The quantitative methodology is one of the two foundational resources that power the GreenEUR Environmental Impact Calculator. It provides a systematic, transparent, and practical framework to quantify the environmental footprint of Erasmus+ KA2 project activities. Using Life Cycle Assessment, it measures impacts from mobility, energy use, materials, and digital activities across five key indicators, enabling projects to identify environmental hotspots and reduce their overall footprint. About GreenEURproject The GreenEURproject is an EU-funded initiative that supports the integration of sustainability into EU-funded projects. It provides practical tools to help project leaders and institutions measure, reduce, and manage the environmental impact of their activities. Key results: Environmental Impact Calculator – measures the footprint of project activities and identifies areas for improvement. Green Label – certifies projects based on their environmental performance. Guidelines and Handbook – practical advice for designing and implementing greener projects. Policy Recommendations – proposals to embed sustainability into EU project evaluation and funding processes.