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Absence Rates Capacity (Annual) Calculator

Estimate your annual available work capacity after allowing for employee absence rates, contracted hours and working weeks.

Your Details

Overview

Use this annual absence capacity calculator to estimate the staff hours available for work after allowing for an expected absence rate. Enter your headcount, average contracted weekly hours, scheduled working weeks, and annual absence percentage to see the remaining capacity.

How it works

The calculator first multiplies headcount by weekly hours and working weeks to find total scheduled annual hours. It then applies the absence percentage to estimate lost hours. Subtracting those lost hours gives available annual capacity. The remaining hours are also converted into full-time-equivalent capacity using the working pattern you entered.

How to use this calculator

  1. 1Enter the number of employees in the team or workforce.
  2. 2Add the average contracted hours worked per employee each week.
  3. 3Enter the number of scheduled working weeks in the year.
  4. 4Enter the expected annual absence rate as a percentage.
  5. 5Review the available hours and equivalent FTE capacity.

Example Calculation

Number of employees

20

Contracted hours per employee per week

37.5

Working weeks per year

46

Annual absence rate

4%

Available annual capacity

33,120 hours

The team has 34,500 scheduled annual hours. At a 4% absence rate, about 1,380 hours are lost, leaving 33,120 available hours, or 19.20 FTE of capacity.

Frequently asked questions

What is an annual absence rate?

An annual absence rate is the percentage of scheduled working time expected to be lost through sickness or other unplanned employee absence during a year.

Should annual leave be included in the absence rate?

Usually no. Enter working weeks after planned annual leave and public holidays have been removed, then use the absence rate for unplanned absence.

How is available annual capacity calculated?

Available capacity equals headcount multiplied by weekly hours and working weeks, minus the percentage of those scheduled hours expected to be lost to absence.

What does available FTE mean?

Available FTE expresses the remaining annual hours as the equivalent number of full-time employees working the weekly hours and weeks you entered.

Can I use this calculator for part-time teams?

Yes. Use average weekly hours that reasonably reflect the team, or run separate calculations for employee groups with different working patterns and add the results.

Does this calculation show whether the team has enough cover each day?

No. It estimates total annual capacity only. Daily coverage can still be affected by when absences occur, shift patterns, skills, and peak workloads.

Explore Related Calculators

Absence Rates Workload CalculatorEstimate the workdays and staffing capacity lost to employee absence, plus the cover needed to maintain planned workload.Calculate →Absence Rates Workload (Individual) CalculatorEstimate how planned absences reduce an individual’s annual working capacity and affect the workload that can realistically be completed.Calculate →Absence Rates Workload (Team) CalculatorEstimate your team’s available working capacity after absences and identify any workload shortfall or additional staffing need.Calculate →Absence Rates Workload (Annual) CalculatorEstimate the annual workdays, hours and full-time workload lost to employee absence across your organisation.Calculate →

Assumptions and warnings

Assumptions

  • The absence rate is applied evenly to all scheduled employee hours.
  • Working weeks already exclude known annual leave, public holidays, and planned business closures.
  • Employees are assumed to have the same average weekly hours and working pattern.
  • Results are planning estimates and do not account for the timing of individual absences or skills coverage.