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Attendance Calculator

Check your attendance and classes needed for a target.

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Enter the attendance target that applies to you. This is a class-count calculation, not a statement of your institution’s eligibility rules.

Count completed classes you attended.

Include attended and missed classes.

Required: 0–100%, up to two decimal places.

Use a known schedule to check whether your target is still possible.
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Last reviewed: · Testing methodology

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How to use

Enter completed class counts and your target to see catch-up and absence scenarios.

1

Enter completed classes

Enter attended and conducted class counts. Use one consistent unit: classes, not a mixture of classes and hours.

2

Set your target

Enter the percentage that applies to you. Add remaining classes only if you know the schedule; no university threshold is assumed.

3

Read the scenario

Calculate to see the current fraction, consecutive attendance needed and maximum extra absences. A target may be impossible within the remaining schedule.

Examples and checks

How this tool works

Current percentage is A/T × 100. For a target fraction q between 0 and 1, catch-up is max(0, ceil((qT − A)/(1 − q))). When already at target, missable classes are floor(A/q − T). Zero conducted classes and 0%/100% targets use explicit boundary rules.

  • Engine: Integer class counts and exact basis-point threshold arithmetic
  • Supported input: whole attended and conducted class counts, 0–100% target with up to two decimals, optional whole remaining-class count
  • Output: attendance percentage, class counts and formula breakdown
Input
30 attended, 50 conducted, target 75%
Output
60% current attendance; 30 consecutive attended classes reach 60/80 = 75%.

Limits and questions

Inputs are processed in your browser. Analytics and advertising can make separate network requests.

Limits, edge cases, and troubleshooting

Use the remaining-class field to distinguish eventual mathematical catch-up from what is possible this term. With only 20 classes left in this example, the maximum is 50/70 = 71.4286%.

  • Class-count inputs are limited to one billion to keep results within supported arithmetic bounds.
  • No university rules, excused-absence policy or subject eligibility are inferred.
  • Catch-up assumes every additional class is attended; display rounding never determines eligibility.

When to use another workflow

Use the institution's official attendance portal when hours, excused sessions, practicals or separate subject requirements affect eligibility.

Verification

Implementation checked on 2026-09-16. Unit tests and local browser checks covered 30/50 at 75% (30 catch-up classes), zero conducted classes, 0% and 100% targets, invalid counts and a finite remaining schedule. Narrow layouts and a keyboard-only calculation were checked.

Testing methodology

Frequently asked questions

Is 75% a universal attendance requirement?
No. The example uses 75% only to demonstrate the arithmetic. Enter your own target and check subject-specific, excused-absence and eligibility rules with your institution.
Can I recover exact 100% after missing a class?
No finite number of additional attended classes removes an earlier absence from the conducted total. If every conducted class was attended, catch-up is zero. If no classes were conducted, one attended class establishes a percentage.