How heavy should a weighted blanket be?

The widely used rule of thumb is about 10 percent of the user's body weight for adults and teens. So a 150-pound adult is usually recommended a 15-pound blanket, and a 200-pound adult a 20-pound blanket. A safe range runs from about 8 to 12 percent, and you should not go above 15 percent. Children use a lighter rule of around 5 to 8 percent. The calculator applies the right percentage and rounds to the nearest stocked size.

What is the 10 percent rule for weighted blankets?

The 10 percent rule says a weighted blanket should weigh roughly one-tenth of the user's body weight. It originated in occupational therapy clinics in the 1990s, where clinicians found that about a tenth of body weight reliably produced a calming deep-pressure response without feeling oppressive. It is a guideline rather than a strict medical formula, so a pound or two either way is fine, but it should not be pushed far beyond 12 percent for adults or used at the full 10 percent for young children.

Are weighted blankets safe for children?

They can be, with caution. Weighted blankets are generally considered suitable only for children aged 3 and older who weigh at least 50 pounds, and they should be lighter than an adult's, around 5 to 8 percent of the child's body weight. Crucially, the child must be able to move the blanket off themselves without help. Weighted blankets are not safe for infants and toddlers, and a child under 5 should use one only after speaking with a paediatrician. Never place a heavy adult blanket on a child.

Can a weighted blanket be too heavy?

Yes, and too heavy is not better. A blanket above about 15 percent of body weight can feel oppressive rather than calming, make it hard to move or breathe comfortably, and is unsafe if the user cannot push it off. The deep-pressure benefit comes from a moderate, even weight, not a maximal one. If a blanket feels restrictive, leaves you unable to shift position, or makes breathing feel laboured, it is too heavy and you should size down. The safe range exists precisely to prevent overloading.

What weight weighted blanket should a child use?

For a child who is at least 3 years old and weighs 50 pounds or more, aim for about 5 to 8 percent of their body weight. A 50-pound child would use roughly a 4 to 5-pound blanket, and a 70-pound child about a 5 to 6-pound blanket. Do not apply the adult 10 percent rule to children, and never use an adult-sized 15-pound-or-heavier blanket on a child. For any child under 5, or any child with a medical condition, check with a paediatrician first.

Who should not use a weighted blanket?

Weighted blankets are not suitable for infants and toddlers under 3, and should be avoided by anyone who cannot remove the blanket themselves. People with obstructive sleep apnea, respiratory conditions such as asthma or COPD, circulatory problems, low blood pressure, type 2 diabetes with circulation issues, or claustrophobia should consult a doctor before use. The added weight can affect breathing and circulation in vulnerable people. When in doubt, speak to a healthcare professional before choosing a weighted blanket.

Should I size up if I am between two weighted blanket weights?

Generally size down rather than up if you are between standard weights and unsure, because a slightly lighter blanket is comfortable while a slightly heavy one can feel oppressive. Some people do prefer a pound or two over the 10 percent figure for a more grounding feel, which is fine as long as you stay within the safe range and below 15 percent. The calculator shows both the recommended weight and the nearest stocked sizes above and below it, so you can choose with the range in mind.

What size weighted blanket do I need, not just the weight?

A weighted blanket should match the body of the person using it, not the bed. Unlike a regular comforter, it should not hang over the edges, because the weight on the overhang would drag the whole blanket onto the floor. For one adult, a blanket of about 48 by 72 inches works on most beds; for a child, around 36 by 48 inches. If two people share a bed, it is usually better for each to have their own blanket than to buy one oversized shared one, so each gets the correct weight.

Do weighted blankets actually help with sleep and anxiety?

Many users report that the deep, even pressure feels calming and helps them relax and fall asleep, an effect often compared to a firm hug, and some studies suggest weighted blankets may reduce anxiety and improve sleep for certain people. The evidence is still developing and results vary from person to person, so a weighted blanket is best seen as a comfort aid rather than a medical treatment. If you have a diagnosed sleep or anxiety disorder, discuss it with a healthcare professional rather than relying on a blanket alone.

Weighted Blanket Calculator – Weight by Body Weight

Weighted Blanket Calculator

The Weighted Blanket Calculator works out how heavy a weighted blanket should be from body weight, using the 10 percent rule for adults and a lighter 5 to 8 percent for children. It returns the recommended weight, a safe range, and the nearest stocked size, plus a size recommendation and prominent safety guidance. Children are only suitable from age 3 and at least 50 lb, the blanket must always be removable unaided, and people with certain medical conditions should consult a doctor. This is general guidance, not medical advice.

What Is the Weighted Blanket Calculator?

The Weighted Blanket Calculator works out how heavy a weighted blanket should be for a particular person, based on their body weight, and gives a safe range alongside the single recommended figure. Enter whether the blanket is for an adult or a child and the body weight, and the calculator applies the appropriate percentage rule, names the nearest stocked size to buy, and sets out the safety considerations that matter, especially for children. The guiding principle, as the Sleep Foundation explains, is the 10 percent rule: an adult's blanket should weigh about a tenth of their body weight, with children kept lighter.

What makes this calculator responsible as well as useful is that it treats safety as part of the answer, not an afterthought. Given that the most common and most dangerous mistake is putting too heavy a blanket on a child, the tool uses a more conservative percentage for children, flags when a child is too young or too light, and reminds users that the blanket must always be light enough to push off unaided. On top of the weight, it recommends a blanket size that fits the body rather than the bed, and points to a doctor where a medical condition makes professional advice the right step.

The 10 Percent Rule and the Safe Range

The core of weighted blanket sizing is the 10 percent rule: an adult or teen should use a blanket weighing about one-tenth of their body weight. A 150-pound adult is therefore guided toward a 15-pound blanket, and a 200-pound adult toward 20 pounds. The rule traces back to occupational therapy clinics in the 1990s, where clinicians found that roughly a tenth of body weight produced a calming deep-pressure effect without feeling oppressive. It is a guideline, not a precise prescription, so a pound or two in either direction is perfectly fine.

Around that single figure sits a safe range. For adults the comfortable band runs from about 8 to 12 percent of body weight, and the weight should never exceed 15 percent. As Casper's weighted blanket guide notes, heavier is not better: too much weight feels restrictive rather than soothing and can make movement and breathing harder. The calculator shows the recommended weight, the safe minimum and maximum, and the nearest stocked size, so you can choose within the range with confidence rather than guessing at a single number.

Children and Weighted Blanket Safety

Children need a different and more cautious approach, which is the single most important point this calculator makes. The adult 10 percent rule is too heavy for a child; instead, aim for around 5 to 8 percent of the child's body weight. Just as important, weighted blankets are generally considered suitable only for children aged 3 and older who weigh at least 50 pounds, and never for infants or toddlers. The table below summarises the guidance the calculator applies.

User	Recommended Weight	Safe Range	Key Condition
Adult / teen	~10% of body weight	8 to 12%, max 15%	Must be removable unaided
Child 3+ (50 lb or more)	~7% of body weight	5 to 8%, max 10%	Child can move it off alone
Child under 3, or under 50 lb	Not recommended	Consult a paediatrician	Risk of being unable to move it

The overriding safety rule is that the blanket must always be light enough for the user to move it off themselves without help, which is why an adult's 15-pound-or-heavier blanket must never be placed on a child. As Mosaic's weighted blanket weight guidance stresses, the calming effect depends on the right weight, and exceeding it removes the benefit while adding risk. For any child under 5, or any child with a medical condition, speak to a paediatrician before use.

Choosing the Right Size, Not Just the Weight

Weight is the headline number, but the dimensions of the blanket matter too, and they follow a rule opposite to a normal comforter. A weighted blanket should match the body of the person using it, not drape over the sides of the bed. If it hangs over the edges, the weight on the overhang drags the whole blanket onto the floor during the night. For one adult, a blanket around 48 by 72 inches sits neatly on top of most beds; for a child, about 36 by 48 inches is typical.

This also affects couples. Because the blanket should match each person's body and weight, two people sharing a bed are usually better served by two individual blankets than one oversized shared one, so each gets the correct weight for their own body. With that in mind, the calculator recommends a size to go with the weight, and the same careful measuring habit applies to the rest of the bed linens you might plan with our fabric calculator if you are making your own.

Accuracy and Limitations

The calculation itself is simple and reliable: it applies the established percentage rules to the body weight you enter and rounds to standard stocked sizes. The adult and child percentages, the safe ranges, and the caps reflect the guidance used across the industry and by sleep-health resources, so the recommended weight is a sound starting point for most people.

That said, this is general guidance and not medical advice. Individual needs vary, and the right weight can depend on personal preference, sensory sensitivity, and health conditions that a calculator cannot assess. People with sleep apnea, respiratory or circulatory conditions, low blood pressure, diabetes with circulation problems, or claustrophobia should consult a doctor before using a weighted blanket, as the added weight can affect breathing and circulation. The calculator deliberately errs toward caution for children, but it cannot replace a paediatrician's judgement for a young or medically complex child. Treat the output as a guide, and prioritise the safety rule that the user must always be able to remove the blanket themselves.

The Most Common Weighted Blanket Mistake: Applying the Adult Rule to a Child

In my experience the most dangerous error people make is taking the familiar 10 percent rule and applying it to a child, or simply buying a child the same blanket as the rest of the family. A child needs a markedly lighter blanket, around 5 to 8 percent of their body weight, and must be physically able to move it off without help. An adult-weight blanket on a small child is not a cosier choice; it is a genuine safety hazard, because the child may not be able to push it aside. With that in mind, always switch to the child setting for anyone under their teens, respect the minimum age of 3 and the 50-pound minimum weight, and check with a paediatrician whenever there is any doubt. The right weight soothes; the wrong weight, especially for a child, is a risk not worth taking.

Weighted Blanket Calculator