🏫 Attendance Percentage Calculator
Enter the number of school days so far (or in the year) and the days missed. You get the attendance rate and how close you are to the 10% chronic absence line.
How the Attendance Percentage Calculator works
Days attended are divided by total days. Many US states and the US Department of Education define chronic absenteeism as missing 10% or more of school days for any reason.
Step-by-step calculation
- 1Enter total school days and days absent.
- 2Divide days attended by total days.
- 3Compare with the 10% chronic absence line.
Worked example
Missing 9 of 180 school days is 171 ÷ 180 = 95% attendance. The 10% line is 18 days, so 9 more absences would reach it.
Attendance Percentage Calculator examples
| Total school days | Attendance rate |
|---|---|
| 90 | 90% |
| 135 | 93.33% |
| 180 | 95% |
| 225 | 96% |
| 270 | 96.67% |
Other inputs kept at the calculator's default values. Results calculated by this calculator.
Why use an Attendance Percentage Calculator?
Track attendance before it affects grades or rules.
Important factors that can affect your results
- Excused vs unexcused absences.
- Half days and tardies.
- School-specific rules.
Frequently asked questions
Do excused absences count?
For chronic absenteeism, yes — most definitions count excused and unexcused absences.
What about half days?
Enter them as 0.5.
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Last reviewed November 2026 · How we build and check our tools · Report a problem