What is the ideal coffee-to-water ratio?

The standard starting ratio is 1:16 (1 gram of coffee per 16 grams of water). For stronger coffee, try 1:14; for lighter, 1:17. For espresso, the standard is 1:2 (18g in, 36g out in 25-30 seconds). Always measure by weight, not volume — a tablespoon of dark roast weighs less than light roast due to moisture loss during roasting.