How this instrument works
Weighted blankets are filled with glass beads or plastic pellets to add mass, on the idea that gentle, even pressure across the body (sometimes called deep pressure stimulation) can help some people relax or fall asleep more easily. Picking a weight that's too light won't produce much of that pressure effect; picking one that's too heavy can feel restrictive or become genuinely difficult to move under. Weight recommendations are built around body weight for exactly that reason.
The individual formula here — bodyweight divided by 10, plus 1.5 pounds — is a commonly cited starting-point guideline for a single sleeper. Occupational-therapy and sleep-health sources generally frame a good target as somewhere around 10% of body weight, with this specific plus-1.5-pound version being one widely used variant of that rule. The couple's formula is different in kind, not just scale: rather than adding two individual recommendations together (which would double-count the pressure benefit), it takes 7.5% of the two people's combined weight, landing on a single shared blanket that's noticeably lighter per person than two individual blankets would be.
These are starting points, not medical prescriptions. Personal comfort varies, and some sources recommend staying at or under roughly 10% of body weight as a general ceiling rather than a fixed target — if a suggested weight feels too heavy once you're actually under it, sizing down is a reasonable adjustment, and this calculator's output should be treated as a reasonable first guess to shop from rather than an exact requirement.
- Enter your body weight in pounds.
- Read the individual recommended blanket weight.
- If you're sizing a shared blanket for a couple, enter your partner's weight too.
- Read the couple's recommended weight — calculated differently from simply adding two individual figures together.
Worked example — a 178 lb sleeper, alone and with a partner
A 178 lb person calculating their own blanket: individual weight = 178/10 + 1.5 = 17.8 + 1.5 = 19.3 lb exactly — a good starting point to shop from, likely rounding to a commonly stocked 20 lb blanket.
The same person sharing a bed with a partner who also weighs 178 lb: couple's weight = 7.5% of (178+178) = 0.075 x 356 = 26.7 lb. Notice that's far less than double the 19.3 lb individual figure (which would be 38.6 lb) — the couple's formula deliberately avoids just adding two individual recommendations, since a blanket that heavy would be impractical to actually use.
Questions
Why isn't the couple's blanket weight just double the individual recommendation?
Because the couple's formula (7.5% of combined weight) is a separate guideline from the individual one (10% of weight plus 1.5 lb), not two individual recommendations stacked together. Doubling the individual figure for two similarly sized partners would produce a blanket in the high 30s or 40s of pounds, which most sources consider impractically heavy for shared use; the lower combined-weight percentage keeps a shared blanket manageable.
What if my weight isn't close to my partner's?
The couple's formula still applies the same way — it uses the sum of both weights, so a lighter and heavier partner sharing a blanket still get a single combined figure at 7.5% of their total. If the weight difference is large, some couples prefer two separate lighter blankets over one shared heavier one, since a single weight can't be individually ideal for two very different body weights at once.
Is there a maximum safe weight for a weighted blanket?
General guidance from sleep and occupational-therapy sources suggests staying at or under roughly 10% of body weight, and this calculator's individual formula sits close to that line. This isn't medical advice, and anyone with mobility limitations, respiratory conditions, or who is pregnant should check with a healthcare provider before using a weighted blanket, since restricted movement under a heavy blanket carries real risk for some people.
Are weighted blankets appropriate for children?
This calculator's formula isn't intended for young children, since the same weight-to-body-mass considerations that apply to adults carry more risk at a child's smaller size and more limited ability to reposition themselves. Weighted-blanket guidance for children typically comes from a pediatrician or occupational therapist directly rather than a general adult formula like this one.
Why is there a fixed +1.5 lb added to the individual formula instead of a flat 10%?
The plus-1.5-pound addition is simply the specific variant of the '10% of body weight' guideline this calculator uses, matching a commonly published version of the rule. Other sources state the guideline as a flat 10% with no addition, or round to the nearest available manufactured weight (blankets are typically sold in whole- or half-pound increments), so treat any of these variants as landing in the same general neighborhood rather than one being definitively more correct.