How heavy should a weighted blanket be?

Body Weight	Blanket Weight
50 lbs.	6-7 lbs.
80 lbs.	9-10 lbs.
100 lbs.	11-12 lbs.
120 lbs.	13-14 lbs.
140 lbs.	15-16 lbs.
160 lbs.	17-18 lbs.
180 lbs.	19-20 lbs.
200 lbs.	21-22 lbs.