Study Attendance calculator
Enter the classes you attended and the total held. See your percentage and exactly how many classes you need for your target.
Runs in your browser. Nothing you type leaves your device.
Attendance formulas
- Attendance % = attended ÷ total × 100
- Classes needed to reach target p = ⌈(p × total − attended) ÷ (1 − p)⌉
- Classes you can miss = ⌊attended ÷ p − total⌋
Here p is the target as a decimal (75% = 0.75). Planning your week around classes? Try the timetable maker or the student planner.
FAQ
How do I calculate my attendance percentage?
Divide the classes you attended by the total classes held, then multiply by 100. For example, 42 attended out of 53 is 42 ÷ 53 × 100 = 79.2%.
How many classes do I need to attend to reach 75%?
Use the formula x = (0.75 × total − attended) ÷ 0.25, rounded up. With 30 attended out of 45, you need (33.75 − 30) ÷ 0.25 = 15 more classes in a row. The calculator does this for any target.
How many classes can I miss and stay above 75%?
Use y = attended ÷ 0.75 − total, rounded down. With 42 attended out of 50, you can miss 42 ÷ 0.75 − 50 = 6 classes.
Do cancelled classes count?
Usually not: a class that did not happen should not be in the total. Check your college rules. In the ClassTrack app you can mark a class as cancelled so it never counts against you.
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Built and checked by Prince Kumar. Last reviewed 2026-10-20.