TOG Rating Selector Tool
Find the right sleep sack warmth level based on your baby’s age and room temperature, the two things that actually determine what TOG rating suits your baby.
How it works
- Select your baby’s age and room temperature, the two inputs that determine the TOG number.
- Optionally note the season for a couple of extra practical tips, though it will not change the TOG number itself, since the actual room temperature already accounts for that.
- Get a TOG rating with fabric suggestions to guide your shopping.
Fabric suggestions
About this tool
This tool uses room temperature as the primary factor, since it is a direct measurement of the sleep environment, with a small adjustment for younger babies, who regulate their own temperature less effectively than older infants. We checked these numbers against a leading sleep sack brand’s own published TOG chart and kept the two consistent.
Season is included as an optional input for practical context only, such as reminders about drier winter air or rooms that heat up during the day, since your baby’s actual room temperature already reflects whatever the season is doing outside.
Frequently asked questions
Why doesn’t season change the TOG number here?
Room temperature is a direct measurement of what your baby is actually sleeping in, while season is only a rough proxy for that. A climate-controlled room can stay the same temperature year-round, so adjusting the number by season on top of an already-specific temperature reading would make the recommendation less accurate, not more.
Why do newborns get a slightly warmer recommendation?
Newborns have less body fat and less developed temperature regulation than older babies, so a small safety margin toward warmth is a commonly recommended practice in cooler and moderate rooms. In already-warm rooms, no extra layer is added, since overheating is the greater risk there.
What if my sleep sack’s own label gives a different TOG for my room temperature?
Follow the manufacturer’s own guidance for that specific product first. TOG charts vary slightly between brands and fabrics, so this tool is a general guide, not a substitute for the label on what you actually buy.