Espresso machine or fully automatic coffee machine having automatic determination of the grain size distribution and/or the degree of grinding of ground coffee

An espresso machine or fully automatic coffee machine, comprising:

• a grinder and an infusion device comprising an infuser and an infusion chamber;
• a volume-determining portion designed to determine a ground volume of a quantity of coffee powder, ground by way of the grinder;
• a mass-determining portion designed to determine a ground mass of the quantity of ground coffee powder;
• and
• a calculation portion having a memory portion with a first predefined table (A) stored therein that describes a correlation between the mass of the ground coffee powder and the volume of the ground coffee powder, and a second predefined table (Z) stored therein that describes a correlation between a grain size distribution of the ground coffee powder and a density of the ground coffee powder;
• wherein there is calculated from the ground volume and ground mass a group consisting of 1) the grain sieze distribution of the ground coffee powder and 2) an x63.2 value degree of grinding of the quantity of ground coffee powder;
• wherein 63.2% of the grains of a given grain size distribution have a smaller size than the x63.2 value.