How Heavy Should Your Weighted Blanket Be? | The 10% Rule

Most adults sleep best with a weighted blanket around 10% of their body weight, a ratio many guides adjust anywhere from 5% to 12% for comfort.

Finding the right weight for a weighted blanket is a Goldilocks problem: too light and it won’t provide the calming pressure you’re after, too heavy and it can feel restrictive or even strain your sleep. Most sources point to a simple starting formula—roughly 10% of your body weight—but the ideal number shifts slightly based on who’s using it. Here’s how to dial in the right weight for adults and children, plus the safety rules that matter.

Adults: The 10% Formula And Its Comfort Range

For most adult sleepers, the standard advice is to choose a blanket that weighs about 10% of your body weight. So a 150-pound person would start with a 15-pound blanket, while a 200-pound person would look toward a 20-pound option.

That’s a guideline, not a law. Several reputable guides note that a practical range of 5% to 12% of body weight works well, with most people gravitating toward the 10% mark. If you’re between sizes, or if you find a 10% blanket feels too heavy, it’s perfectly sensible to size down. The goal is a gentle, even pressure that feels soothing—not a blanket that pins you down or makes it hard to shift position at night.

If you’re considering a specific weight, a 10-pound blanket is a common sweet spot for lighter adults and teens, and it’s a versatile midpoint for body weights roughly between 100 and 150 pounds. For a tested roundup of excellent options in this size, take a look at our guide to the best 10lb weighted blanket picks to see which ones suit different sleeping styles.

Children: No More Than 10%—And Usually Less

For children, the guidance is stricter. Multiple pediatric sources, including clinical guidance from NHS Borders and Oxford Health, recommend that a weighted blanket used by a child should generally be no more than 10% of the child’s body weight. In practice, this often means the blanket should be as light as possible while still providing a calming effect.

There are two non-negotiable safety rules that apply to any child using a weighted blanket. First, the child must be able to remove the blanket independently. If a child can’t push it off by themselves, the blanket is too heavy or too large for them, regardless of the percentage. Second, the blanket must never cover the child’s face or neck. For these reasons, the same clinical sources urge that a weighted blanket be used for short periods with supervision and professional guidance rather than overnight without oversight.

Why The Wrong Weight Causes Problems

The most common mistake with weighted blankets is choosing one that’s simply too heavy. Using a blanket that weighs more than 12% of your body weight—or that feels like a restraint—can lead to discomfort, overheating, and restless sleep. A clinical guide from Gillette Children’s notes that a weighted blanket should be as lightweight as possible for the desired effect and shouldn’t be used for long durations, such as overnight, without professional guidance.

For children, a blanket that’s too heavy becomes more than a comfort issue; it’s a safety hazard if the child can’t wriggle free. If the weight feels like it’s holding you or your child in place, that’s a clear sign to size down or use it only for short, supervised sessions.