Although it is not their main objective, most national household expenditure surveys (HES) generate accessible and reliable food security information. To date, however, WFP has rarely used these rich data sources for conducting food security analysis. The purpose of this guide is to familiarise with the largely untapped pool of food security information available from HES datasets. This guidance is largely based on key sections from IFPRI’s comprehensive and highly recommended technical guide: Measuring Food Security Using Household Budget Surveys. Officers who plan to make use of an HES for food security analysis should become familiar with the approach from this guide but will also need to refer to the IFPRI guidance for more detailed instructions.