In assessing adults’ dietary intakes, nutritionists and dietitians often rely on clients’ reported food consumption, estimated in units of households measuring utensils (cups, tablespoons and teaspoons). However, it is yet to be established whether the public can accurately estimate the capacity of household utensils and the amount of food consumed in units of household measuring utensils. The purpose of the study was to examine conceptions of household measuring utensils and establish how well participants estimate the sizes of household measuring utensils comparing with metric sizes of 250 ml for a cup, 15 ml and 5 ml for a tablespoon and a teaspoon, respectively.