Attendance percentage calculator
This attendance percentage calculator shows where you stand and what it takes to get where you need to be: enter the classes held so far and the classes you attended, set the required percentage, and it tells you how many classes you can still bunk – or how many you must attend in a row to be safe.
Example: Classes held so far 120 · Classes attended 84 · Required attendance 75 % → Your attendance: Attendance 70% (84 of 120 classes). Source: CBSE Examination Bye-Laws, Rules 13 and 14, Central Board of Secondary Education: circular of 4 August 2025, “Strict Compliance with attendance requirements as per CBSE Examination Bye-Laws for Board Examination Eligibility” (minimum of 75% attendance under Rules 13 and 14; 25% relaxation only in cases such as medical emergencies). Updated: .
How it is calculated
Attendance percentage = classes attended ÷ classes held × 100. If 120 classes were held and you attended 84, your attendance is 84 ÷ 120 × 100 = 70%.
How to use the attendance percentage calculator
- Enter the classes held so far and the classes you attended. Count lectures, periods or hours – whatever your institution counts.
- Set the required attendance. 75% is preset because CBSE and many colleges require it.
- Read the result: your percentage, and either the number of classes you can miss or the number you have to attend in a row.
- Optional: enter the classes still to come this term to see how many of them you need.
How many classes do I need to attend to reach 75%?
If you are below the requirement, every class you attend raises both the attended and the held count. The number of classes you must attend without a break is:
classes needed = (required % × classes held − classes attended) ÷ (100% − required %), rounded up.
Example: 84 of 120 classes, 75% required. (0.75 × 120 − 84) ÷ 0.25 = (90 − 84) ÷ 0.25 = 24. After 24 more classes you are at 108 of 144 = 75%.
How many classes can I bunk?
If you are above the requirement, each class you miss raises only the held count:
classes you can miss = classes attended ÷ required % − classes held, rounded down.
Example: 96 of 120 classes is 80%. 96 ÷ 0.75 − 120 = 128 − 120 = 8. You can miss the next 8 classes and still be at 96 of 128 = 75%.
Planning the rest of the semester
When you know how many classes are still to come, the question becomes: how many of those must I attend? The answer is required % × (classes held + classes to come) − classes attended, rounded up. Example: 84 of 120 so far, 40 classes to come, 75% required: 0.75 × 160 − 84 = 36. You must attend 36 of the remaining 40 and can miss 4.
Where does the 75% rule come from?
| Where | What applies |
|---|---|
| CBSE Classes X and XII | a minimum of 75% attendance is mandatory to be eligible for the Board examinations (Examination Bye-Laws, Rules 13 and 14); a relaxation is possible only in cases such as medical emergencies, with documents |
| Colleges and universities | each university sets its own figure in its ordinances – often 75%, sometimes per subject, sometimes overall |
| Other boards and coaching | check your own handbook; change the “Required attendance” field to match |
Tips
- If attendance is counted per subject, run the calculator once for each subject – a good overall figure does not save a weak subject.
- Check how your institution rounds: 74.6% is not always accepted as 75%.
- The page address stores your numbers, so you can bookmark it and update the counts every week, or share the result on WhatsApp.
- To convert your marks as well, see the percentage calculator for marks and the CGPA to percentage calculator.
Frequently asked questions
How do I calculate my attendance percentage?
Divide the classes you attended by the classes held and multiply by 100. Example: 84 attended out of 120 held is 84 ÷ 120 × 100 = 70%.
How many classes can I miss with 75% attendance?
Divide the classes attended by 0.75, subtract the classes held and round down. With 96 of 120 classes: 96 ÷ 0.75 − 120 = 8 classes.
How many classes must I attend to get back to 75%?
Use (0.75 × classes held − classes attended) ÷ 0.25 and round up. With 84 of 120 classes that is (90 − 84) ÷ 0.25 = 24 classes in a row.
Is 75% attendance compulsory?
For CBSE Classes X and XII, yes: the Examination Bye-Laws require at least 75% to be eligible for the Board examinations. Colleges and universities set their own requirement, so check your regulations.
Does medical leave count as attendance?
That depends on the institution. Many grant a relaxation or condonation for documented medical reasons. The calculator counts only classes actually attended.
Can I use it for one subject only?
Yes. Enter the classes held and attended for that subject. If your college checks attendance per subject, calculate each subject separately.
Can I calculate for a different requirement, such as 80% or 85%?
Yes. Change “Required attendance” to any value from 1% to 100%; every result and formula on the page follows.
Why does the number of classes needed look so high?
Because every class you attend also increases the classes held. To move from 70% to 75% you need 24 straight classes after 120, not 6.
Sources and legal basis
- CBSE Examination Bye-Laws, Rules 13 and 14: Central Board of Secondary Education: circular of 4 August 2025, “Strict Compliance with attendance requirements as per CBSE Examination Bye-Laws for Board Examination Eligibility” (minimum of 75% attendance under Rules 13 and 14; 25% relaxation only in cases such as medical emergencies)
As of: · Editorial policy
Related tools
- Percentage calculator for marksPercentage calculator for marks: enter the marks of each subject and get total, percentage and best-of-5 result. For 10th, 12th and semester marksheets.
- CGPA to Percentage Calculator (and Percentage to CGPA)CGPA to percentage calculator for the 10-point scale: CBSE formula (CGPA × 9.5), × 10 or your university’s own formula – also percentage to CGPA, with working.
- SGPA to CGPA CalculatorSGPA to CGPA calculator: enter each semester’s SGPA and credits and get your CGPA by the UGC formula, rounded to two decimals, with every step of the working.
- Percentage CalculatorFree percentage calculator: find X% of a number, what percent one number is of another, percentage change, increase and discount – with formula and steps.
- What grade do I need? Calculate the score for your targetWhat grade do I need on my final? Enter your grades with their weights and your target, and see at once which score you must reach – or if it is out of reach.
- Online CalculatorCalculator online, free and instant: type or tap and see the answer as you go – order of operations, brackets, percent, square root, steps and a history list.
- Birthday Paradox CalculatorBirthday paradox calculator: probability of shared birthdays among n people, or the group size for a chosen probability, with a table and the working shown.
- Bayes Theorem CalculatorBayes theorem calculator: probability after a positive or negative test result from base rate, sensitivity and false positive rate, with a frequency tree.
- Empirical Rule CalculatorEmpirical rule calculator: find the ranges holding 68 %, 95 % and 99.7 % of values around the mean, plus the z-score of a single value, with steps.