The protein quality of 11 breakfast cereal‐milk mixtures combined as normally eaten (1 oz cereal and 4 oz fluid milk) was determined by using a modified slope‐ratio assay. Slope ratios (milk = 100) of three of the mixtures (oatmeal‐milk, cream of rice‐milk and shredded wheat‐milk) were higher than that of milk alone. Using protein content and slope ratios it was calculated that 1 oz of the various cereals could increase potential protein value over that of milk alone by 26 to 117%, and that some of the mixtures could supply as much as 22% of the recommended daily allowance for an 8–10‐yr‐old child. It is suggested that information of this sort combining the protein quality of food mixtures as eaten with the protein content of a serving would be welcomed by consumers.