The Embodied Carbon in Construction Calculator (EC3) tool, is a free and easy to use tool that allows benchmarking, assessment and reductions in embodied carbon, focused on the upfront supply chain emissions of construction materials. The EC3 tool utilizes building material quantities from construction estimates and/or BIM models and a robust database of digital, third-party verified Environmental Product Declarations (EPDs). Powered by this data, the EC3 tool can be implemented in both the design and procurement phases of a construction project to look at a project’s overall embodied carbon emissions, enabling the specification and procurement of the low carbon options.

The EC3 tool also allows owners, green building certification programs and policymakers to assess supply chain data in order to create EPD requirements, and set embodied carbon limits and reductions, at the construction material and project scale.

The tool and its subsequent effect on the industry is driving demand for low-carbon solutions and incentivizing construction materials manufacturers and suppliers to invest in disclosure, transparency and material innovations that reduce the carbon emissions of their products.

The building and construction sector have a vital role to play in eliminating carbon, as it is responsible for nearly 40% of global greenhouse gas emissions.

Architecture 2030 reports that between now and 2060 the world’s population will be doubling the amount of building floor-space, equivalent to building an entire New York City every month for 40 years. Much of the carbon footprint of these new buildings will take the form of embodied carbon — the emissions associated with material production and building construction.

In fact, Architecture 2030 reports that embodied carbon will be responsible for almost half of total new construction emissions between now and 2050. Unlike operational carbon emissions, which can be reduced over time with building energy efficiency renovations and the use of renewable energy, embodied carbon emissions are locked in place as soon as a building is built.

For more facts and figures and source data view Embodied Carbon Facts and Figures produced by the Carbon Leadership Forum.

The modern green building movement is only a few decades old, and during that time the movement’s laser-like focus has been on reducing operational energy – the carbon emissions that occur when a building is in operation – from energy used to heat, cool and power them. The highly visible nature of these operations, and the ease of measuring progress has led to many successes.

Understanding the carbon footprint of the entire supply chain for materials and construction is not only less obvious and visible, but it has been much more difficult to calculate. The result is that millions of people know something about the US Green Building Council’s LEED standard for energy efficiency; however, until recently, few had ever heard of embodied carbon, even inside the building industry. That has now changed significantly.

You can’t manage what you can’t measure, and until now, material suppliers have found it challenging and expensive to publish Environmental Product Declarations (EPDs) – technical documents reporting on the carbon footprint of a product – which are required in order to analyze the embodied carbon emissions associated with a new building. Moreover, the relatively small numbers of EPDs that were published could only be found in a variety of several different EPD databases, some of them proprietary and competitive with each other. Finally, virtually all EPDs have been unstructured and print-only PDF files -- documents that could not be easily evaluated or compared digitally.

With the launch of the EC3 tool, for the first time, thousands of digital EPDs are now available in a free, open source database. As a result, building designers, construction companies, and material suppliers will be able to directly measure, compare and reduce the embodied carbon in specific new buildings.

Experience using the EC3 tool on major pilot projects throughout 2019, such as the Microsoft campus refresh in Redmond, WA, has demonstrated that simply being able to compare products with the EC3 tool can reduce embodied carbon significantly, at no additional cost for materials.

The Carbon Leadership Forum and Building Transparency have produced the following documents, which can be found in the Downloads bar to the left:

EC3 Tool Product Brief, EC3 Tool User Benefits, EC3 Key Features, EC3 Tool Primer for AEC Professionals, EPD Request Letter from Company, EPD Request Letter from Project Team, Bid Document Template Language, Building Transparency EC3 Slide Deck

EC3 is tested with Microsoft Edge, Google Chrome, Mozilla Firefox, and Apple Safari.

Microsoft no longer supports Internet Explorer (they stopped in 2016) the new Edge architecture replaced it. Many of the underlying technologies behind EC3 do not support IE11, and we do not have the resources to provide a secure environment in IE11 in addition to more modern browsers.

Yes!  An OpenAPI 3.0 compliant, RESTful API is documented at 

You can

(a) email the PDF to, or

(b) upload it directly to (if you have access), or

(c) Enter the values via the web interface at

In cases (a) or (b), our system detects the new file and runs it through a set of proprietary parsing rules to extract the data. These rules are customized for each EPD program operator based on their format. If the data cannot be extracted, then the information is forwarded to our developers to either (a) create a script, or (b) assign the data to be entered manually.