Understanding the weighted blanket weight formula
A weighted blanket works by applying gentle, even pressure across the body, an effect often called deep pressure stimulation. The standard guideline used by manufacturers, occupational therapists, and sleep retailers alike is simple: the blanket should weigh about 10% of the user's body weight, with an acceptable range of roughly 7% to 12% depending on personal preference for lighter or firmer pressure.
The formula
For an adult or teen, the recommended blanket weight is:
- Recommended weight = body weight × 10% (a reasonable single target)
- Acceptable range = body weight × 7% to body weight × 12%
For example, a 150 lb (68 kg) adult targets about 15 lb, with a comfortable range of roughly 11 to 18 lb. Since blankets are manufactured in fixed sizes — commonly 5 lb steps from 5 to 30 lb, or custom-made in 1 lb steps — the raw result is rounded to the nearest weight actually sold.
Adjusting for children
Children's bodies are smaller and more sensitive to restriction, so common safety guidance is more conservative for kids. Weighted blankets are generally not recommended for children under 2 to 3 years old because of suffocation and entrapment risk — a young child may not be able to remove a heavy blanket unassisted. For children roughly 3 to 12 years old, guidance typically caps the blanket at about 10% of the child's body weight rather than allowing the higher end of the adult range, and a caregiver should always verify the manufacturer's own printed weight limit and supervise use.
Why sizing follows body weight, not bed size
Unlike a comforter, a weighted blanket is sized to fit the sleeper's body rather than drape over the entire mattress. A blanket cut to cover a full queen or king bed for one sleeper would weigh far more than the 7-12% guideline, defeating the point of calibrated pressure. Most weighted blankets are sized to sit on top of the sleeper and tuck in at the sides, so the weight — not the surface area — is what should scale with the bed size.
How to use the result
Start from the 10% figure, then adjust within the 7-12% range based on preference: lighter for a first-time user or someone who runs warm at night, heavier for stronger calming pressure. Round to whichever manufactured size is closest, and always confirm the choice against the product listing's own recommended weight range before buying.