Care home staffing levels calculator: turn dependency into staff on every period

"How do you know you have enough staff on tonight?" is the question behind every staffing conversation with an inspector. The honest answer is never a ratio. It is a method: you scored residents' needs, turned them into hours of care, and rota'd enough of the right people to deliver them. This calculator does the arithmetic. Everything stays in your browser: nothing is sent or saved.

Is there a legal staffing ratio for care homes?

No. None of the four UK nations sets a staff-to-resident ratio in law. Each one requires enough suitably qualified people for the residents you have, and expects you to be able to show how you decided.

Two things follow. First, a number copied from another home, or from last year, proves nothing. Second, the record of how you worked out your numbers is evidence in its own right: Wales and Northern Ireland say so in terms, and in Scotland the Care Inspectorate has published a Staffing Method Framework for adult care homes that inspectors may refer to.

How dependency tools work

A dependency tool scores each resident against the things that take staff time: mobility and transfers (one or two to assist, hoist), personal care, continence, eating and drinking, communication, cognition and distressed behaviour, night-time needs and, in a nursing home, nursing tasks. The scores put each person in a band, and each band carries an estimate of care hours.

Add the hours across residents and you get the care your home needs to deliver in each period. Divide by the hours one member of staff can actually spend on care in that period, and you get staff on duty.

Commercial tools do this with their own scoring and their own hours per band. You can also build a simple version yourself, which is what the calculator below does. Either way, the tool supports your judgement. It doesn't replace it: two residents in the same band can need very different things at 07:30.

The calculator: residents by dependency to staff on duty

Enter how many residents you have in each band, then the care hours each resident in that band needs in each period. The hours already filled in are made-up example figures so you can see how it works. They are not a standard, a guideline or a recommendation. Replace them with the hours from your own dependency tool or your own timings.

How the calculation works

For each period:

Care hours needed = sum of (residents in each band × care hours per resident in that band)

Staff on duty = care hours needed ÷ (period length × time on direct care), rounded up, and never below your minimum

• Periods. The defaults are Day 08:00 to 17:00 (9 hours), Twilight 17:00 to 22:00 (5 hours) and Night 22:00 to 08:00 (10 hours), so the three add up to 24 hours. The calculator gives the number of staff who need to be on duty all the way through each period. Your shifts don't have to match the periods: a long day of 08:00 to 20:00 covers the whole day period and part of the twilight.
• Time on direct care. Nobody spends every minute of a shift on hands-on care. Breaks, handover, writing up, phone calls and fetching equipment all take time. The 80% default is an example only; if you have timed it, use your own figure.
• Minimum on duty. Some floors don't come from care hours at all. The most common is nights: your fire risk assessment and evacuation plan may need a set number of waking staff however settled the residents are. Northern Ireland's nursing home standards say staffing should take fire safety requirements into account, and that is good practice everywhere.

A worked example (example figures only)

A 30-resident home has 8 residents in the low band, 12 medium, 7 high and 3 very high. Using the example hours:

The manager then asks the questions the arithmetic can't. Is one of the seven on days a senior carer leading the shift? Who gives the medicines? Do the three very high residents all need two to assist at the same time each morning? If two night staff are both helping one person, who is watching the other 29? In this home the manager might decide on 3 waking staff at night because two people need repositioning together and the building has two floors. That decision, and the reason for it, belongs in the written record.

Turning the numbers into a day, twilight and night rota

The calculator gives staff on duty per period. The rota is how you deliver it.

1. Write the numbers into a staffing levels planner for each period, unit by unit if floors are staffed separately, with the lead role each period needs (a senior carer, or a nurse in a nursing home). Our care staff rota template has a planner and a weekly rota you can copy.
2. Pick shifts that cover the periods. Long days (08:00 to 20:00) and nights (20:00 to 08:00) with a twilight shift (for example 17:00 to 22:00) is one common way to cover a busy evening. Earlies, lates and nights is another.
3. Check the skill mix, not just the headcount. Medication-trained, moving and handling-trained and first aid-trained staff on every period that needs them, and nobody on shift whose mandatory training has lapsed.
4. Plan breaks into the numbers. Staff working more than 6 hours are entitled to a 20-minute rest break. If seven people are on days, someone covers each break.
5. Count every period before you publish. Any period below your number is a gap to fill or to explain.

For nursing homes, add a nurse count to every period. Our guide to nursing home staffing and rotas covers nurse cover in more detail.

The evidence inspectors ask to see

Whichever regulator you answer to, the same records show that staffing follows residents' needs:

• Your dependency assessments, dated, for each resident, reviewed when needs change.
• Your staffing calculation: the hours per band you used, the period lengths, the minimums and the reasons for them. Keep each version.
• Published rotas showing names, roles and the lead on every period, and how they compare with the calculation.
• Gaps and what you did about them: agency or bank cover, a manager on the floor, a reason recorded.
• Feedback from staff, residents and relatives about whether there are enough people at busy times.

In England this answers CQC's question under Regulation 18 about a systematic approach. In Wales it is the demonstration regulation 34(3) asks for. In Scotland it shows how you meet the duty in section 7 of the Staffing Act; see our guide to the Health and Care (Staffing) (Scotland) Act. In Northern Ireland, Standard 41 expects nursing homes to keep a record of the calculation, and duty rotas that name the nurse in charge on each shift and record actual hours worked. For Wales, see also our care home rota guide for Wales.

When to recalculate

• A new admission or a discharge.
• A resident whose needs change: after a fall, a hospital stay, a decline in mobility or the start of end of life care.
• An infection outbreak, when staff may need to stay on one floor.
• Changes to the building: a unit opening or closing, a floor out of use.
• Repeated incidents at the same time of day, such as falls at 06:00 or distress in the early evening. That is often a staffing pattern, not bad luck.
• And at least monthly as a routine, even if nothing obvious has changed.

Mistakes to avoid

• Treating the calculator's answer as the safe level. It is a floor built from your figures. Judgement, skill mix and the building come on top.
• Staffing to beds, not people. Registered bed numbers tell you nothing about who is in them today.
• One number for the whole day. Mornings and early evenings are usually the busiest; the period split is there for a reason.
• Forgetting nights. Night hours per resident are lower, but the minimum to evacuate safely and to help someone who needs two staff doesn't shrink.
• No paper trail. A calculation that lives in the manager's head can't be shown to anyone.

How ShiftComplete helps you show safe staffing

ShiftComplete doesn't calculate dependency: the numbers come from your own assessment, from this calculator or from the tool you already use. What it does is hold those numbers against the rota every week.

• Safe staffing periods per site, for example Day and Night, or Early, Late, Twilight and Night, each with a minimum headcount and minimums for nurses, senior carers and carers. A senior carer also counts towards the carer minimum once the senior carer minimum is met.
• A strip on the rota shows each period each day as met or short, and names the gap and when ("Night Tue: 1 nurse short").
• Every gap in the week is listed before you publish. By default you can publish anyway; the owner can switch on a block so each gap has to be filled or acknowledged with a reason, which builds the record of what you did about it.
• Rota warnings when someone's mandatory training, DBS next check, right to work or visa has lapsed, so headcount doesn't hide a skills gap.
• Open shifts to bank staff: post a gap, staff whose role fits ask for it on their phone, and a manager or deputy approves.

It works alongside your care-records system and doesn't do care plans, eMAR or daily notes. It costs £2.49 per active staff member per month, with no minimum and no contract, and the first 60 days are free with no card needed.

See how it works for residential homes on our care homes page, or for nurse cover on every period on our nursing homes page.