Guys, let me be the first to tell you that this isnt accurate, no matter how good it sounds. Ive wasted alot of line in the past by trying to do this. On my Stradic Ci4+ this method was off roughly 25 revolutions of the handle, the IPT varies on spool depth and how much line is on the spool, as the spool fills it changes. Its best to just mark off an area and stretch the line out if possible, this also allows you to get out any line twist when you retrieve all of your line with nothing attached to the end.