The paper presents the analysis of the guidelines of the European Union, adopted in May, 2019, on the common methodology and quality requirements for the uniform system of measuring the food waste levels in the EU Member States. The Waste Framework Directive obliges the Member States to monitor the generation of food waste and to take measures to limit their production; however, a lack of uniform, reliable method for measuring the food waste levels in the EU causes that it is difficult to evaluate the scale of the problem, its sources and the related tendencies in time. The food waste is generated across the whole food supply chain; so, it is especially troublesome to determine the level of the discussed waste. The food waste with different characteristics, different source and different reasons for its generation is produced in each stage of the chain. The current data on the food wastes do not specify their quantities. In connection with this fact, a separate legal act was developed, that is, the Commission Delegated Decision (EU) dated 3 May 2019, focusing on the measuring of food waste, which is harmonized with the existing systems of data collection and provides a framework for further measures of the Member States in respect of the quantitative determination of the food waste that is generated.