Absence Percentage Calculator (absence rate & lost working time)

Understanding the absence percentage calculator — concept and principle

This calculator turns absent days into an absence rate, the share of scheduled working time lost, plus attendance rate, days per employee, hours lost and pay cost. HR teams and managers use it to track unplanned absence and compare teams of different sizes fairly.

Days lost out of days scheduled — with the default inputs: 2.09%.

How it is calculated

Scheduled days = number of employees × scheduled working days per employee
Absence rate (%) = total days absent ÷ scheduled days × 100
Attendance rate (%) = 100 − absence rate
Average days absent per employee = total days absent ÷ employees
Working hours lost = days absent × hours per working day
Pay cost of absent days = days absent × pay cost per employee per day

Count only days people were expected to work. Booked holidays, public holidays and weekends are not absences and should not be in either number.

The principle

A raw count is hard to compare: 120 days means something different in a team of 10 than in a team of 200. Dividing by scheduled time gives a rate comparable across teams and periods. The U.S. Bureau of Labor Statistics uses the same idea in hours, the lost worktime rate: hours absent as a percentage of hours usually worked.

Worked example

Defaults: 25 employees, 230 scheduled working days each, 120 days absent, 8 hours per day, pay cost 200 per employee per day.

Scheduled days = 25 × 230 = 5,750.
Absence rate = 120 ÷ 5,750 × 100 = 2.09%.
Attendance rate = 100 − 2.09 = 97.91%.
Average days absent = 120 ÷ 25 = 4.8 days per employee.
Hours lost = 120 × 8 = 960.
Pay cost = 120 × 200 = $24,000.

Each point is the calculator re-run with only “Number of employees” changed; the gold point is the default example. Change the inputs above and this chart follows your numbers.

Number of employees	Absence rate
6.25	8.35%
12.5	4.17%
18.8	2.78%
25	2.09%
31.2	1.67%
37.5	1.39%
50	1.04%

How to read the result

Compare with your own past periods first. The BLS reported a lost worktime rate of 1.9% for US full-time wage and salary workers in 2021, a rough reference, not a target. A rising trend or one team far above the rest says more than a single number.

Common mistakes

Counting holidays or weekends as absence, which inflates the rate.
Using calendar days instead of scheduled working days.
Treating part-time staff as full-time employees; use full-time equivalents.
Taking the pay cost as the full cost. Overtime, temporary cover and lost output usually add to it.

Keep in mind: The rate says nothing about why people were absent. Use it to spot patterns, then talk to people, and follow your local employment and privacy rules when recording health-related absence.

Frequently asked questions

What is a normal absence rate?

It varies by sector and country. US BLS data for 2021 put the lost worktime rate for full-time workers at 1.9%, so a few percent is common.

Should long-term sickness be included?

Include it if it was unplanned absence from scheduled work, but also look at it separately so it does not hide short-term patterns.

How is this different from the Bradford factor?

The absence rate measures total time lost. The Bradford factor weights frequent short spells more heavily.

Sources: U.S. Bureau of Labor Statistics, Current Population Survey, Table 47 "Absences from work of employed full-time wage and salary workers by occupation and industry", 2021 annual averages

Checked 9 Nov 2026. Lost worktime rate = hours absent as a percent of hours usually worked; absence rate = workers with absences ÷ total full-time wage and salary employment (2021 US averages: lost worktime 1.9%, absence rate 3.2%): U.S. Bureau of Labor Statistics, Current Population Survey, Table 47 “Absences from work of employed full-time wage and salary workers by occupation and industry”, 2021 annual averages. Days-based rate: same ratio in days.

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