Everetts Place
Who we are?!
TOG Sleep Sack Calculator
Enter your nursery temperature to find the right TOG rating for your baby's sleep sack or swaddle.
Use a thermometer in the room where your baby actually sleeps. Homes are deceptive — an upstairs nursery holds heat long after the rest of the house has cooled.
TOG Rating Guide
| TOG | Room Temp (°F) | Room Temp (°C) | Ideal For |
|---|---|---|---|
| 0.5 | 75°F+ | 24°C+ | Hot rooms / summer |
| 1.0 | 70–75°F | 21–24°C | Warm rooms |
| 2.0 | 61–70°F | 16–21°C | Average rooms |
| 3.5 | Below 61°F | Below 16°C | Cool rooms / winter |
The part the chart can’t tell you
The crib stays bare. Warmth goes on the baby, never into the sleep space — no blankets, pillows, bumpers, positioners, stuffed animals or weighted sleep products. A wearable sack is how a baby stays warm without any of that.
When in doubt, err lighter. If the chart and your judgment disagree at 3 a.m., go lighter. A slightly cool baby wakes and complains, which is the outcome you want over the alternative.
Check the back of the neck or the chest — not hands or feet, which run cool in a perfectly comfortable baby and send most new parents reaching for another layer they don’t need.
Start with the maker’s own chart. Every manufacturer publishes a pairing of room temperature, TOG and what to wear underneath, and they know their own fabric. Use theirs as the starting point, then let your baby amend it.
Always dress baby in breathable layers. TOG is a guide — use your judgment based on how your baby sleeps. Size guide · Organic pajamas
TOG ratings explained
TOG stands for Thermal Overall Grade. It measures how warm a fabric is: the higher the number, the warmer the sack. Baby sleep sacks commonly run from about 0.5 for hot rooms up to 3.5 for genuinely cold ones. Treat the number as shorthand, not gospel. Two sacks with the same TOG can feel different, and the number says nothing about what your baby wears underneath.
Swaddle or sleep sack?
These are not the same thing, and the difference matters more than the TOG number.
A swaddle wraps the arms. It suits newborns, whose startle reflex wakes them constantly. A sleep sack leaves the arms free and works like a wearable blanket.
The switch point is not an age — it is a milestone. Stop swaddling the moment your baby shows any sign of rolling, even the earliest attempt. A swaddled baby who rolls onto their front cannot push back up. Most babies reach this between two and four months, but some get there earlier, so watch your baby rather than the calendar.
A note on weighted sleep sacks
You will see weighted sacks and weighted swaddles marketed for better sleep. Parents ask us about these often, so we will be direct: the American Academy of Pediatrics advises against weighted blankets, weighted swaddles and weighted sleep sacks for infants. Their safe-sleep guidance is explicit on the point.
We would rather tell you that than sell you something on a claim we cannot stand behind. If your baby is sleeping badly, room temperature and the layer underneath are the two things worth adjusting first, and they cost nothing to try.
Five mistakes worth avoiding
- Dressing for the thermostat, not the nursery. Put a thermometer in the room.
- Judging temperature by hands and feet. Check the chest.
- Adding a loose blanket on top of a sack. The sack replaces the blanket — that is the entire point of it.
- Buying a sack that is too big so it lasts longer. A baby can slip down inside an oversized sack. Check the size guide and buy for now.
- Overdressing "just in case". Overheating carries more risk than being slightly cool, and a slightly cool baby will tell you about it.
Common questions
What does 1.0 TOG mean?
A lightweight sack suited to rooms between 70 and 75°F (21–24°C), worn over a short-sleeve bodysuit.
What does 2.5 TOG mean?
A mid-weight sack for rooms between 61 and 70°F (16–21°C) — the most useful single weight for year-round use in most homes.
What room temperature is right for a baby?
Pediatric guidance generally puts the range at 68–72°F (20–22°C).
Can my baby wear a sleep sack all year?
Yes — change the TOG rating and the layer underneath as the seasons turn, rather than abandoning the sack.
What TOG for 68°F?
2.0–2.5 TOG, over a long-sleeve bodysuit.
More free tools: TOG calculator · size guide · shop by milestone · gift finder · registry guide · capsule calculator · fabric decoder · certification checker · baby checklists — all in one place on Free Baby Tools & Guides.
Blog posts
Everetts Place Named Most Innovative Baby Boutique in Colorado 2026
Cotton Modal Comparison for Baby Clothes
Proud Donor to RedWhite & Babies