Of course, the average cost of food per month from family to family varies. The USDA has established four different consumption levels for American families of four people. These levels are: thrifty, low-cost, moderate-cost, and liberal. These levels assume that all meals and snacks are consumed at home which is more cost-effective than eating out. The thrifty family of four on average spends $550 per month on food, and the Liberal family spends about $1100. One might assume that most families fall into the Low-cost and Moderate families which on average spend $700 and $875 per month respectively.