FastLCA is a free, browser-based life cycle assessment calculator for construction materials. Calculate GWP across all EN 15804 life cycle stages — A1 through C4 plus Module D — using the EPiC Database 2024 or your own verified EPDs. Nothing to install, no account required.
Calculate embodied carbon for any construction material or assembly. Results in seconds.
Open the calculator →FastLCA performs a streamlined life cycle assessment focused on Global Warming Potential (GWP), expressed in kg CO₂e. It covers the full EN 15804+A2:2019 module structure:
⚠ FastLCA provides indicative estimates for early-stage design decisions — not a certified LCA or EPD. For formal compliance reporting, engage a certified LCA practitioner.
| Feature | FastLCA | Most free tools |
|---|---|---|
| No login required | ✓ | Often required |
| Works in browser — nothing to install | ✓ | Often Excel or desktop |
| Full A1–C4 + Module D coverage | ✓ | Usually A1–A3 only |
| Add your own EPD products | ✓ | Rarely |
| Shows full calculation for verification | ✓ | Black box results |
| Assembly calculator (kg CO₂e/m²) | ✓ | Uncommon |
| Scope 3 calculator included | ✓ | Separate tool |
| Dark mode | ✓ | No |
39 generic construction materials using the hybrid LCI approach from the University of Melbourne. Covers concrete, steel, timber, insulation, masonry, glass, and more.
Add product-specific EPD values from any EN 15804 EPD. The EPD Extractor tool reads values directly from PDF documents.
Build wall, floor, and roof assemblies layer by layer. Get kg CO₂e/m² results — the standard metric for RICS and RIBA reporting.
Every result shows the complete calculation chain — quantity × factor = result — so you can verify every number independently.
Turn your Bill of Materials into a Scope 3 Category 1–6 inventory using DESNZ 2025 factors. GHG Protocol aligned.
Download a formatted PDF report with full methodology disclosure, data sources, and calculation breakdown.
Generic material factors come from the Environmental Performance in Construction (EPiC) Database 2024, published by Crawford, Stephan and Prideaux at the University of Melbourne (DOI: 10.26188/10257728.v11). EPiC uses a hybrid life cycle inventory (LCI) approach combining process data and input-output data, which captures upstream indirect supply chain emissions that process-only EPDs miss. This makes EPiC values systematically higher than European manufacturer EPDs — not because EPiC is wrong, but because it's measuring more of the supply chain.
Licence: CC BY-NC-ND 4.0. Used as internal calculation input only.
FastLCA follows the modular structure of EN 15804+A2:2019. Module D is always reported separately and never added to the A1–C4 total, per clause 6.4.3.4.
The Scope 3 calculator uses UK Government DESNZ 2025 GHG conversion factors for fuel WTT, transport, waste disposal, and business travel. Open Government Licence v3.0.
FastLCA is designed for sustainability professionals, architects, engineers, and contractors who need a quick, transparent embodied carbon estimate at early design stage — without the cost or complexity of certified LCA software. It is also useful for:
FastLCA is a screening tool, not a certified LCA platform. Key limitations: