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CalcMax

Absence Percentage Calculator

Range: 0 – 366

Range: 1 – 366

Result

3.33%

Absence rate

Days present
232.0
Attendance rate
96.67%

An absence rate is the share of the days someone was due to be in that they were not. This absence percentage calculator takes two numbers off the record you already have — the days absent and the days scheduled — and gives the absence rate, the attendance rate, and the days present. It works the same way for a school term, a work month, a shift pattern or a season, because it never asks what kind of days they are. Both figures come from you: the page does not look up a calendar, so it cannot be wrong about which holidays a particular country or employer observes.

Out of 240 scheduled days, what each number of days absent comes to

Days absentAbsence rateDays presentAttendance rate
00240100
10.4223999.58
52.0823597.92
12522895
241021690

The scheduled total is locked at 240 so that the only thing moving down the table is the number of days missed, and the last column is a hundred minus the second, which is the complement the page is built around. The first two rows are the ones worth reading together: one day out of 240 is 0.42 percent, five days is 2.08 percent, and twelve days is exactly five percent — so a threshold written as a percentage converts into a number of days a record can be checked against. The 240 is a readable figure chosen for this table and is not a statutory number anywhere: China's official monthly average is 20.67 working days and its monthly paid days for wage conversion are 21.75, on an annual working year of 248 days. A reader comparing the two should treat the 240 as the shape of the table, not as a rule. Nothing here involves a calendar: every row divides one count by another.

Formula

Absence rate ＝ days absent ÷ days scheduled × 100　｜　Days present ＝ days scheduled − days absent　｜　Attendance rate ＝ 100 − absence rate

absentDays
The days the person was not there, taken from the attendance record. It may be fractional, because a half day is a real entry on a real timesheet and rounding it away before the arithmetic would lose information the record already has
scheduledDays
The days they were due to be in over the same period, whatever that period is. It is the denominator of the rate, so it must be at least one, and it is a figure you supply rather than one the page derives from a calendar — the page has no way to know which days are working days where you are
absencePercent
The absence rate, the headline figure. It is rounded to two decimals, and every other line on the panel is derived from this rounded value rather than computed alongside it, which is why the two rates on the panel add to exactly a hundred
presentDays
Days scheduled less days absent. It is taken straight from the two inputs and owes nothing to the rounding, so it is the line to check first when two of the figures look inconsistent
presentPercent
The attendance rate: a hundred less the absence rate, taken from the rounded absence rate. It is therefore the exact complement of the headline figure, which is what makes the pair checkable by eye, and it is not the same as days present divided by days scheduled

Use this calculator when you have both counts in front of you and want the ratio: an attendance record for a term or a month, a shift pattern where someone missed a block of shifts, a school year measured against the days it was meant to run. It is also the right page when the two counts come from different systems, because you can enter both rather than reconciling them. It is not the page for turning a date range into a number of working days — it does not touch a calendar, on purpose.

Worked examples

  1. Default: 8 days absent out of 240 scheduled

    1. Absence rate: 8 ÷ 240 × 100 ＝ 3.3333, rounded to 3.33
    2. Days present: 240 − 8 ＝ 232
    3. Attendance rate: 100 − 3.33 ＝ 96.67

    The default figure, and the one to check the panel against: 3.33 plus 96.67 is exactly 100, because the second rate is taken from the rounded first one rather than computed separately. That is the only addition on the page a reader can verify without a calculator, so it is made to work every time. The middle line owes nothing to rounding at all — it is one subtraction from the two numbers typed in.

  2. 36 days absent out of 180

    1. Absence rate: 36 ÷ 180 × 100 ＝ 20.00
    2. Days present: 180 − 36 ＝ 144
    3. Attendance rate: 100 − 20.00 ＝ 80.00

    Three whole figures and no rounding anywhere, which makes this the example to do by hand. One day in five was missed: a fifth of the term is 20 percent, and the attendance rate is the remaining four fifths. It is also the row that shows the rate says nothing about the length of the period — 36 out of 180 and 12 out of 60 give exactly the same two rates but not the same days present, 144 against 48, and only the context tells you which one is the more serious problem.

  3. Half a day absent out of 240

    1. Absence rate: 0.5 ÷ 240 × 100 ＝ 0.20833, rounded to 0.21
    2. Days present: 240 − 0.5 ＝ 239.5
    3. Attendance rate: 100 − 0.21 ＝ 99.79

    The case the decimal place on the absence count exists for. A half day is a real entry on a real record, and it survives into the days present line as 239.5 rather than being rounded away before the arithmetic. The rate itself rounds to 0.21 percent, which is small enough that the attendance rate is the more informative of the two here: 99.79 percent says how close to full attendance the period was.

  4. 1 day absent out of a 5 day week

    1. Absence rate: 1 ÷ 5 × 100 ＝ 20.00
    2. Days present: 5 − 1 ＝ 4
    3. Attendance rate: 100 − 20.00 ＝ 80.00

    A very short period, and the reason the two counts are entered rather than the period being derived: one day off in a five day week is the same rate as 36 days off in 180, and both are correct answers to different questions. Nothing on the page treats a short period as less reliable. If a five day denominator looks odd, that is the reader's judgment about the record, not the arithmetic's.

  5. 12 days absent out of 240: exactly five percent

    1. Absence rate: 12 ÷ 240 × 100 ＝ 5.00
    2. Days present: 240 − 12 ＝ 228
    3. Attendance rate: 100 − 5.00 ＝ 95.00

    The pair the two rates are most often confused over, written out: an absence rate of 5 percent is an attendance rate of 95 percent, and they point in opposite directions. A policy that says attendance must be at least 95 percent and a record that says the absence rate is 5 percent are describing the same person. Both figures are whole numbers and add to exactly 100, which is why this is the row to quote when explaining the difference.

Limitations

Four things are worth knowing. The first is that the page does not know what a working day is. It takes both counts from you and never consults a calendar, so it cannot be wrong about a public holiday, a school inset day or a shift rota — and it also cannot help you produce either count. If a figure you were given was derived from a date range, the working-day assumption behind it is invisible to this page. The second is the rounding convention. The attendance rate is a hundred minus the rounded absence rate, and every other line follows from it. The benefit is that the two rates add to exactly a hundred, which is the check most readers make. The cost is that the attendance rate is not quite days present divided by days scheduled, and the two can differ in the second decimal. The third is the direction of the two figures. An absence rate of 5 percent and an attendance rate of 5 percent describe people at opposite ends of a spectrum, and a report that names only one of them can be read the wrong way. The fourth is that the page stops at the ratio. It says nothing about whether a given rate is acceptable, because that depends on a policy the page has no copy of, and nothing about pay, because a deduction depends on which days were missed and how the employer treats them. A period of leave that is authorised is still an absence by these definitions.

Frequently asked questions

Where do the scheduled days come from?
From you, and that is deliberate. The number of days someone was due to be in is printed on the attendance record, the payslip or the school calendar, so the person asking the question already has it. A page that derived it from a date range would have to decide which public holidays apply, and holidays are national, employer-specific and revised every year — a table written into the page this year would be wrong next year, quietly.
Why do the two rates add up to exactly 100?
Because the attendance rate is a hundred minus the absence rate, taken from the rounded absence rate rather than computed from the two counts. That makes the pair checkable by eye, which matters on a panel where every other figure is the output of an arithmetic step the reader cannot see. The consequence is that the attendance rate is not exactly days present divided by days scheduled; the difference shows up in the second decimal at most.
Can I enter half a day as absent?
Yes. The absence count accepts one decimal place, so a half day or a two-and-a-half day block can be entered as it appears on the record. It also survives into the days present line, which is why that line is shown to one decimal: 0.5 days absent out of 240 gives 239.5 days present. Rounding the input before the arithmetic would throw away information the record already has.
What happens if the days absent are more than the days scheduled?
The page refuses the calculation rather than returning a rate above a hundred. More days missed than the period contained is not a higher absence rate — it means one of the two figures is wrong, and the page will not choose which. Missing exactly all the scheduled days, though, is accepted: an absence rate of 100 percent and an attendance rate of zero is a real answer for someone who was not there at all.
Does the page know about public holidays in my country?
No, and it never reads a date at all. That is why it cannot be wrong about them. For reference, the Chinese statutory figures after the 2025 revision are 248 annual working days, a monthly average of 20.67 working days and 21.75 monthly paid days for wage conversion, and the United States Family and Medical Leave Act defines entitlement as twelve workweeks in a twelve-month period. Both are cited on the page as sources, not used as inputs.
Is a low absence rate automatically good?
The page does not judge that, and cannot. Whether a rate is acceptable depends on a policy — a school's attendance threshold, an employer's absence procedure, a benefit condition — and the page has no copy of yours. It also cannot tell authorised leave from unauthorised absence: a period of approved medical leave is an absence by these definitions. Use the rate as the input to that judgment, not as the judgment.

References

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