Zeroing? Do you mean figuring out the true count (TC) from the running count (RC)? If so, the calculation is: Running_Count / Decks_Remaining = True_Count


For example, the running count is +12 and you are about 2/6 of the way through the shoe (so there are 4 decks remaining), you would divide 12/4 to get 3 -- so the TC at this point would be 3.