California Daycare Ratios: Staff-to-Child Ratios and Group Sizes by Age

California center ratios sit in Title 22, Division 12, administered by the California Department of Social Services (CDSS) Child Care Licensing Program.

Infant care centers must keep one teacher for every four infants; a fully qualified teacher may supervise up to 12 infants with aides each responsible for no more than 4.

On activities away from the center, an infant center needs at least one adult for every two infants.

Preschool-age rooms run one teacher per 12 children, or one teacher plus one aide for 15 children, or one fully qualified teacher plus one qualified aide for 18.

The 18-child configuration is a preschool option only and does not apply in infant centers or school-age centers.

State-funded child development programs operating under Title 5 follow Title 5 staffing ratios instead of the Title 22 numbers.

Title 22 writes its staffing rules as per-teacher supervision limits, and our research found no explicit maximum group size for preschool-age rooms.

The effective ceiling comes from the ratio itself: the rule requires one teacher visually observing and supervising no more than 12 children, and rooms grow by adding staff — one teacher plus one aide for 15 children, or a fully qualified teacher plus a qualified aide for 18 — rather than by stretching one teacher further.

In infant care, the largest supervision structure the rule describes is one fully qualified teacher supervising up to 12 infants, with aides each responsible for no more than 4.

For the optional toddler component and for school-age centers, our research did not confirm a group size.

A licensee serving preschool-age children may create an optional toddler component for children between 18 months and 36 months of age, in areas physically separate from older or younger children.

Our research did not confirm the toddler component's own ratio or group size, so confirm that figure with CDSS Child Care Licensing before you staff a toddler room.

Nap time relaxes the ratio: one teacher, or a qualified aide at least 18 years old, may supervise up to 24 napping preschool children, provided the remaining teachers needed to meet the regular ratio are immediately available at the center.

For sleeping infants, the nap ratio is 1:12.

The center director may be counted in the teacher-child ratio only when actually teaching a group of children, and clerical, housekeeping and maintenance staff may not be counted.

Aides carry qualification terms of their own: in the 18-child preschool configuration, the aide working with a fully qualified teacher must have 6 semester units of early childhood education or child development, or be completing at least 2 units each semester until 6 are done.

Center staff who supervise employees or provide care and supervision to children must be at least 18 years old; aides under 18 are allowed only if they are high school graduates or enrolled in an occupational program.

Licensed family child care homes in California are capped by total capacity rather than a room-by-room ratio.

A small family daycare home serves 8 or fewer children and a large family daycare home serves 7 to 14, and the provider's own children under 10 count toward the total in both cases.

A small home may go from 6 up to 8 children with no additional adult only if every condition in the rule is met: at least one child attends kindergarten or elementary school, a second child is at least 6, no more than two infants are present, parents are notified, and a landlord consents for rented property.

A large home may serve 13 or 14 children only if at least one child is in kindergarten or elementary school, a second is at least 6, and no more than three infants are present when more than 12 children are in care.

Take a center with one infant room of eight infants and two preschool rooms of 12.

With one teacher allowed for every four infants, the infant room needs two teachers on the floor.

Each preschool room of 12 needs one teacher; a room of 15 would need a teacher plus an aide, and a room of 18 would need a fully qualified teacher plus a qualified aide with 6 semester units of early childhood education or child development, or one completing at least 2 units each semester until 6 are done.

When both preschool rooms nap at once, the rule allows one teacher to supervise up to 24 napping children while the remaining teachers needed for the overall ratio are immediately available at the center.

This is an illustration of the arithmetic the ratios force, not a compliance check — confirm any staffing plan with CDSS Child Care Licensing.