15g coffee bean liquid weighs 60ml. Traditionally, about 20 grams of coffee beans can make 100 ml espresso. One kilogram is 500 grams. According to the conventional standard, 20 servings 100 ml espresso can be produced. That's 2000 ml of coffee. If it is the same cup size, then two cups need 30g powder. If you need coffee for two people, you need about 25g of powder.