Simple Counting Question

[KITT 007]

Greetings,

I am relatively new to counting at Blackjack.

All I would like to know is when calculating the true count do you divide by the amount of decks remaining up the cut or do you also include the decks behind the cut.

For example the count is +12.

There are 4 decks left in total but 3 decks left before we get to the cut and reshuffle. Would the true count be +4 or +3.

Any information or support greatly appreciated.