Usually you can figure 10-11 feet per ounce. So if you’re figuring you’re running a certain depth say 37 feet at 175 feet of line out with a 2 oz weight. Then you should be around 47 feet with a 3oz at 175. Obviously your speed will factor in also. Yesterday we were running 2.0-2.2 mph on the gps. We figure we were running around 55-60’ down at that speed. Fish were 55-65 feet and we were hammering them. Remember you want to be above or equal to the fish you’re marking not below. From all I have read, walleye will go up to get your bait but rarely go down in depth to get it.