The Food Waste Index Report aims at supporting the goals of SDG 12.3. It achieves this by presenting the most comprehensive food waste data collection, analysis, and modeling to date, thereby generating a new estimate of global food waste; and by publishing a methodology for countries to measure food waste at the household, food service, and retail levels, enabling the tracking of national progress towards 2030 and reporting on SDG 12.3.  Countries using this methodology will generate strong evidence to guide a national strategy on food waste prevention, that is sufficiently sensitive to pick up changes in food waste over two- or four-year intervals, and that enables meaningful comparisons between countries globally.