# EC3 (Embodied Carbon in Construction Calculator)

> Tool · Building Transparency · status: Free web tool; API access per Building Transparency's plans · checked 2026-10-23
> ES: Herramienta web gratuita; acceso a la API según los planes de Building Transparency

A large database of EPDs and category baselines for comparing materials by embodied carbon; the factors source for the embodied-carbon skill when product EPDs are not yet known.

## How to connect or install
Create an account at buildingtransparency.org; see the API access page for keys.

## Links
- https://www.buildingtransparency.org/
- Docs: https://www.buildingtransparency.org/api-access-pricing/

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