How is "classes needed" computed?

It solves (attended + x) / (total + x) = required for the smallest whole x. Attending fewer resets the math, so treat the streak as mandatory.

What does "can miss" assume?

That total keeps growing while attended stays flat — i.e., consecutive absences starting now. Any presence in between improves the buffer.

My college needs 75% including labs — same math?

Yes if labs count equally as one class each. If practicals carry different weight, compute theory and lab attendance separately.

Attendance Calculator

Turn attended/total classes into a percentage with shortage alerts, required streaks, and safe bunk counts.

Calculate attendance percentage instantly. Free online attendance calculator with shortage warnings, classes needed, and safe bunks.

About Attendance %

Turn attended/total classes into a percentage with shortage alerts, required streaks, and safe bunk counts.

Most institutions demand around 75% attendance before exams. This calculator converts your attended and held counts into a live percentage, then answers the two questions students actually ask: how many classes in a row must I attend, and how many can I afford to skip?

The streak math solves for the smallest run of presences that lifts you to the requirement; the buffer math solves for the largest run of absences that keeps you above it. Both assume no other changes, so recheck after every class.

All computation stays in your browser.

Where it is used

Students tracking the 75% college criterion, planning safe leaves, and recovering from a shortage with exact streak targets.

How to use the Attendance %

Classes Attended — enter the value (e.g. 32).
Total Classes Held — enter the value (e.g. 40).
Required Attendance (%) — enter the value in % (e.g. 75).
Calculate — press the Calculate button to see the result instantly above.

Formula

Short: need = ceil((req x total − 100 x attended) / (100 − req)). Safe: can miss = floor((100 x attended − req x total) / req).

Examples

Example

attended:32

total:40

requiredPercent:75

Result: 80% — Safe, can miss 2 more

Frequently Asked Questions

How is "classes needed" computed?: It solves (attended + x) / (total + x) = required for the smallest whole x. Attending fewer resets the math, so treat the streak as mandatory.
What does "can miss" assume?: That total keeps growing while attended stays flat — i.e., consecutive absences starting now. Any presence in between improves the buffer.
My college needs 75% including labs — same math?: Yes if labs count equally as one class each. If practicals carry different weight, compute theory and lab attendance separately.

Calculator Inputs