Absence Rates Project Time Calculator FAQ

It estimates productive weekly team capacity and the weeks needed to complete a stated amount of project work after an average absence allowance and optional contingency.

It can be used for high-level project, workforce, or resource planning where work can be expressed in productive hours.

Scheduled capacity is all planned weekly team hours. Available capacity is scheduled capacity after the expected absence percentage is deducted.

No. It applies one average rate across team capacity and does not predict when or who will be absent.

Enter the estimated productive hours needed to complete the project work. Avoid including hours that have already been excluded from the delivery estimate unless that is intentional.

The rate is multiplied by scheduled weekly team capacity to calculate expected lost hours, then those hours are deducted.

Contingency increases the duration calculated after absence. For example, a 10% contingency adds 10% of the absence-adjusted duration.

You can if it is expected to affect the project period. For date-specific planning, scheduled leave and public holidays may be more useful as separate adjustments.

Use an appropriate average only when it represents the team well. Otherwise, total individual scheduled hours first and use that total in a more detailed plan.

Its usefulness depends on the quality of the workload, hours, absence, and contingency assumptions. It is a planning estimate rather than a guaranteed completion time.

No. It assumes available capacity can be applied steadily to the work. Dependencies, approvals, and waiting time can extend the actual timeline.

Not separately. Include only productive project hours in the workload and use realistic available hours or an appropriate allowance for non-project time.

Work may be unevenly distributed, specialist skills may be unavailable, requirements may change, or absences may occur at critical stages.

It is the difference between the final estimate and the base duration with full scheduled capacity and no contingency.

For a deadline or staffing plan, rounding up can avoid presenting a fraction of a week as a complete available period. The right rounding method depends on the schedule.

Yes. Keep the work estimate and assumptions consistent, then compare the resulting weekly capacity and duration. Interpret the comparison carefully where added coordination is likely.

No. It is best used as an initial capacity estimate alongside a detailed schedule that considers tasks, owners, dates, and dependencies.