A method for measuring a quantity of coffee MNi or MTi that a grinding burr of a coffee mill driven in rotation by a motor dispenses in a predetermined number of revolutions Ni of the grinding burr or in a predetermined time interval Ti. According to the method: the average speed Vi of the grinding burr in a number of revolutions Ni or respectively in a time interval Ti is measured; and the quantity or mass MNi of coffee dispensed in the number of revolutions Ni or respectively the mass MTi of coffee dispensed in the time interval Ti is deduced as a function of the speed Vi from an experimentally obtained stored correspondence table (Vi, MNi) or (Vi, MTi).