Measuring impact is an important aspect of sustainability for startups. Some of the metrics that sustainable startups use to measure their impact include carbon footprint, energy efficiency, waste reduction, and water conservation. Startups can use various tools and frameworks such as B Corp certification, the Global Reporting Initiative (GRI), and the United Nations’ Sustainable Development Goals (SDGs) to measure and report their impact. By measuring their impact, sustainable startups can track their progress, identify areas for improvement, and communicate their sustainability achievements to stakeholders.