The Building Energy Efficiency Calculator (BEEC) is a tool designed to quickly assess a building's energy performance. Its objectives include evaluating individual buildings' energy efficiency, comparing baseline performance to energy standards, and recommending energy efficiency measures. 

It targets municipalities, energy managers, analysts, and technicians, providing insights into the impact of system components on energy demand. 

Developed by the Copenhagen Centre on Energy Efficiency (C2E2) under the Euroclima+ funded Energy Sustainable Municipal Buildings project, BEEC aims to enhance energy management practices.