The attched two files are a spreadsheet and description document I've put together. They help you determine how many sts you need for a custom-fit, top-down, any yarns/needles raglan sweater. They're written in Excel and Word. Please try the process and let me know your response to it. I hope it's useful. It works for me.
The file named "BespokeRaglanSweater.xls is the spreadsheet: you just enter a few measurements and it takes it from there (except YOU have to do the knitting.) The file named BespokeRaglanSweater.doc is my attempt to explain briefly and comment on the sprdsht.
My email: firstname.lastname@example.org
If you want to try it without measuring somebody first, try it with my measurements to see if it works.
test swatch # sts--15
test swatch # inches--4