How do I decide what the correct weight to use is? 

We have many Weighted Blankets in stock that are a fairly standard weight. By standard weight we put aproximatley 40 grams or more pollypellets in each pocket. Depending on the size of the blanket to the ultimate weight. But this is shown on the pricing page. Occupational Therapists ususally recomend 10% plus 500 grams of the body weight.