Staff-to-child ratio calculator
Ratio is the one number that decides whether a room can open. Put your licensor's ratio in each row, enter who is enrolled, and the calculator tells you how many adults have to be standing in that room.
Set each room's ratio to what your licensor requires, then enter how many children are enrolled in it.
| Age band | Children | 1 staff per | Staff needed |
|---|---|---|---|
| Infants0-12 months | 2 | ||
| Toddlers13-24 months | 0 | ||
| Two-year-olds25-35 months | 0 | ||
| Preschool3-4 years | 0 | ||
| School-age5 years and up | 0 |
Whole program
2:6
2 staff on the floor for 6 children
- Infants: 6 children, 2 staff at 1:4, 1 group(s)
- Toddlers: 0 children, 0 staff at 1:5, 0 group(s)
- Two-year-olds: 0 children, 0 staff at 1:7, 0 group(s)
- Preschool: 0 children, 0 staff at 1:10, 0 group(s)
- School-age: 0 children, 0 staff at 1:15, 0 group(s)
How the math works
Staff needed is enrolment divided by the ratio, always rounded up: nine toddlers at 1:5 is two staff, not 1.8. Rounding up per room is why a program can be in ratio overall and out of ratio in one room — the calculator counts each band separately for exactly that reason.
Group size is the second limit. A state that licenses 1:4 for infants and caps the group at 8 does not let you run twelve infants with three teachers in one room; you need two rooms. The tool shows the group count beside the staff count so the two limits never get confused.
Why there is no single answer
There is no federal staff-to-child ratio. Licensing is written state by state, which is why an infant room can be 1:3 in one state and 1:4 across the border. The federal government maintains a searchable database of every state's regulations, and Childcare.gov explains what licensing does and does not guarantee.
Licensing requirement
Ratio is checked at the moment an inspector walks in, not on average across the day. Opening, nap and closing are when programs fall out of ratio — build the schedule to cover those hours first.
Mixed-age rooms
Most states apply the ratio of the youngest child in the room. One eleven-month-old in a toddler room usually drags the whole room to the infant ratio. Model it here by putting that child in the infant row: the staff figure it returns is the honest one.
Sources
- Child Care Licensing — Childcare.govfetched 2026-09-04
- National Database of Child Care Licensing Regulations (HHS/ACF)fetched 2026-09-04