The number comes from payroll, not from the facility
Nursing homes submit staffing data to CMS through a payroll-based system, which ties reported hours to actual payroll and census records rather than to a facility's own description of its staffing. That distinction is the single most useful thing to know about this measure: it is auditable in a way self-reported staffing was not.
It also means the figure reflects hours actually paid across the reporting period, including the ordinary variation of a real schedule — not a staffing plan or an intention.
It is adjusted for how much care residents need
CMS does not compare raw hours between facilities. It adjusts for case mix — the acuity of the residents each facility actually serves — so a facility caring for people with heavier clinical needs is expected to staff at a higher level to earn the same rating.
This is why two facilities reporting similar raw hours per resident per day can receive different staffing stars. The one serving sicker residents is being measured against a higher expectation. Reading the raw hours without the adjustment is the most common way this measure gets misread.
Registered nurses are counted separately
CMS reports registered-nurse staffing separately from total nurse staffing, because RN time is the scarcer and more clinically consequential input. A facility can look adequate on total nursing hours while carrying comparatively little RN time, and the separate reporting exists so that pattern is visible rather than averaged away.
If clinical complexity is central to your situation — recent hospitalization, wound care, IV therapy, unstable conditions — RN availability is usually the staffing dimension worth asking about directly.
What this site shows, and what it does not
Every facility page here carries the CMS staffing star alongside the overall, health-inspection, and quality-measure ratings, so you can see where staffing sits relative to the rest of a facility's record. Provider search can filter to facilities CMS rates lower on staffing, which is useful for understanding a local landscape rather than for screening a single facility.
Per-shift and per-day staffing hour detail is not part of the dataset this site is built from. For those underlying numbers — and for turnover and weekend staffing, which CMS also publishes — go to Medicare's Care Compare for the facility directly. We would rather point you to the authoritative source than approximate it.
Questions worth asking a facility
The CMS record tells you what was true across a past reporting period. These questions get at what is true now, and staff generally answer them readily.
How many residents does one aide care for on a typical day shift, and on nights and weekends?
Is there a registered nurse in the building around the clock, or on call for part of it?
How much of the schedule is currently covered by agency or temporary staff?
What has turnover looked like on this unit over the past year?
What the staffing measure cannot tell you
Hours are a count, not a description of care. They say nothing about the experience of the people working those hours, how well a unit is led, or whether staffing held up during the week you happened to need it.
Staffing also varies within a building. A well-staffed facility overall can have a stretched unit, which is why the CMS number is a reason to visit and ask rather than a substitute for doing so.