a row are 3 × classes held − 4 × classes attended.
| Attendance now | What it takes |
|---|---|
| 70 of 100 (70%) | 3 × 100 − 4 × 70 = 20 classes, then 90 of 120 = 75% |
| 60 of 81 (74.07%) | 3 × 81 − 4 × 60 = 3 classes, then 63 of 84 = 75% |
| 80 of 100 (80%) | Already above: (4 × 80 − 3 × 100) ÷ 3 = 6 classes can still be missed |
For any other target T, the classes needed are (T × held − 100 × attended) ÷ (100 − T), rounded up. The calculator above does this for whatever target you type.
The CBSE 75% attendance rule
Rules 13 and 14 of the CBSE Examination Bye-Laws ask for at least 75% attendance to sit the Class 10 and 12 board exams. CBSE’s circular of 4 August 2025 repeated this for the 2025-26 session.
- Up to 25% can be relaxed only for medical emergencies, national or international sports, and other serious reasons, with documents
- Leave is applied for in writing, with medical papers for illness; leave without a written request counts as unauthorised absence
- Registers are updated daily and signed by the class teacher, ready for CBSE to inspect
- Parents of a student falling short are told in writing
Attendance percentage for a whole class
For a class’s monthly register, add up every student’s days present and divide by students × working days. A class of 40 with 880 presences in a 24-day month has 880 ÷ (40 × 24) × 100 = 91.67%.
Keeping attendance for a whole school?In Scoolin, teachers mark attendance on their phones, class by class, so the days held and days present come from the register itself, not from counting by hand.
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About attendance.
Something else?Scoolin keeps every class’s daily attendance. See it on a call.
How do you calculate attendance percentage?
Divide the classes attended by the classes held and multiply by 100. A student present on 170 of 220 working days has 170 ÷ 220 × 100 = 77.27%.
How many classes do I need to attend to reach 75%?
Three times the classes held, minus four times the classes attended, rounded up. With 70 of 100, that is 300 − 280 = 20 classes in a row: 90 of 120 is exactly 75%.
How many classes can I miss and still have 75%?
Four times the classes attended, minus three times the classes held, divided by three and rounded down. With 80 of 100, that is (320 − 300) ÷ 3 = 6.67, so 6 more classes.
Is 75% attendance compulsory for CBSE board exams?
Yes. CBSE’s circular of 4 August 2025 repeats Rules 13 and 14 of its Examination Bye-Laws: a student needs at least 75% attendance to sit the Class 10 or 12 board exams. Up to 25% can be relaxed only for medical emergencies, national or international sports and other serious reasons, with documents.
Should holidays and Sundays be counted?
No. Count only the days the school or college actually held classes. Holidays, Sundays and days the school was shut are left out of both numbers.