Carbon Leadership Forum

Embodied Carbon in Construction Calculator (EC3)


To help building professionals make better decisions about embodied carbon in construction, and encourage supply chain accountability, by providing a free and open-source database of construction materials and their environmental impacts.


In collaboration with C-Change Labs, the Carbon Leadership Forum is developing the EC3 tool to help construction professionals efficiently quantify, report and reduce embodied carbon. EC3 will enable a performance-based approach to embodied carbon reductions in design, procurement, and construction. A public open source EPD database and building planner will launch by November 2019. Currently, the tool is in a pilot phase based at the Microsoft Campus. Overall, the tool will enable simple (but not simplistic) assessments of embodied carbon.

More information about this project can be found in the 2-page summary below:


The tool is currently under development but can be explored at


  • Kate Simonen (Director of the Carbon Leadership Forum, University of Washington): Grant management, education, policy, data methodology.
  • Phil Northcott (CEO of C-Change Labs): Tool development, data integration
  • Stacy H. Smedley (Director of Sustainability, Skanska): Tool implementation, education, policy
  • Don Davies (President, MKA): Industry champion


Sponsors and contributors to this project are shown below: