Attendance
Attendance rate from days attended and days enrolled
Divide the days attended by the days enrolled. With 172 attended and 180 possible the rate is 0.9555555555555556, which is 95.56%.
The Formula
rate = present / possible
Divide the days attended by the days enrolled. With 172 attended and 180 possible the rate is 0.9555555555555556, which is 95.56%.
| Symbol | Meaning | Unit | Notes |
|---|---|---|---|
| present | Days attended | days | Sessions the student was recorded present, counted over the same window as the denominator. |
| possible | Days enrolled | days | Sessions the student could have attended. Not calendar days, and not the class total if the student joined late. |
| r | Attendance rate | ratio | A fraction between 0 and 1; multiply by 100 for a percentage. 172 / 180 = 0.9555555555555556. |
What Each Symbol Means
presentdays
Days attended
Sessions the student was recorded present, counted over the same window as the denominator.
possibledays
Days enrolled
Sessions the student could have attended. Not calendar days, and not the class total if the student joined late.
rratio
Attendance rate
A fraction between 0 and 1; multiply by 100 for a percentage. 172 / 180 = 0.9555555555555556.
See It Worked With Real Numbers
A formula on its own does not tell you which number goes where. The how to calculate an attendance rate page applies this equation to a concrete case, shows every intermediate step, and names the mistakes that produce a wrong answer even when the algebra is right.
Where This Formula Appears
This equation is the working core of How To Calculate An Attendance Rate, filed under Education. Every number the guide produces comes from substituting into this one line.