Overview

The Attendance Rate Calculator takes the total number of classes in a term and the number you have missed, then shows your attendance rate and how many more absences you can afford before failing. Korean universities commonly assign an F regardless of exam scores when absences exceed one third of all classes (attendance below 2/3), and elementary through high schools require attendance on at least 2/3 of school days for promotion and graduation. Check your remaining margin before scheduling hospital visits, interviews, or trips during the term.

Formula

Attendance rate (%) = classes attended ÷ total classes × 100

Maximum allowed absences = floor(total classes × (1 − required rate))
Remaining allowed absences = maximum allowed absences − current absences

Example: 15 classes, 2/3 rule (≈66.7%)
→ maximum absences = floor(15 × 1/3) = 5
→ with 2 absences so far, you can miss 3 more

How to Use

1. 1Enter the total number of classes in the term — a once-a-week course over 15 weeks is 15 classes, twice a week is 30.
2. 2Enter how many classes you have missed so far, converting tardies if your syllabus counts them (e.g. 3 tardies = 1 absence).
3. 3Select the required attendance rate from your school regulations or syllabus (2/3, 3/4, 4/5, or 9/10).
4. 4Your attendance rate, maximum allowed absences, and remaining allowed absences are calculated automatically.

Tips

• ✔The most common university F rule in Korea is missing more than one third of classes, but many courses require 3/4 attendance instead — always check the syllabus for each course.
• ✔Watch tardy-conversion rules: if 3 tardies count as 1 absence, accumulated lateness alone can push you over the limit.
• ✔Excused absences (official events, illness with documentation) are often counted as attendance — confirm the policy and submit documents before or right after missing class.
• ✔When your remaining allowance approaches zero, you must attend every remaining class — keep a buffer for exam season or job interviews.

FAQ