How much coffee should I use?

1 part coffee to this parts water:
Presets for strength
Water (grams)
Presets for Water
Coffee (grams)

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