Reading Time: 8 minutes

Weighted blankets have gone from a niche therapy tool to a genuine sleep staple. But the most common question we hear at Mattress Miracle is simple: how heavy should mine be? Too light and you won't feel much difference. Too heavy and you'll feel pinned down rather than comforted. Getting the weight right matters more than most people think.

The good news is that finding the right weight isn't complicated. There's a straightforward formula that works for the vast majority of people, and a few practical considerations that help you fine-tune your choice.

The 10% Rule: How It Works

The most widely recommended guideline is to choose a weighted blanket that weighs about 10% of your body weight. This isn't arbitrary. The principle comes from occupational therapy research on deep pressure stimulation, which found that moderate, evenly distributed pressure calms the nervous system without restricting movement.

Here's how the math works in practice:

• 120 lb person: 12 lb blanket
• 150 lb person: 15 lb blanket
• 180 lb person: 17-20 lb blanket
• 200 lb person: 20 lb blanket
• 220+ lb person: 20-25 lb blanket

Since manufacturers don't make blankets in every single pound, you'll often round to the nearest available weight. Rounding down is usually safer than rounding up. A blanket that's slightly lighter than ideal still provides deep pressure benefits. One that's too heavy can feel suffocating and disrupt sleep rather than improve it.

Weighted Blanket Size Chart by Body Weight

Dorothy, our sleep specialist, put together this reference chart that we keep in the showroom. It accounts for the fact that blanket weights come in standard increments.

One thing Brad often mentions to customers: the 10% rule is a starting point, not a rigid requirement. Some people prefer a slightly heavier blanket because they like more pressure. Others, especially side sleepers, find that 8-9% of their body weight feels more comfortable because the weight concentrates on a smaller surface area when you're on your side.

If you're between sizes, consider your sleep position. Back sleepers can usually handle the higher end of the range because the weight distributes evenly. Side sleepers often do better at the lower end.

Choosing a Weighted Blanket for Children

The 10% rule applies to children as well, but with important safety guidelines. Weighted blankets are generally considered appropriate for children aged 3 and older who weigh at least 50 pounds. Below that age and weight, the blanket may be too heavy for the child to push off independently, which creates a safety concern.

For children who do well with weighted blankets, the benefits can be significant. Many parents in Brantford tell us their kids with sensory processing challenges or anxiety sleep noticeably better with the right weighted blanket. The key is starting with the lightest appropriate weight and only going heavier if the child asks for more pressure.

Children's Weight Chart

• 50-70 lbs: 5-7 lb blanket
• 70-90 lbs: 7-9 lb blanket
• 90-110 lbs: 9-11 lb blanket

Never exceed 10% of a child's body weight, and always round down rather than up for younger children.

Weighted Blankets for Couples

This is where things get interesting. The question we hear most from couples shopping at Mattress Miracle is whether they should get one large weighted blanket or two individual ones.

Our honest recommendation: two individual blankets almost always work better. Here's why.

When two people share a weighted blanket, the weight distributes unevenly. Whoever has more blanket pulled toward them gets more pressure, and whoever has less gets almost none. The 10% calculation also becomes tricky. A couple where one person weighs 140 lbs and the other weighs 200 lbs can't find a single weight that works well for both.

If you absolutely want to share one weighted blanket, go with a weight that's about 7-8% of the lighter partner's body weight. This ensures it won't be too heavy for either person, though the heavier partner may not feel as much benefit.

Filling Materials: What's Inside Matters

The weight in a weighted blanket comes from its filling material, and different fillings create noticeably different experiences.

Glass Beads

The most popular filling in modern weighted blankets. Glass micro-beads are small, dense, and nearly silent. They allow the blanket to drape closely against your body and distribute weight more evenly than other fillings. Blankets with glass beads tend to be thinner and less bulky, which also makes them cooler to sleep under.

Plastic Poly Pellets

These were the original weighted blanket filling. They're larger than glass beads, which makes the blanket feel chunkier. Poly pellets can also make noise when the blanket shifts, which bothers some sleepers. They're generally less expensive, but the trade-off in comfort is noticeable.

Steel Shot Beads

Very dense and heavy for their size, steel shot creates the thinnest possible weighted blanket. However, they can feel cold initially and make more noise than glass beads. Some higher-end blankets use steel shot combined with fibre fill to offset these downsides.

Natural Fillings

Some blankets use natural materials like sand, rice, or dried grains. We generally don't recommend these for long-term sleep use. They can absorb moisture, develop odours, and aren't easily washable. They're fine for a lap pad or short-term use but not ideal as a nightly bedding item.

When to Avoid a Weighted Blanket

Weighted blankets are safe for most adults, but there are situations where they're not appropriate. Brad always makes sure to mention these to customers, because no sale is worth someone's safety.

• Respiratory conditions: Asthma, COPD, sleep apnea, or any condition that makes breathing difficult. The added weight on the chest can make symptoms worse.
• Circulatory problems: Conditions like deep vein thrombosis or peripheral neuropathy. The pressure could restrict blood flow.
• Claustrophobia: If you feel anxious or trapped under a heavy duvet, a weighted blanket will likely make that worse, not better.
• Very young children: Under age 3 or under 50 lbs. Infants should never use weighted blankets, sleep sacks, or any heavy covering.
• Post-surgery recovery: Particularly after abdominal or chest surgery. Consult your doctor before using any weighted bedding during recovery.
• Elderly individuals with frailty: If someone has difficulty turning over or getting out of bed, a weighted blanket could pose a risk.

When in doubt, consult your doctor before purchasing a weighted blanket, especially if you have any chronic health conditions.

Caring for Your Weighted Blanket

A weighted blanket is an investment, and proper care extends its life considerably.

Dry your weighted blanket on low heat or air dry. High heat can damage the filling material and warp the quilted pockets that keep the weight evenly distributed. If air drying, drape it over a sturdy outdoor line or a drying rack rated for heavy items. A regular indoor drying rack may buckle under the weight.