Estimate how many patient transports a staffed ambulance fleet can complete during a shift under a stated average call-cycle time. The calculation removes reserve units, adjusts scheduled unit-hours for operational availability, and converts the remaining time into theoretical transport capacity. It also reports usable unit-hours and average transports per active unit for scenario planning.
Usable unit-hours = (staffed units − reserve units) × shift hours × availability
Transport capacity = floor(usable unit-hours × 60 ÷ average call-cycle minutes)
The result is a time-based theoretical capacity, not a guarantee that calls will be completed without delay. Demand timing, geography, acuity, hospital turnaround, and unit matching can lower practical throughput.
Emergency coverage and deployment decisions require qualified local oversight; never size a fleet solely from this estimate.
Eighteen staffed ambulances with 2 held in reserve leave 16 active units. Over a 12-hour shift at 85% availability, they provide 163.2 usable unit-hours. At 75 minutes per call cycle, theoretical capacity is 130 whole transports.
Include dispatch, travel, on-scene work, transport when applicable, handoff, and return-to-ready time.
Reserve units may protect coverage for surges, failures, or special response needs and are excluded from routine capacity.
Not necessarily. Use the share of scheduled active-unit time actually usable for calls, consistent with your data.
No. This calculator measures aggregate shift throughput; use the wait-time calculator for a queueing estimate.
No. Coverage standards, geography, response targets, acuity, mutual aid, and regulation require separate analysis.
| Item | Meaning |
|---|---|
| Input | Meaning |
| Active units | Staffed units minus reserve |
| Call cycle | Dispatch through ready-for-next-call time |
| Availability | Fraction of scheduled active time usable |
| Capacity | Whole call cycles fitting usable time |