Estimate the paid field staff needed to keep an ambulance fleet covered across shifts. The calculation converts staffed unit-hours into annual labor hours, then accounts for relief coverage and each employee’s productive availability.
Productive hours should already exclude leave, training, and other time that cannot cover a field assignment.
The rounded result is a planning headcount for continuous unit coverage, not the number of people working at one moment.
Scheduling rules, skill mix, local labor agreements, supervisor coverage, and surge units can change the actual hiring requirement.
Eight ambulances with two-person crews operating 24 hours for 365 days require 140,160 staffed hours. At 1,680 productive hours per FTE, base need is 83.43 FTEs; a 10% relief allowance raises the plan to 91.77, rounded up to 92 FTEs.
No. Use the annual hours an employee is realistically available for ambulance coverage after leave, training, and other non-field time.
A fraction of an FTE cannot independently fill an entire required shift, so the planning result is rounded up.
Run separate scenarios for each crew model, then add the results so different staffing ratios are preserved.
It can, provided the percentage reflects vacancies, unscheduled absence, and any planned overlap without double counting.
No. It estimates staff assigned to ambulances; add dispatch, management, logistics, and clinical support separately.
| Variable | Meaning |
|---|---|
| Unit-hours | Ambulances × coverage hours × operating days |
| Staffed hours | Unit-hours × crew members per unit |
| Productive FTE hours | Annual hours actually available for field coverage |