The Purchase to Plate Crosswalk (PPC) enables researchers to measure the healthfulness of retail (grocery store) food purchases using the Healthy Eating Index. The Purchase to Plate Price Tool estimates prices for the foods reported by participants in the What We Eat in America study, the dietary component of the National Health and Nutrition Examination Survey (WWEIA/NHANES), and the Purchase to Plate Ingredient Tool breaks the prepared foods into generalized ingredient quantities. This study provides the background and methods used to develop these novel tools. The PPC uses a combination of probabilistic and manual matching to link the scanner data to the USDA Food and Nutrient Database for Dietary Studies (FNDDS). These tools were developed by USDA to meet the 2018 Farm Act requirement that USDA update the market basket of the Thrifty Food Plan (TFP) every five years, starting in 2022. The evidence-based update requires current prices and research on the cost and healthfulness of foods purchased by U.S. consumers. USDA plans to update these tools periodically to enable future updates of the TFP market basket. The National Average Prices for NHANES are available to researchers upon request.