75% attendance calculator
Most Indian colleges require 75% attendance to be eligible for exams. This calculator is preset to the 75% threshold so you can quickly check whether you meet the requirement, how many more classes you can miss, and how many you need to attend to get back above the line if you have fallen short. All calculations run in your browser — no data leaves your device.
All calculations run in your browser. Nothing is stored or transmitted.
How the 75% attendance calculator works
The 75% attendance rule means you must attend at least 75 out of every 100 classes held. The calculator checks your current percentage against this threshold using (attended ÷ total) × 100.
To find how many classes you can miss, it calculates the maximum number of future absences that keep your attendance at or above 75%. Each missed class increases the total but not the attended count, pulling the ratio down.
If you are below 75%, the calculator finds the minimum number of consecutive classes you must attend — with zero misses — to cross the 75% line. Attending every class increases both the numerator and denominator, but the numerator grows faster, so the ratio rises.
Worked example
A student has attended 38 classes out of 55 held. The college requires 75% attendance.
Current attendance is (38 ÷ 55) × 100 = 69.09%. The student is below 75% and needs to attend 13 consecutive classes. Verification: (38 + 13) ÷ (55 + 13) × 100 = (51 ÷ 68) × 100 = 75.00%, which meets the requirement.
Common mistakes to avoid
Assuming 75% means 75 classes out of 100
The 75% rule is a ratio, not a fixed count. If 60 classes have been held, you need to have attended at least 45 of them. The calculator handles the ratio correctly for any total.
Not counting practical or lab sessions
Many colleges count lab and practical sessions separately or at a different weight. Check your institution's policy on whether practicals are included in the overall attendance figure.
Ignoring the direction of travel
If your attendance is at 75.5% and falling, you are heading toward a problem. The "classes you can miss" number tells you exactly how much buffer you have before you cross below the line.
Waiting until the end of the semester
Attendance is easier to maintain than to recover. Once you are below 75%, the number of consecutive classes needed to recover grows quickly, because each missed class makes the denominator larger.