The establishment a workload needs, including the leave

Multiply average daily census by nursing hours per patient day by the days a year the unit is open, then divide by the paid hours in one FTE year. That gives worked FTE, which is the first half of the answer.

A worked example, because the formula is easier to trust once it has numbers in it. A 24-bed ward running at an average census of 24, funded to six nursing hours per patient day, open every day of the year, needs 24 × 6 × 365 = 52,560 nursing hours a year. Divide by 2,080 — forty hours a week for fifty-two weeks — and the answer is 25.27 worked FTE.

That figure is correct and it is not the establishment. It is the number of full-time equivalents STANDING ON THE UNIT, and a person standing on the unit for 2,080 hours a year is a person who never took a holiday, never called in sick, and never sat through a single mandatory training day. Fund 25.27 posts and the ward is fully staffed only on the days when nobody is away, which is not many of them.

The days-open figure is the one most often left at 365 by mistake. An inpatient ward really does run 365 days; a weekday infusion suite runs about 260, and using 365 for it overstates the establishment by forty per cent. The box is editable for that reason.

The relief factor is paid hours divided by hours actually worked. It is the multiplier that turns worked FTE into the establishment a unit must be funded for, and it is derived from figures a finance department already holds.

Take one FTE at 2,080 paid hours. Subtract the annual leave entitlement, say 160 hours; the sick absence the unit genuinely runs at, say 40; and mandatory education and orientation, say another 40. That leaves 1,840 hours on the unit, and 2,080 ÷ 1,840 is 1.13. Every worked FTE therefore costs 1.13 paid FTE, and the ward above needs 25.27 × 1.13 = 28.57 posts rather than 25.27.

Three whole nurses is not a rounding difference, and the way it usually shows up is not as a staffing paper but as an agency invoice. A unit funded at its worked figure is structurally short by its own leave entitlement, so it books agency to cover the leave, and then the conversation becomes about agency spend rather than about an establishment that was never big enough. The relief factor is where that argument is actually settled.

The number to use is your own. A department with generous leave and a real education programme runs above 1.15; one with minimal entitlement and low absence runs nearer 1.08. Borrowing a benchmark defeats the purpose, because the whole value of the calculation is that it is built from figures specific to this unit rather than from somebody's published average.

There is no universal figure, and any calculator that hands you one is guessing about a unit it has never seen. NHPPD is set by the type of unit, the acuity of its patients and the standard the organisation has adopted.

What can be said generally is the shape: an intensive care unit runs several times the hours per patient day of a general medical ward, a step-down unit sits between them, and a skilled-nursing facility is measured on a different basis again. What the right number is for your unit is a clinical and financial decision made locally, and this tool applies whatever figure you give it rather than asserting one.

For skilled-nursing facilities specifically, the hours are not just a local decision — they are reported. Facilities submit staffing data to CMS through the Payroll-Based Journal, built from payroll rather than from a roster, and the hours per resident day that emerges is what a rating is calculated from. That makes the direction of the calculation matter: an establishment derived from a standard the facility cannot actually deliver produces a reported figure that does not match the paper it was budgeted on.