I will sum up in a nutshell. I’m using a medium yarn as double strand with size 15 needles. I need a short gauge sample (enough for 4 inches) smiley. I got 9 stitches per 4 inch. I’m making a washcloth that is 8.5 in width (measured a home cloth). How do I determine how much to cast on? When I do per inch I get 2.5 then times by 8.5 and get 21.25. Calculating with the 4 inch leaves me with 16? What am I doing wrong? Help and THANK YOU.