The golden ratio is 1:17. For each 1 gram of coffee grounds for each 17 ml of water.

  1 g =   17 ml
  6 g = 1.02 dl
 12 g = 2.04 dl
 30 g = 5.10 dl
 60 g = 1.02 l

Moccamaster measuring spoon holds 12 g of coffee. Thus, it takes exactly as many spoonfuls of coffee grounds as there is the "cups" (1.25 dl) count on the water reservoir to make a standard strong coffee.

8 cups = 1 liter of water 8 spoons = 96 grams of coffee grounds = strong coffee 5 spoons = 60 grams of coffee grounds = light coffee

Source

• Various coffee package texts.