Check attendance after each session in your planned order using the inputs on this page.
Study & Grades
Find how many classes you can safely miss
Use your current attendance record and minimum requirement to check immediate safe absences or plan within a future block of classes.
Calculation check
This result assumes each future class has the same attendance weight. Use the held and attended totals from the official record, and verify any separate lecture, lab, leave or eligibility rules.
Check attendance after every planned session
Use the current held, attended and target fields above. Enter the actual order you want to test: A = attend, M = miss, C = cancelled or excluded from both counts. The upcoming-block field above does not determine the length of this separate sequence.
Immediate allowance and future-block allowance answer different questions
Enter current held and attended counts from the same reporting date, plus the attendance target that applies to that record. The original form checks immediate consecutive absences and, optionally, absences within a future block. The sequence checker tests what happens after each planned session, so a passing final percentage cannot conceal an earlier dip.
Every counted class has equal weight. Keep subjects, lectures and labs separate when they have separate requirements. A mathematical allowance does not grant permission to miss a class or establish examination eligibility.
Immediate consecutive absences
For H classes held, A attended and target rate T, immediate absences are max(0, floor(A ÷ T − H)) when the current record meets the target. The next classes are all assumed missed. With 34 attended out of 40 and a 75% target, five consecutive absences leave 34/45 ≈ 75.56%; six leave 34/46 ≈ 73.91%. The allowance is five.
At exactly 30/40 = 75%, the next absence falls below the target. If the record is already below target, the immediate allowance is zero. With no classes held, attendance is undefined; missing the first counted class creates 0% attendance. At a 100% target, an existing counted absence cannot be repaired to an exact 100% merely by attending more ordinary sessions.
Absences inside a future block
For N upcoming classes, assume every class not missed is attended. First check the best possible final record, (A + N)/(H + N). If that remains below target, the block cannot recover even with full attendance. Otherwise the maximum block absences are min(N, max(0, floor(A + N − T × (H + N)))).
Starting at 34/40, ten upcoming classes permit six absences if four are attended: the final record is 38/50 = 76%. This is an end-of-block result. It does not imply all six absences can occur first without crossing below 75%.
Test the order, not just the total
Use A for an attended session, M for a missed counted session, and C for a cancelled/excluded session. C changes neither count; use that treatment only when the official record excludes the session. Enter 1–200 entries separated by spaces or commas. Positions include C entries. This separate sequence uses its own length, independently of the original upcoming-block field.
| Sequence from 34/40 | Intermediate check | Final record |
|---|---|---|
| M M M M M M A A A A | First below 75% at position 6: 34/46 | 38/50 = 76% |
| A A A A M M M M M M | No below-target record in the sequence | 38/50 = 76% |
The checker reports the starting status, first below-target position, lowest percentage after an entry and the full path. A record that starts below target is identified separately. Target comparisons use the exact class counts and entered decimal target before display rounding. Percentages are displayed to at most six decimals.
This helps inspect continuous or intermediate checks but does not know your review dates, compulsory sessions or permitted absences. It neither schedules classes nor writes attendance into a student portal. Editing the starting record or sequence invalidates the displayed plan.
Recovering a below-target record
Starting at 20/30, a block of 20 future classes can finish at 38/50 = 76% with 18 attended and two missed. The first two sessions cannot necessarily be missed while staying above target: the record first needs to recover. Use the sequence checker for an actual order, or the Attendance Shortage Calculator for consecutive recovery and fixed-term feasibility.
Reliable inputs and institutional rules
Held and attended must be whole numbers from 0–1,000,000, with attended no greater than held. The target is greater than zero and no more than 100%. Upcoming classes may be zero or blank when only the immediate result is needed. The separate sequence requires entries and accepts a plain decimal target with up to 18 decimal places.
Use underlying counts, not a rounded portal percentage. Two records can both display 75% yet have different absence allowances. Do not count scheduled classes as already held, automatically exclude approved leave, or change cancelled-session treatment without checking the official denominator.
The University of Nebraska–Lincoln’s class attendance policy illustrates that individual faculty attendance rules matter. Confirm your own target, reporting date, compulsory sessions, leave rules, rounding and review checkpoints. For multiple current subject records, use the Subject Wise Attendance Calculator.
Inputs stay in the browser calculation and are not saved as attendance records. The tools do not model weighted hours, condonation, disciplinary decisions or official eligibility.