Why the 75% rule matters
Most polytechnics require 75% attendance for eligibility to sit semester-end examinations. Confirm the exact figure with your college, because departments can apply stricter internal rules and condonation or medical-leave policies vary. The number matters beyond exams too: a shortage discovered late in the semester is difficult to repair, while a shortage found early gives you time to attend extra classes.
Seventy-five percent is a floor, not a comfortable target. A student sitting exactly at 75% has no margin for a sick day or a transport strike. Keeping a few percent in reserve is safer than treating the minimum as the goal.
How the math works
Your attendance percentage is classes attended ÷ total classes held × 100. If you attended 38 of 50 classes, that is 76%. The calculation uses every class counted by your department, including the ones you missed; it is not an average of monthly percentages.
To find your safe margin at a target, the calculator asks how many additional classes could be held — all of them missed — before your percentage falls below the target. At 38 of 50, one more missed class gives 37 of 51, or 72.5%, so you can miss zero more and stay at 75%. Recovering works the other way: from 30 of 50, you need to attend the next 30 classes in a row, because 60 of 80 is exactly 75%.
What to do if you are short
First, confirm the official figures through the free SBTET attendance checker or your college. A hand calculation can be wrong if laboratories, drawing sessions or half-days are counted differently. Then speak to your department early: ask how many classes remain in the semester and whether any condonation process applies.
Attend every remaining class, keep a written record of absences you can support with medical or family documentation, and avoid unofficial shortcuts. No app can change attendance in the portal; only your college can correct a register. Use this calculator for planning, not as a substitute for the official report.
Calculator versus the official report
This page is a planning tool. It does not know your real attendance and it cannot see your college's register. For the figures that count, check your PIN on the official SBTET portal. If the portal shows no record, read the missing-record checklist in the attendance guide and contact your examination section.
Check the number your college sees
The NoteShuttle checker fetches your attendance from the official SBTET portal using your PIN. Free, no login, and your PIN stays on your device unless you choose to save it.