The Athena Impact Estimator for Buildings brings life cycle assessment (LCA) to sustainable building design. With the complex LCA methodology and extensive Athena databases in the background, the Impact Estimator is an easy software tool that has been helping design professionals, sustainability consultants and students since 2002. It allows side-by-side comparisons, is useful at any design stage, and makes it easy to earn LCA credits in green programs like LEED®. Get the real numbers on embodied carbon and other life cycle environmental impacts of buildings.