Estimate emergency department treatment capacity from staffed spaces, operating hours, average treatment time, turnover time, and operating days. The calculator converts space-time into a theoretical visit ceiling and applies a user-set practical utilization factor for interruptions and uneven arrivals. It is useful for scenario planning, but it does not model acuity mix, boarding, diagnostics, or time-varying demand.
The main result is monthly practical visit capacity under a steady-flow assumption. The theoretical figure shows the space-time ceiling before the practical factor reserves capacity for real-world interruptions and uneven demand.
Emergency arrivals and service times are variable. Boarding, acuity, diagnostics, staffing by role, surge requirements, and clinical safety constraints require separate analysis.
For 18 staffed spaces open 24 hours, with 180 treatment minutes, 15 turnover minutes, 30 days, and an 80% practical factor:
No. Add blocking time to the treatment-time input or model boarding separately if it occupies treatment spaces.
It reserves part of the theoretical ceiling for uneven arrivals, interruptions, cleaning variability, and other flow losses.
Only if their average cycle times and operating hours are similar; otherwise calculate each zone separately.
No. The practical factor is limited to 100%, so practical capacity cannot exceed the space-time ceiling.
No. Safe volume also depends on acuity, staffing, diagnostics, boarding, and local clinical standards.
| Variable | Definition | Unit |
|---|---|---|
| Cycle time | Treatment plus turnover | Minutes |
| Theoretical capacity | Space-time ceiling | Visits |
| Practical factor | User-set usable share of ceiling | Percent |