Attendance Percentage Calculator
Work out your attendance percentage, how many classes in a row you need to reach 75% (or any minimum), and how many you can miss and stay above it. Add the classes left in the term to plan the rest.
How to Use
- Choose Classes for a college or school subject, or School days to check absences against a chronic-absence line.
- Enter the classes you attended and the classes held so far (or days absent and school days so far).
- Set the minimum your college or school uses. It starts at 75%; law students under the Bar Council of India rules would use 70%.
- Optional: enter the classes (or days) left in the term to see exactly how many of them you must attend.
- Read the result, the bar and the table of what missing or attending the next few classes would do. Or press a preset.
Worked Example
36 of 50 classes, 75% needed. Attendance is 36 ÷ 50 × 100 = 72%. Each class you attend adds one to both numbers, so solve (36 + x) ÷ (50 + x) = 0.75: x = (0.75 × 50 − 36) ÷ (1 − 0.75) = 1.5 ÷ 0.25 = 6 classes in a row. Check: 42 ÷ 56 = 75%, while 5 would give 41 ÷ 55 = 74.55%.
A fixed term: 150 of 210 days, 60 days left. The year will have 270 days, and 75% of 270 is 202.5, so you need 203 days attended in total. That is 203 − 150 = 53 of the 60 days left, leaving 7 you can miss. You finish at 203 ÷ 270 = 75.19%; one fewer day (202) would be 74.81%.
The common mistake: averaging the percentages of your subjects. With 20 of 20 classes in one subject (100%) and 30 of 60 in another (50%), the average of the two percentages is 75%, but you attended 50 of 80 classes, which is 62.5%. Add up the classes, not the percentages, whenever a rule counts “all the subjects taken together”, as the Bar Council of India’s does.
Show Work
Formulas
Attendance Rules in Practice
There is no single attendance rule. Who runs the exam or the school sets it, and the figures below are examples you can type into the calculator, not a rule for your college.
India, school board exams: 75%. The Central Board of Secondary Education’s circular of 4 August 2025 reminds schools that, under Rules 13 and 14 of the CBSE Examination Bye-Laws, “a minimum of 75% attendance is mandatory for students to be eligible to appear for the Board examinations” for Classes X and XII, with a 25% relaxation “only in cases of exigencies such as medical emergencies, participation in national or international sports events, and other serious reasons”, supported by documents. Attendance is counted up to 1 January of the session.
India, law degrees: 70%. Rule 12 of the Bar Council of India’s Rules of Legal Education 2008 bars a student from the end-semester test in a subject unless they attended at least 70% of its classes, moot court exercises, tutorials and practical training taken together. A dean or principal may allow a student with at least 65% in the subject if they attended 70% of classes across all subjects.
United States: chronic absence. US rules usually look at absences rather than a minimum. California’s Education Code §60901(c)(1) defines a “chronic absentee” as a pupil absent on 10 percent or more of the school days in the year. The US Department of Education’s chronic absenteeism data story, from the 2015–16 Civil Rights Data Collection, counts students who missed 15 or more days of school: over 7 million students, 16 percent, about 1 in 6. In a 180-day year, 15 days is 8.33% and 18 days is 10%, so the two measures catch slightly different students.
Colleges and universities write their own ordinances, often with medical or condonation clauses, and some count a two-hour lab as two classes. Use the numbers your institution uses.
About This Calculator
This calculator turns classes attended and classes held into a percentage, then answers the two questions students actually ask: how many classes in a row bring you up to the minimum, and how many you can miss and stay there. Give it the classes left in the term and it works out how many of those you must attend. In School days mode it checks absences against a chronic-absence line and the 15-day federal measure.
Every answer is checked at the edge (one class fewer, one class more), and percentages are compared in whole hundredths so 75% of 56 is exactly 42. It is for college and school students, parents keeping an eye on absences, and teachers or class monitors. Nothing you type leaves your browser.
Related tools: Percentage Calculator, Grade Calculator, and Final Grade Calculator.
Frequently Asked Questions
How do I calculate my attendance percentage?
Divide the classes you attended by the classes held and multiply by 100. 36 attended out of 50 held is 36 ÷ 50 × 100 = 72%. Count every class that was held, including the ones you missed, and nothing that has not happened yet.
How many classes do I need to attend to reach 75%?
Every class you attend also adds one to the classes held, so you need x = (0.75 × held − attended) ÷ 0.25, rounded up. At 36 of 50: (37.5 − 36) ÷ 0.25 = 6 classes in a row, which gives 42 of 56 = 75%. After only 5 you would have 41 of 55 = 74.55%.
How many classes can I miss and still have 75%?
Divide the classes attended by 0.75 and take away the classes held, then round down. At 52 of 60: 52 ÷ 0.75 − 60 = 9.33, so 9 classes. Missing 9 leaves 52 of 69 = 75.36%; a tenth would make it 52 of 70 = 74.29%.
Is 75% attendance compulsory?
It depends on who sets the rule. CBSE’s Examination Bye-Laws (Rules 13 and 14) require 75% attendance to sit the Class X and XII board exams, with a 25% relaxation only for documented exigencies such as medical emergencies (CBSE circular of 4 August 2025). The Bar Council of India’s Rules of Legal Education 2008 set 70% per subject, and a dean may allow 65% if the student has 70% across all subjects. Check your own college’s rule and set that minimum here.
What counts as chronic absence at school?
Definitions differ. California’s Education Code §60901 calls a pupil a chronic absentee when absent on 10% or more of school days, so 18 absences in a 180-day year is exactly 10%. The US Department of Education’s Civil Rights Data Collection counts students who miss 15 or more days: over 7 million students, about 1 in 6, in 2015–16.
How do I use the Attendance Percentage Calculator?
Simply type your numbers and read the result, which refreshes the instant you change something. There is nothing to submit and nothing to wait for.
Do I need to install or sign up for anything?
Not at all — it runs in the browser with nothing to install and no account. After it loads once, it even works without an internet connection.
Is my information private?
Yes. Everything happens in your browser. Nothing you type is sent to a server or saved anywhere.
Common Use Cases
Before the board exams
A CBSE student at 150 of 210 days (71.43%) with 60 days left must attend 53 of them to finish at 203 of 270 = 75.19%.
Planning a day off
At 52 of 60 classes (86.67%) you can miss the next 9 and still sit at 75.36%.
Law school subjects
Under the Bar Council’s 70% rule, 30 of 45 classes (66.67%) needs 5 more in a row: 35 of 50 = 70%.
Parents tracking absences
8 days absent in the first 100 days, with 80 to go: 9 more absences still ends the year at 17 of 180 = 9.44%, under a 10% chronic-absence line.
Teachers flagging students
18 absences in a 180-day year is 10%, chronic absence on California’s definition and past the federal 15-day measure.
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