A float pool, or internal resource pool, is a group of nurses employed by a facility or system with a regular schedule but no home unit. They are assigned wherever the need is that day. It is the arrangement most often confused with per diem work, and the difference is worth stating precisely: in a float pool the flexibility belongs to the employer, not to the nurse.
How it differs from the neighbouring arrangements
A float pool nurse is an employee with scheduled hours, usually benefits, and an assignment that changes shift to shift. Income is predictable; the workplace is not.
A per diem nurse commits to no fixed hours, is paid a premium rate, and can decline. Income is unpredictable; the calendar is the nurse's own.
A travel nurse takes a fixed-term contract away from home, normally thirteen weeks, with housing or a stipend attached and an agency as the employer.
Part-time staff employment is different again: fewer hours, but scheduled, on one unit, often with prorated benefits.
Facilities frequently run all four at once, and the mix is a budget decision as much as a clinical one.
Why employers build them
Two reasons, and the second is the one that gets overlooked.
The first is money. A float pool covers the same gaps as agency staffing without the agency margin. On the 2026 staffing survey figures a travel nurse costs a hospital $91.23 an hour, or $189,758 a year, against $59.46 an hour or $123,676 for an employed registered nurse including benefits. That is $66,081 a year per nurse, and an internal pool captures most of it. Seven in ten hospitals say they want to reduce agency use; a pool is one of the few levers that actually does it. See using travel nurses.
The second is that pool nurses are the facility's own. They have been through its orientation, know its record system and policies, and appear in its competency records. A hospital that covers gaps internally is buying coverage and continuity in the same transaction, which agency coverage does not offer at any price.
Pool nurses are usually paid a differential above the unit staff rate to compensate for the constant reassignment, which is smaller than the per diem premium because the benefits are intact.
What makes a pool work or fail
Competence across the units in scope. A pool nurse is expected to function on several kinds of unit, which requires real cross-training and a documented competency for each, not an assumption that a medical-surgical nurse can cover step-down.
A defined scope. Pools that cover a coherent group of units produce nurses who are genuinely capable in all of them. Pools defined as "anywhere in the hospital" produce nurses who are new somewhere every shift.
Orientation that is more than a badge. The point of an internal pool is that its nurses are not strangers.
Assignment discipline. A float nurse dropped into an unfamiliar specialty with the heaviest patients is a staffing decision with clinical consequences, and skill mix and continuity are exactly what the staffing research measures. See nurse staffing and patient outcomes.
Respect on the receiving unit. Pool nurses know quickly which units treat them as help and which treat them as spare capacity, and staffing offices know which units pool nurses will not go back to.
From the nurse's side
Float work suits nurses who like variety, want broad exposure early in a career, and would rather keep employment benefits than trade them for a higher hourly rate. It builds a genuinely wide competence and a picture of how a whole institution runs, which is useful preparation for both travel work and management.
Its costs are real too. There is no team you belong to, no unit culture to settle into, and no seniority on any particular rota. The assignment is often whatever is left after the unit staff have chosen, and the nurse is permanently the person who has to ask where things are kept.
For workforce planning
The practical question for an employer is not whether to have a pool but how much of the variable demand to cover internally. Census and acuity fluctuate every day; the choice is between absorbing that variation with overtime, an internal pool, a per diem roster, agency shifts or travel contracts, each with a different price and a different lead time. See patient acuity and staffing systems and nurse overtime.
The size of the pool should be set against the size of the hole. The typical hospital carries 43 unfilled registered nurse posts and takes 78 days to fill one, and the specialties with the highest turnover, behavioural health, emergency and telemetry, are the ones a pool has to be competent in if it is going to reduce agency spend rather than simply exist.
Related
- Per diem nursing
- Building a per diem roster
- Travel nursing
- Nurse staffing and patient outcomes
- Patient acuity and staffing systems
Sources
- National Health Care Retention and RN Staffing Report. NSI Nursing Solutions, 2026 edition, for the cost comparison, vacancy, time to fill and turnover by specialty. Accessed September 9, 2026.
- 78 days to hire one nurse: the 2026 staffing numbers every nurse employer should know. NurseRecruiter, 3 September 2026. Accessed September 9, 2026.
- How to find per diem nurses to hire. NurseRecruiter, 26 January 2025, on in-house pools and the orientation advantage they carry. Accessed September 9, 2026.
- What is Per Diem Nursing? NurseRecruiter, 13 February 2024, on how flexible arrangements differ. Accessed September 9, 2026.