Circular economy startups are pivotal in advancing sustainable and equitable economic models. This chapter explores their social impact, focusing on key metrics that highlight their contributions to environmental sustainability, economic development, social equity, and consumer engagement. By examining environmental benefits, job creation, inclusion practices, and supply chain sustainability, the chapter provides a comprehensive analysis of how these startups drive positive societal change. Challenges in measuring social impact are also discussed, emphasizing the need for standardized indicators and robust data collection. The findings underscore the importance of effective metrics in demonstrating the value of circular economy practices and guiding future developments. This exploration is crucial for stakeholders aiming to understand and enhance the role of circular startups in fostering a more sustainable and equitable future.