How much coffee should I use?

In coffee, ratios of ground beans to water tend to be about the same regardless of brew method (espresso being, as always, an exception).

The well-endorsed industry standard ratio is about 1 part coffee to 18 parts water but many strong brew aficionados will go as strong as 1 part coffee to 13 parts water.

I personally use a ratio of 1:16 as a starting point in most of my at-home brewing.

— Tony Konecny, Tiptoeing Toward Scales