Attendance Rate Calculator Formula
Understand the math behind the attendance rate calculator. Each variable explained with a worked example.
Formulas Used
Attendance Rate
attendance_rate = (days_present / total_days) * 100Days Absent
days_absent = total_days - days_presentAbsence Rate
absence_rate = ((total_days - days_present) / total_days) * 100Variables
| Variable | Description | Default |
|---|---|---|
days_present | Days Present | 165 |
total_days | Total School Days | 180 |
How It Works
How to Calculate Attendance Rate
Attendance rate is the percentage of school days a student was present.
Formula
Attendance Rate = (Days Present / Total School Days) x 100
Chronic absence is defined as missing 10% or more of school days (attendance below 90%).
Worked Example
A student is present 165 out of 180 school days.
- 01Attendance rate = (165 / 180) x 100 = 91.7%
- 02Days absent = 180 - 165 = 15
- 03Absence rate = (15 / 180) x 100 = 8.3%
Frequently Asked Questions
What is chronic absenteeism?
Chronic absence means missing 10% or more of school days. For a 180-day year, that is 18+ absences. It significantly impacts academic performance.
What attendance rate do most schools require?
Most schools expect 90%+ attendance. Some require 95%+ for certain privileges. Below 90% may trigger intervention.
Do excused absences count?
For attendance rate calculations, both excused and unexcused absences count. The student misses instruction regardless of the reason.
Ready to run the numbers?
Open Attendance Rate Calculator