Carbon Footprint of a Brick: LCA Benchmark (10,000 Simulations)
Last updated: 2026-05-06
Based on 10,000 Monte Carlo simulations using the Ecoinvent 3.9.1 database, the carbon footprint of a brick has a median value of 1.0 kg CO₂e per kg of brick. The 80th percentile range spans from 0.7 to 1.2 kg CO₂e per kg, reflecting real-world variability in raw material sourcing, kiln firing energy, and regional manufacturing conditions. This benchmark is grounded in published Environmental Product Declarations and peer-reviewed literature from 14 data sources.
How Much CO₂ Does a Brick Produce?
Impact Score Scale (A to E)
| Score | Rating | Range |
|---|---|---|
| A | Excellent | 0.00 – 0.80 kg CO₂e/kg |
| B | Good | 0.80 – 0.93 kg CO₂e/kg |
| C | Average | 0.93 – 1.03 kg CO₂e/kg |
| D | Below Average | 1.03 – 1.13 kg CO₂e/kg |
| E | High Impact | 1.13 – + kg CO₂e/kg |
Phase Contribution Overview
LCA Phase Breakdown: Where Do the Emissions Come From?
| Phase | Median (kg CO₂e) | Contribution |
|---|---|---|
| Raw Materials | 0.22 | |
| Manufacturing | 0.45 | |
| Packaging | 0.01 | |
| Transport | 0.29 | |
| Use Phase | 0.00 | |
| End of Life | 0.03 |
Key Findings
- The median carbon footprint of a brick is 1.0 kg CO₂e per kg, with a mean of 1.0 kg CO₂e per kg across 10,000 simulations.
- The 80th percentile range (P10–P90) spans 0.7 to 1.2 kg CO₂e per kg, indicating a spread of 0.5 kg CO₂e per kg driven by variability in energy mix, clay composition, and kiln efficiency.
- The standard deviation of 0.2 kg CO₂e per kg highlights moderate uncertainty in brick manufacturing emissions, reflecting differences in production technology and geography.
- 20 published EPDs were reviewed as part of this benchmark, alongside peer-reviewed literature from sources including Ecoinvent 3.9.1, DEFRA 2025, and multiple academic journals.
How This Benchmark Compares to Published Data
| Product / Study | Source | CO₂e |
|---|---|---|
| Greenhouse Gas Emissions and Decarbonization Potential of Global Fired Clay Brick Production - PMC | PMC / EPFL (PMC11800390) | 0.18 per kg |
| Carbon footprint of solid clay bricks fired in clamps of India | Request PDF | ResearchGate — Bangladesh brick kiln study | 0.22 per kg |
| Sustainability of Building Materials: Embodied Energy and Embodied Carbon of Masonry | MDPI Energies (2023) | 0.24 per kg |
| Large CO2 reduction and enhanced thermal performance of agro-forestry, construction and demolition waste based fly ash bricks for sustainable construction | Scientific Reports | Scientific Reports (Nature, 2024) | 0.29 per kg |
| Study of Life Cycle Assessment of Bricks and the Impacts to ... | IOP Conference Series, Materials Science and Engineering | 0.32 per kg |
| How Can We Reduce the Carbon Footprint of Bricks? | Architectmagazine | 0.48 kg CO2e/kg |
| Carbon-reduced bricks overview as industry R&D tackles climate impact | RIBA Journal (citing Belgian LCA research) | 0.54 per kg |
Methodology: ISO 14040 Monte Carlo Simulation
This benchmark is produced by running 10,000 Monte Carlo simulations drawing from the Ecoinvent 3.9.1 life cycle inventory database, following ISO 14040/44 methodology. Probabilistic sampling across input parameters captures uncertainty in emissions factors, energy consumption, and supply chain variability to produce a statistically robust distribution of results.
Frequently Asked Questions
What is the carbon footprint of a brick?
Based on this benchmark, the carbon footprint of a brick is approximately 1.0 kg CO₂e per kg (median value). The typical range across 80% of simulations falls between 0.7 and 1.2 kg CO₂e per kg, depending on manufacturing location, energy sources used in kiln firing, and raw material extraction conditions.
How is this benchmark calculated?
We run 10,000 Monte Carlo simulations using the Ecoinvent 3.9.1 life cycle inventory database, following the ISO 14040/44 LCA framework. Each simulation samples from probability distributions for key input parameters, producing a range of outcomes. The median, mean, standard deviation, and percentile values reported here summarise that full distribution. The benchmark also draws on 20 published EPDs and 14 data sources including academic journals and industry databases.
Which life cycle phase contributes the most?
While phase-level data varies across individual studies, brick manufacturing is widely understood to be dominated by the production stage — particularly the energy-intensive kiln firing process required to fire clay at high temperatures. Raw material extraction and transport also contribute to the overall footprint. The variability captured in the P10–P90 range of 0.7 to 1.2 kg CO₂e per kg largely reflects differences in kiln energy sources and manufacturing efficiency across regions.
How can I reduce the carbon footprint of my brick?
The most effective strategies for reducing brick carbon footprint include sourcing bricks manufactured using lower-carbon or renewable energy for kiln firing, prioritising suppliers with verified low-carbon EPDs, and considering reclaimed or recycled bricks where structurally appropriate. Locally sourced bricks can also reduce transport emissions. Since the benchmark range spans 0.7 to 1.2 kg CO₂e per kg, specifying products from the lower end of this range can meaningfully reduce embodied carbon in construction projects.
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