Attendance Percentage Calculator
An attendance percentage calculator works out your attendance from the classes held and attended — and tells you how many classes you can still miss, or must attend, to stay above the 75% mark.
Enter two numbers, set your target, and see exactly where you stand and what to do next.
—
This checks one student's attendance
This calculator is for a single student to check their own percentage. Schools that need to mark and report attendance for every student — with automatic absent alerts to parents — use SchoolDeck attendance; colleges and universities use CampusAlly attendance for the 75% eligibility register. Need to convert marks to grades instead? Try the CBSE Grade Calculator.
How it works
Check your attendance in four steps.
-
1
Enter classes held
Type the total number of classes or lectures conducted so far this term or year.
-
2
Enter classes attended
Type how many of those classes you were actually present for.
-
3
Set your target
Pick 75% (the common rule), 80%, or set a custom target your institution uses.
-
4
Read your result
See your percentage, whether you're safe, and exactly how many classes you can miss or must attend.
How attendance percentage is calculated
The core formula is simple: divide the classes you attended by the total classes held, then multiply by 100.
The formula
Attendance % = (Classes attended ÷ Total classes held) × 100
Example 1 — your current percentage
If 80 classes were held and you attended 64, your attendance is 64 ÷ 80 × 100 = 80% — comfortably above the 75% mark.
Example 2 — how many can you miss?
With 64 attended, the most total classes you can have and still sit at 75% is 64 ÷ 0.75 = about 85 classes. Since 80 have already been held, you can miss roughly 5 more upcoming classes before you slip below 75%.
Example 3 — how many must you attend to recover?
Say 80 were held and you attended only 56 (70%). To reach 75% you must attend the next several classes without missing any. Solving (56 + x) ÷ (80 + x) = 0.75 gives x = 16 classes in a row. The calculator works this out for your own numbers.
| Held | Attended | Attendance | vs 75% |
|---|---|---|---|
| 80 | 64 | 80% | Can miss ~5 |
| 100 | 75 | 75% | On the line |
| 80 | 56 | 70% | Attend 16 |
| 120 | 102 | 85% | Can miss ~16 |
The 75% attendance rule in India, explained
Across Indian schools, colleges and universities, a minimum attendance threshold decides whether a student is allowed to sit the final or board examination. The most common figure is 75%. It appears in CBSE's examination bye-laws, in most university ordinances, and in the norms that AICTE-regulated technical institutions follow. Falling below it can mean being marked as a non-eligible candidate, repeating the year, or needing a formal condonation.
Why institutions enforce it
The rule exists to ensure students have actually completed enough of the taught course to be examined fairly on it. Because the threshold is checked at the end of a term against every scheduled class, students who track their attendance through the year rarely get a nasty surprise — which is exactly what this calculator is for.
The two questions students actually ask
Beyond "what is my percentage", the two practical questions are: how many more classes can I miss and still be safe, and if I've already dropped below the line, how many must I attend without a break to climb back. The first uses the rule that your maximum allowable total is your attended count divided by the target fraction. The second solves for how many consecutive future classes lift you back to the target. This tool answers both automatically.
Medical leave, condonation and relaxation
Most institutions allow some relaxation of the 75% rule for genuine reasons — documented illness, a death in the family, or participation in approved sports and events. The relaxed floor is often around 60–65%, granted at the discretion of the principal, head of department or examination committee, usually against supporting documents. The base calculation here counts every held class equally; if you have an approved exemption, apply your institution's relaxed figure as your custom target.
School vs college: same maths, different stakes
The percentage formula is identical whether you're in Class 9 or a final-year degree. What differs is the consequence and how attendance is recorded. School attendance is usually a daily present-or-absent mark; college and university attendance is often counted per lecture or per subject, so a student can be above the threshold overall but short in a single subject. If your institution checks subject-wise, run the calculator once per subject.
From a personal check to an institution-wide register
Checking your own attendance is a quick sum. For a school or college, keeping the daily register for hundreds of students, totalling each one's percentage, flagging those approaching the limit, and alerting parents the same day a student is absent is a continuous job. Schools use SchoolDeck's attendance module for this, and colleges use CampusAlly's attendance and eligibility register, both of which compute the 75% status for every student automatically.
For your own numbers right now, use the calculator at the top of this page.
Frequently asked questions
Attendance percentage calculator — FAQs
How do I calculate attendance percentage?
+
Attendance percentage is the number of classes you attended divided by the total classes held, multiplied by 100. For example, if 80 classes were held and you attended 64, your attendance is 64 ÷ 80 × 100 = 80%. This calculator does the maths instantly and also shows how many classes you can miss while staying above your target.
What is the formula for attendance percentage?
+
Attendance percentage = (Classes attended ÷ Total classes held) × 100. To find how many classes you can still miss and stay at a target T%, the rule is: maximum total classes you may have = attended ÷ (T ÷ 100). The calculator applies both formulas for you.
What is the 75% attendance rule?
+
Many Indian schools, colleges and universities require a minimum of 75% attendance to be eligible to sit final or board examinations. CBSE and most universities, and AICTE-regulated technical courses, commonly use this 75% threshold, though some institutions allow relaxation for medical or genuine reasons. Always confirm the exact rule with your own institution.
How many classes can I miss and still have 75% attendance?
+
It depends on how many classes have been held and how many you have attended. If you have attended A classes, the maximum total classes you can have while staying at 75% is A ÷ 0.75. Subtract the classes already held from that to see how many more you can miss. This calculator computes the exact number for your figures.
How many classes must I attend to reach 75%?
+
If your attendance is below the target, you must attend several future classes in a row without missing any. The number needed is found by solving (attended + x) ÷ (held + x) = target. The calculator works out the exact number of consecutive classes you must attend to recover to 75% or your chosen target.
Is this attendance calculator free?
+
Yes. The calculator is completely free, needs no sign-up, and runs entirely in your browser, so the figures you enter are never uploaded or stored. You can use it as many times as you like on any phone or computer.
Does the 75% rule count medical leave?
+
Policies vary. Many institutions count every scheduled class in the denominator but allow a relaxation — often down to 60–65% — for documented medical leave or other genuine reasons, on the principal's or head's approval. The base calculation here treats all held classes equally; check your institution's rules for any approved exemption.
Does this tool track attendance for a whole class or school?
+
No. This is a personal calculator for one student's figures. Schools and colleges that need to mark, total and report attendance for every student — with automatic alerts to parents when a student is absent — use the attendance modules in SchoolDeck (schools) and CampusAlly (colleges), which keep the daily register and the percentages automatically.
More free school tools
Calculate, convert, generate — all free.
Chasing attendance registers every term? Let the system keep count.
SchoolDeck marks attendance on mobile or biometric, totals every student's percentage against the 75% rule, and sends parents an absent alert the same day. Used by 500+ schools across India.