Well, its really up to you.
Whether you grind your own beans or purchase ground coffee, you should be familiar with the variety of coffee grinds. Standard grind levels are (from most coarse to most fine): French Press Grind, Percolator Grind, Auto Drip Grind, Fine Grind, Espresso Grind, Turkish Grind.
For most people, the “auto drip” grind is standard, for those using a drip water system. These are standard coffee makers that most people purchase.
AUTO DRIP GRIND – for standard, modern drip coffee makers. This is the most common grind type. The grind consistency should be similar to standard granulated sugar.
PERCOLATOR GRIND – these are for the old fashioned style “percolator” coffee makers that most people used during the 1950’s through 1970’s. They are still sold today, but not widely used. Percolator grind is coarser than “auto drip”, but not as coarse as “French Press” grind.
FRENCH PRESS GRIND – this is a coarse grind for use in a french press or press pot. The coarser grind prevents the coffee grounds from seeping through the mesh screen of the press.
FINE GRIND – this is a finer ground coffee intended for use with most home espresso machines.
ESPRESSO GRIND – this grind is a very fine grind intended for use with commercial espresso machines. Generally it is too fine for use with most home espresso machines.
TURKISH GRIND – this is an extremely fine grind (rarely used in the U.S.) that grinds the bean into a very fine powder. Some European and Asian countries make their coffee in this style.