Attendance percentage formula
Divide classes attended by total classes held, then multiply by 100. If you attended 42 of 50 classes, the result is 84%.
Estimating classes needed
To reach a higher target, each future attended class increases both attended classes and total classes. The calculator solves for the smallest whole number of consecutive classes needed.
Institution rules matter
Some colleges exclude cancelled classes, medical leave, labs, or particular activities. Use your institution portal as the official attendance record.
Use the tool as a planning aid
The calculator is most useful for planning before you are close to a deadline. It can show whether a target is mathematically reachable under the assumptions entered.
Try the calculator
Use the calculator below when you want to apply the formula to your own numbers.
Open Attendance Calculator →Methodology: QuickSolve guides explain common mathematical formulas in plain language. Where institutions, lenders, employers or accounting systems use their own rules, those official rules take priority.