Weighted Blanket Size Calculator

Weighted blankets are sized on two independent axes. Mass is set by the user, conventionally at about 10 percent of body weight with a working band of 8 to 12 percent, so a 70 kg adult lands near 7 kg and a 90 kg adult near 9 kg. Area is set by the sleeper and the mattress: unlike a duvet, a weighted blanket sits on the mattress top rather than draping over the edges, because any fabric hanging past the perimeter carries weight that gravity progressively drags off the bed. A queen weighted blanket measures roughly 152 by 203 cm, far less than a queen comforter. Dividing mass by area gives a weight density, typically 2 to 3 kg per square metre, which is what actually determines the sensation on the body. The proposed mechanism is deep pressure stimulation, in which broad, evenly distributed static pressure is thought to shift autonomic balance toward parasympathetic activity. The 10 percent rule itself is a clinical heuristic rather than a validated dose, and the evidence base is modest, mostly limited to insomnia in psychiatric populations and sensory applications in occupational therapy. Safety constraints are firmer than efficacy claims: children should be at least about 20 kg, must be able to remove the blanket unaided, and children under two should never use one because of suffocation risk. People with sleep apnoea, asthma, COPD or circulatory impairment should seek medical advice, since added chest load can restrict breathing. Side and stomach sleepers concentrate the load over a narrower profile and generally tolerate 0.5 to 1 kg less than the nominal figure.

The therapeutic idea behind weighted blankets comes from sensory integration theory developed by the occupational therapist A. Jean Ayres in the 1960s and 1970s, which held that controlled proprioceptive and tactile input could regulate arousal in people whose sensory processing is atypical. The most influential demonstration came from Temple Grandin, who as a student in 1965 built a squeeze machine applying firm lateral pressure to the body after observing the calming effect of a cattle chute, and who published findings on its use with autistic people in the early 1990s. Occupational therapists translated that principle into portable equipment through the 1990s and 2000s, first as weighted vests and lap pads used in paediatric and school settings, then as full blankets. The 10 percent of body weight guideline circulated through that clinical practice as a rule of thumb long before it was studied formally. Commercial availability outside therapy was limited until a widely publicised crowdfunding campaign in 2017 turned the weighted blanket into a mainstream consumer product, after which mass manufacture drove down cost and standardised the fill weights sold today. Controlled evidence followed the market rather than preceding it. A randomised controlled trial of weighted chain blankets for insomnia in patients with psychiatric disorders, published by Ekholm and colleagues in the Journal of Clinical Sleep Medicine in 2020, is among the more frequently cited studies and reported improvements in insomnia severity, while acknowledging the limits of blinding in this kind of intervention.