The following works great for me using the level 71 nike putter and any ball..........divide the distance as follows...Slow greens divide distance by .9 standard/fast greens by 1.1 veryfast greens 1.2 tourney greens 1.36 champions greens 1.5......also I add 25% of elevation number (if 8inch rise I ad 2ft and so on)and subtract 25% of drop number when putting downhill..,,it all takes a bit of tweeking but these work for me..