Skips depend on what is already on the register
“How many classes can I miss?” is not a fixed fraction of the semester once you have a history. The honest inputs are classes attended, classes already held, classes still on the timetable, and the target percentage. This page opens on that mode. The calculator ceilings the required number of presents for the final total, then subtracts from the presents you could still collect if you attended everything left.
Worked numbers that match the live logic: 42 attended, 50 held, 20 remaining, 75% target. The term will close at 70 sessions. 75% of 70 is 52.5, ceiled to 53 required presents. You can finish with at most 42 + 20 = 62 presents, so 62 − 53 = 9 misses, and you should attend 11 of the 20. A second case: 30 attended, 50 held, 30 remaining, 75%. Final total 80; 60 presents required; 30 + 30 − 60 = 0 misses. You must attend every remaining class.
Travel, internships, and stacked deadlines
Students usually ask this question before a wedding, a conference, or a take-home exam week. Count the sessions that overlap the trip first, then see whether the miss budget covers them. If the trip needs 6 skips and the tool returns 4, you need a timetable change, a recorded session if your school counts it, or a documented leave process — not a hope that rounding will save you.
Remember that “remaining” means sessions that will still be marked. Guest lectures added later increase the denominator. Cancelled classes decrease it. Re-run the numbers when the timetable shifts. If your target is not 75%, set 80% or 85% before you trust the miss count; the same 20 remaining classes can flip from “miss 9” to “miss 5” when the bar moves.
For the opening-of-term view (no absences yet), the homepage table uses floor(N × (100 − t) / 100). That table is a ceiling on bunks for a clean slate, not a remaining budget. Combine both: start with the table in August, then switch to this remaining-class calculator after the first month. More context: attendance percentage formula and threshold pages for 75% and 85%.
Bunks, medical days, and the same remaining count
The calculator does not know why a class will be missed. Six wedding-related skips and six fever days hit the ratio the same way until the office recodes them. If medical leave is later excluded from “held”, your remaining budget grows; until then, plan as if those days are ordinary misses. Keep screenshots of the portal before and after a correction so you can re-enter the new attended/held pair.
Group projects sometimes have optional working sessions that still appear on the biometric machine. If those scans feed the official total, they belong in this tool. If they are informal, leave them out. Mixing unofficial scans with official lectures is the usual way a “I can miss 9” result disagrees with the dean’s list.