Ontario's staff-to-child ratios, in plain language

The Child Care and Early Years Act sets exactly how many staff each room needs. Here are the numbers — no legalese, no decimals — plus the fine print directors actually get asked about.

The ratios

Read them as sentences: 3 staff for every 10 infants. 1 staff for every 5 toddlers. 1 staff for every 8 preschoolers. That's how MimiGrow displays them — because a supply educator walking into a room at 8am shouldn't need a calculator.

The fine print that matters

• Reduced ratios are never permitted for infants. During arrival, departure, and rest periods, other age groups may operate with reduced staffing — but the infant room stays at full ratio all day.
• Qualified-staff proportions apply too. It's not just bodies in the room: the regulation sets what share of staff must hold recognized qualifications (for example, 2 in 3 for preschool rooms). Plan schedules around it, not just headcounts.
• Maximum group size is separate from ratio. A room can be within ratio and still over its group maximum. Both numbers have to hold at once.
• More staff is always allowed. These are minimums. Centres routinely staff above ratio — the law only sets the floor.

How directors actually use this

The daily reality: children arrive and leave at different times, staff call in sick, and the legal minimum shifts through the day. The centres that stay calm do three things — track attendance live instead of on paper, know each room's ratio at a glance, and manage the pickup wind-down deliberately instead of by feel. That's exactly what our attendance and ratio software does, including the Auto Crunch queue for early signouts.

Figures reference O. Reg. 137/15 (General) under Ontario's Child Care and Early Years Act, current to October 2026. Regulations change — confirm against the Ontario licensing manual for your centre. This guide is not legal advice.