About this tool
The Weighted Blanket Weight Calculator is a free, in-browser tool that recommends an ideal weighted-blanket weight from body weight, using the widely cited 10% rule. Enter a body weight, choose whether it is for an adult or a child, and optionally a lighter or heavier preference, and it returns a point estimate, an acceptable range, and the nearest available retail size. All math runs locally in your browser, and the tool includes a safety note rather than medical advice.
The method is straightforward: the recommended weight is about 10% of body weight. For adults an acceptable band runs from roughly 8% to 12%, so a preference toggle lets you pick 8% (lighter), 10% (standard), or 12% (heavier). For children the recommendation is 10% of body weight plus about 1 pound, and the tool will not recommend a weighted blanket for a very small child — under about 20 pounds — because a blanket that is heavy relative to a small body is unsafe. The point estimate is then snapped to the nearest commonly sold size (5, 7, 10, 12, 15, 20, or 25 lb).
As a worked example, a 150-pound adult at the standard 10% lands on 15 pounds — exactly a common retail size — with an acceptable range of about 12 to 18 pounds. This tool is a general sizing guide, not medical advice: a weighted blanket should never restrict movement or cover the face, and weighted blankets are not safe for infants or toddlers. Anyone with a respiratory, circulatory, or sleep condition should consult a clinician before use.