A weighted blanket should be between 5-15% of you body weight to be effective. It is a personal choice how much weight to get, most often people get too little, if you are looking to save cost you are better off going down a size rather than reducing the weight. This is because you can always use the blanket over top of a larger blanket but it is challenging to add weight without adding too much warmth.
To figure out your best weight range you can take you weight in pounds and multiply it by 0.05 and 0.15 this will give you range that will work, 15% being the max you should consider especially with kids. If you would like a personalized recommendation that includes extrapolating for the weight being spread across a larger surface area please email us with your height and weight.
In the mean time I made up this chart quickly that should help answer the question “What size of weighted blanket is right for me”