Attendance Calculator
Work out your attendance percentage.
Results update as you type.
How it works
An attendance calculator tells you what share of your classes you have actually shown up to, expressed as a clean percentage, and how many sessions you have missed. Enter the number of classes you attended and the total number held, and the tool divides one by the other, multiplies by 100, and also reports the gap as missed classes. It is the fast way to check where you stand against an attendance requirement without counting on your fingers through a term's worth of sessions. Attendance percentages matter far more than students sometimes realise. Many courses, scholarships, visa conditions and professional programmes set a minimum — often 75, 80 or 90 percent — below which you risk penalties, loss of eligibility, or being barred from an exam. Seeing that you have attended 27 of 30 classes, a 90 percent rate with 3 missed, tells you immediately whether you have room to spare or need to attend everything remaining. The calculator is equally useful looking forward: knowing your current rate and requirement, you can work out how many more sessions you can afford to miss, or how many you must attend to climb back above a threshold. Teachers and administrators use it to monitor class participation and flag students at risk, while parents use it to keep track of a child's schooling. Because it is a simple ratio, it works for any period — a single module, a semester, or a whole year — as long as the two numbers cover the same span.
attendance rate = (classes attended ÷ total classes) × 100
Attendance is a ratio: the classes you attended divided by the total classes held expresses the fraction of sessions you were present for, and multiplying by 100 turns that fraction into a percentage. The missed count is simply the total minus those attended. Because it is a straightforward proportion, the result is only meaningful when both numbers cover the same period and count sessions the same way — mixing a term's attendance with a year's total, or counting cancelled classes inconsistently, distorts the rate. A total of zero classes leaves the rate undefined, since you cannot take a fraction of nothing.
Source:Standard attendance-rate definition
We review all our tools from time to time to ensure accuracy.
Worked example
How to use this calculator
- 1
Enter your values
Enter classes attended and total classes held.
- 2
Adjust the options
Fine-tune any options to match your situation.
- 3
Read your result
Attendance rate updates instantly as you type — no button to press.
Frequently asked questions
How many classes can I miss and stay above my requirement?
First find your requirement — commonly 75, 80 or 90 percent — then work out the maximum misses it allows across the full number of sessions. For a 75 percent rule over 40 classes, you must attend at least 30, so you can miss up to 10. Enter your current attended and total figures to see where you stand now, then subtract to find how many of the remaining classes you can still afford to skip.
What counts as a class for this calculation?
Count each scheduled session your institution treats as gradeable attendance — typically every lecture, seminar, lab or tutorial on the register. Be consistent: if a class was officially cancelled and does not count against anyone, exclude it from both your attended figure and the total. Excused absences are trickier, since some schools count them as present and others as missed. Check your institution's policy so the numbers you enter match how your official attendance record is calculated.
Do excused absences lower my attendance?
It depends entirely on your institution's policy. Some schools count an excused absence — for illness with a note, say, or an approved commitment — as present, so it does not reduce your rate. Others record it as an absence that still counts against the total, meaning it lowers your percentage even though it will not incur a penalty. Because practice varies widely, confirm how your school treats excused absences before deciding whether to include them as attended in this calculator.
How do I raise my attendance percentage?
The only way to raise a lagging rate is to attend more of the remaining sessions, since each class you make lifts the ratio. The effect is larger when fewer classes have been held, because each session carries more weight in a smaller total. Use the calculator to test scenarios: enter the attendance you would have after attending the next several classes to see how quickly your percentage recovers and whether it can reach your required threshold in time.
Why does my total classes need to be more than zero?
Attendance is your attended classes as a fraction of the total held, and dividing by zero is undefined — if no classes have been held, there is no meaningful percentage to report, so the calculator returns no result until you enter a positive total. This simply reflects that a rate cannot exist before any sessions have taken place. Once at least one class has been held, the calculation works normally and updates as you add attended and total figures.