How to Plan Staff-to-Child Ratios and Rosters in a Nursery

How do you plan a nursery roster to ratio, step by step?

These steps work for a nursery, preschool, kindergarten or daycare centre of any size. They take about an hour for a three-room setting once your rooms are set up.

• 1. Copy the ratio, minimum staff in a room and qualification rules for each age band from your regulator's current framework, and write down the date you checked.
• 2. List who may count in ratio: usually staff of a minimum age, with completed background checks, working directly with children.
• 3. From your bookings, count the children expected in each room for every half hour of the day, allowing for later arrivals and earlier departures from your own registers.
• 4. Work out staff required for each half hour: children divided by the ratio, rounded up, never below the room minimum.
• 5. Place shifts so the number of adults follows the arrival and departure curve, with the most adults when rooms are fullest.
• 6. Place breaks one at a time, only in half hours where the room has an adult to spare.
• 7. Add a floater (a deputy or bank practitioner) for break cover and the late afternoon.
• 8. Check every half hour of the plan again after any swap, and fix any gap before the week starts.
• 9. During the day, count children and adults in each room every hour and write both down.
• 10. When a count fails, restore ratio at once, record the time and action, and tell the manager.

What does a staff-to-child ratio mean, and who sets it?

A ratio is the number of children one adult may care for in an age band. It is a legal minimum set by your regulator, not a staffing target, and it applies every minute children are present, including mealtimes, sleep and the end of the day. Regulators usually also set a minimum number of adults, a qualification mix (for example, how many adults must hold a particular qualification) and rules on who may be counted.

Ratios differ by country and often by state. The table shows a few published examples to illustrate the differences; it is not a summary of the law. Always read the current official text for your setting type.

How do you calculate the staff a room needs?

Use one formula: staff required = children present divided by children per adult, rounded up to a whole person, and never below the room minimum. Rounding up is what catches people out. At one adult to eight children, 17 children need three adults, and so do 24. At one to five, 18 two-year-olds need four adults, because 3.6 adults is not a thing.

Then check the qualification mix and who counts. A student, a volunteer whose checks are not back, or the cook helping at lunch usually cannot be counted, even if they are in the room. A manager in the office is not in the room at all.

Children are not all present all day, so plan from expected children, not bookings alone. Look at four weeks of registers and note what share of each room's booked children are actually in by 07:30, 08:00 and 08:30, and still there at 16:30, 17:00 and 17:30. Your registers will show how quickly each room fills and empties. Use your own figures, round the expected number of children up, and review them each term, because arrival patterns change when families' working patterns change.

What does a worked roster example look like?

Here is a worked example from a composite toddler room: 18 two-year-olds booked on a Wednesday, a ratio of one adult to five and a minimum of one adult in the room. Five practitioners work eight and a half hours with a thirty-minute unpaid lunch break, on staggered starts from 07:30 to 09:30. Staff required in the middle of the day is 18 / 5 = 3.6, rounded up to 4.

The plan works until one practitioner moves her break from 13:00 to 12:30, where it lands on top of a colleague's. At 12:30 two people are on break, three adults are left, and the room is one short. Moving her break back to 13:00, when nobody else is on break, closes the gap. In the planning sheet this shows up as a red row before the week starts, rather than as a breach in the room on Wednesday.

How do you schedule breaks without breaking ratio?

Breaks are where rosters fail, because the roster shows who is on shift but rarely who is on break at the same moment. Write break times on the roster, not just shift times. Place them in half hours where the room has an adult to spare; in the example above, only 13:00 and 14:00 have spare cover. Where a room is exactly at ratio all day, a floater has to cover breaks.

Agree one simple rule with the team: breaks are swapped only after someone has checked the new time against the plan. Lunch is also when the end of the morning session, meals, nappy changes and the start of sleep all happen together, so it is the half hour to check first.

How often should you check ratios during the day?

Many settings count every hour and at every change: when someone leaves the room, when a child arrives or leaves, and when rooms combine at the end of the day if your regulator allows it. The room leader counts children and the adults who count in ratio, writes both on a board on the wall, and the numbers are typed into a log so the manager can see patterns over a month.

When a count fails, the order is always the same: restore ratio at once (call the deputy or manager), write the time and action, tell the manager, and talk about the cause at the next huddle without blame. Check your regulator's rules on whether a breach must be reported. The most common cause is an ordinary event: a poorly child taken to the office by a room adult, a phone call, a parent who wants a word at the door.

Why do ratios matter so much for nursery costs?

Staff is the largest cost in almost every setting. The UK Department for Education's Childcare and early years provider survey for 2025 found staffing accounts for most providers' costs, from 70% for childminders up to 88% for school-based providers. Because ratios round up, each extra child either costs a whole extra adult or almost nothing. Seventeen children at one to eight need a third adult; the next seven do not need a fourth.

That is why occupancy in the older rooms often decides a setting's margin, and why baby rooms, at one adult to three or four, tend to run on a thin contribution. Plan places, fees and staffing together, room by room, before you change prices or cut places.

A simple check: for each room, multiply the staff the ratio needs at its fullest by the hours you staff at full ratio each day, add an allowance for breaks, leave, sickness and training, and cost it at your average hourly rate including on-costs. Compare that with the room's fee and funding income at your planning occupancy. A room whose income does not cover its own staff and food is not necessarily a mistake, but you should know it, and know which room is carrying it.

What are the common mistakes in nursery rostering?

Ratios are only one part of keeping children safe. Background checks, a named safeguarding lead, collection controls and a code of conduct sit alongside them, and the rules for each differ by country. Settings that want to test managers' judgement in these moments sometimes use situational assessments such as AssessAll's Early Years and Childcare Practice Judgment alongside supervision.

• Typing ratios from memory or last year's document instead of the regulator's current text.
• Rostering staff around preferences, then hoping the children fit.
• Leaving break times off the roster, or letting staff swap them without a check.
• Counting people who cannot count in ratio: students, volunteers with checks pending, office staff.
• Running rooms exactly at ratio all day, with no slack for a poorly child or a toilet trip.
• Combining rooms at the end of the day without checking that your regulator allows it and that ages and qualifications fit.
• Not writing down hourly counts, so a pattern of near misses stays invisible.
• Letting an AI tool state ratios or decide who counts. Use it to draft rota messages or suggest break patterns, then check every suggestion against your own plan and rules.