Attendance Percentage Calculator

How to calculate attendance percentage

Attendance % = attended ÷ held × 100(1)

Divide the classes you attended by the classes that were held, and multiply by 100. Attending 41 of 60 classes is 41 ÷ 60 × 100 ≈ 68.33%. "Held" means the classes that have actually taken place so far — not the number on the term's timetable — and both numbers must count the same thing: periods with periods, or days with days.

Whether the figure is worked out per subject or across all subjects depends on your school or college; the calculator works for either, one subject at a time or the total (see what your school or college's rule may add).

75% attendance calculator: classes you need to attend

Below the target, the number that matters is how many classes you have to attend in a row to get back to it. With a target of T%, that is

(T × held − 100 × attended) ÷ (100 − T), rounded up

At 41 of 60 and 75%: (75 × 60 − 100 × 41) ÷ 25 = 400 ÷ 25 = 16. Attend the next 16 and you are at 57 ÷ 76 = 75% exactly. Rounded up, always: stopping one class short leaves you below the line, and the calculator prints that one-short figure in its working so you can see it.

At 75% the formula collapses to a shortcut: 3 × held − 4 × attended. For 30 of 45 that is 135 − 120 = 15, and 45 ÷ 60 = 75%.

Planning a whole term

This table answers a different question from the calculator. It is for a term whose total you know in advance: the fewest classes to attend out of all of them, and the absences that leaves. The calculator works from where you stand today — 60 of 60 so far can miss the next 20 classes, while a 60-class term allows 15 absences in total.

At 85% the absences allowed are the classes in the term minus that last column: a 60-class term allows 9 (51 to attend), and a 90-class term allows 13.

How many classes can you miss and stay at 75%?

Above the target, the room you have is

(100 × attended − T × held) ÷ T, rounded down

At 50 of 60 and 75%: (5,000 − 4,500) ÷ 75 ≈ 6.67, so 6. Missing six gives 50 ÷ 66 ≈ 75.76%, still above the line; a seventh absence gives 50 ÷ 67 ≈ 74.63%, below it. The 75% shortcut is (4 × attended − 3 × held) ÷ 3, rounded down.

"The next 6" means the next six classes in a row. Every class you attend in between adds to both numbers and earns more room, so work it out again after each class rather than spending the whole allowance at once. When the answer is 0 — 31 of 41 is 75.61%, and one absence makes it 31 ÷ 42 ≈ 73.81% — the calculator says so plainly.

If you know how many classes are left — this week, or before the attendance list is drawn up — the question changes to how many of those you must attend: 75% of (held + classes left), rounded up, minus the classes you have attended. At 50 of 60 with 10 classes left this week, 75% of 70 rounds up to 53, so attend 3 of the 10 and you can skip 7 — more than the 6 in a row, because the classes you attend earn room for the rest.

75% attendance in days: a month or a semester

The arithmetic is the same with days instead of classes: multiply the working days by 0.75 and round up. A month with 26 working days needs 26 × 0.75 = 19.5, so 20 days. Nineteen would be 73.08%.

The calculator's answer is in classes. To turn it into days, divide by your classes per day and round up: 16 classes at 4 a day is 4 full days of attending every class, and 21 at 4 a day is 5.25, so 6 days.

For a whole semester, use the term table above — a 90-day term needs 68 days and allows 22 absences — or work out 0.75 × the days in the term, rounded up. To see where you stand partway through, enter the days so far into the calculator as attended and held.

Other targets: 85%, 80% or your own

The Target field takes any figure up to two decimal places. Some universities set a higher bar than 75%, such as 85%: at 60 of 80 that needs 54 more classes, because 114 ÷ 134 ≈ 85.07% while 53 would stop at 113 ÷ 133 ≈ 84.96%. A decimal target works the same way — 29 of 40 is exactly 72.5%, on the line with nothing to spare.

Some calculators work this out in floating point and are one class off at 80%, 85% and 90%. For example, 0 of 1 at 80% needs 4 more classes (4 ÷ 5 = 80%), not 5. This one uses whole-number arithmetic at any target, and shows the class before the answer so you can check it.

Why 74.9% is not 75%

A figure that rounds to 75 is not 75. The calculator compares your attendance with the target exactly, before anything is rounded for display, and it never rounds a figure across the target: 5,999 of 7,999 is 74.996…%, and it shows 74.99% with "below 75%", not a 75% that would read as a pass. The figures in its working follow the same rule, and a "≈" marks every one that is rounded.

Whether your institution rounds 74.5% up to 75% is its rule, not arithmetic. Some may; do not count on it without checking the regulations.

When the target cannot be reached

At a 100% target, one absence is permanent: nothing you attend later removes it from the count, so the calculator says the target is out of reach instead of printing an endless number of classes.

The other case is a number of classes needed that is larger than the classes left in the term — the calculator adds a note when the answer is more than the classes held so far. If that is where you are, talk to your department early. Many institutions have a condonation or medical process, and it is easier to use before the term ends than after.

What your school or college’s rule may add

For CBSE board examinations, the rule is published: CBSE's circular of 4 August 2025 restates that under Rules 13 and 14 of its Examination Bye-Laws a minimum of 75% attendance is mandatory to appear for the Board examinations, with a 25% relaxation only for exigencies such as medical emergencies or national and international sports events.

Beyond that, 75% is a common minimum in Indian schools and colleges; some universities set a higher bar, such as 85%. Check your institution's regulations for the details that change the arithmetic:

• Per subject or overall. Many institutions apply the minimum to each subject separately. Work each one out on its own.
• Labs and practicals are often counted separately from lectures.
• Half-days. The calculator counts whole classes. To count half-days, double both numbers: 20.5 of 30 days becomes 41 of 60.
• Condonation. Many institutions can excuse a shortfall for documented reasons. The terms are theirs to set.