Life Cycle Assessment (LCA): Complete Guide for Businesses
Have you ever wondered what environmental impact a product creates before it reaches you, and what happens after you use it? This is exactly where Life Cycle Assessment (LCA) can help.
LCA is a structured method used to understand the environmental impacts associated with a product across different stages of its life cycle, from raw material extraction and manufacturing to transportation, use, and end-of-life, depending on the scope of the study.
For businesses, LCA goes beyond simply calculating carbon emissions. It can help identify environmental hotspots, understand where major impacts occur, and support better product and sustainability decisions.
In this guide, we’ll explain what Life Cycle Assessment is, how it works, its key stages, standards, tools, and practical applications in a simple and easy-to-understand way.
What Is Life Cycle Assessment (LCA)?
Life Cycle Assessment (LCA) is a method used to understand the environmental impacts of a product, process, or service throughout its life cycle. Think of it as looking at the bigger picture rather than focusing only on what happens inside a factory.
Depending on the defined system boundary, an LCA can look at everything from raw material extraction and transportation to manufacturing, product use, and end-of-life treatment. It considers the resources and energy consumed, as well as emissions and waste generated along the way.
But LCA is not just about calculating a product’s carbon footprint. It can assess several environmental impact categories, helping businesses understand where impacts occur and which stages contribute the most.
This makes LCA a useful tool for identifying environmental hotspots, comparing improvement opportunities, and supporting more informed product and sustainability decisions.
What Does an LCA Measure?
So, what does an LCA actually measure? It looks beyond a single environmental issue and evaluates different types of impacts linked to a product or process.
Depending on the study and the selected assessment method, an LCA can measure impacts related to climate change, energy and resource use, water use, acidification, eutrophication, ozone depletion, and other environmental indicators.
For example, a product may have relatively low emissions during manufacturing but create a larger environmental impact during raw material production or its use phase. LCA helps bring these impacts together so businesses can see where the major environmental hotspots occur.
This broader view helps companies make more informed decisions instead of focusing only on carbon emissions.
Why Is Life Cycle Assessment Important for Businesses?
Every product has an environmental impact, but do you know where most of that impact actually comes from? It could be the raw materials, transportation, manufacturing, product use, or even what happens at the end of its life. This is where Life Cycle Assessment (LCA) becomes valuable for businesses.
LCA helps companies look at the complete picture and identify the stages or processes that contribute most to environmental impacts. Once these environmental hotspots are understood, businesses can focus their improvement efforts where they can make a meaningful difference.
LCA can also support broader sustainability assessments such as EcoVadis by providing structured, product-level environmental data and evidence of environmental performance. If your business is preparing for an EcoVadis assessment, Growlity can also help you understand the requirements and organize the right sustainability evidence.
The LCA results can also support product development, material selection, supply-chain decisions, environmental performance improvement, and sustainability reporting. LCA can also provide the technical foundation for related studies and environmental communication, such as Product Carbon Footprints (PCF) and Environmental Product Declarations (EPDs), where applicable.
Simply put, LCA turns environmental data into actionable insights for better business and product decisions.
Want to understand where your product’s biggest environmental impacts occur? Talk to our LCA experts to assess your product, identify key hotspots, and turn the results into practical improvement opportunities.
What Are the 4 Stages of Life Cycle Assessment?
So, how is a Life Cycle Assessment actually carried out? An LCA generally follows four interconnected phases: Goal and Scope Definition, Life Cycle Inventory (LCI), Life Cycle Impact Assessment (LCIA), and Life Cycle Interpretation. Each phase helps build a clear picture of a product’s environmental performance.
1. Goal and Scope Definition
Every LCA starts by defining why the study is being conducted and what it will assess. This includes setting the goal, functional unit, system boundary, intended application, key assumptions, and data requirements.
For example, a study might assess the environmental impacts of producing 1 kg of a product from raw material extraction to the factory gate. A clearly defined scope ensures that the rest of the assessment remains consistent and relevant to its intended purpose.
2. Life Cycle Inventory (LCI)
Once the scope is clear, the next step is collecting the data. The Life Cycle Inventory (LCI) brings together the inputs and outputs associated with the product system.
This can include raw materials, energy, water, transportation, packaging, emissions, and waste. Primary company data can be combined with suitable secondary data where necessary. In simple terms, this stage builds the environmental inventory needed for the assessment.
Not sure what data you need or where to start? Growlity can help you identify the right data requirements, organize your product inventory, and select appropriate secondary data where primary information is unavailable, helping you build a reliable foundation for your LCA study.
3. Life Cycle Impact Assessment (LCIA)
Now the inventory data needs to be translated into meaningful environmental impacts. This happens during the Life Cycle Impact Assessment (LCIA).
Using an appropriate impact assessment method, inventory flows are classified and characterized into environmental impact categories such as climate change, acidification, eutrophication, ozone depletion, and resource use, depending on the study requirements.
This allows businesses to understand which activities or inputs contribute most to different environmental impacts.
4. Life Cycle Interpretation
Finally, the results are brought together and interpreted. This stage identifies environmental hotspots, significant contributors, limitations, and improvement opportunities.
The findings are also checked against the original goal and scope to ensure that the conclusions are consistent with the study.
In short, interpretation turns complex LCA results into practical insights that businesses can use to support product improvement and better-informed environmental decisions.
What Life Cycle Stages Can an LCA Cover?
Does every LCA need to assess a product from raw material extraction all the way to disposal? Not necessarily. The life cycle stages included in an LCA depend on the goal, intended application, and system boundary defined for the study.
Depending on the product and purpose, an assessment may cover raw material extraction, transportation, manufacturing, distribution, product use, and end-of-life activities such as recycling, recovery, or disposal.
Cradle-to-Gate vs. Cradle-to-Grave vs Gate to Gate
Three common ways to define an LCA system boundary are cradle-to-gate, cradle-to-grave and gate-to-gate
Cradle-to-gate: assesses environmental impacts from raw material extraction and upstream activities through manufacturing until the product leaves the factory gate.
Cradle-to-grave: takes a broader view. It follows the product from raw material extraction through manufacturing, distribution and use to its final end-of-life treatment.
Gate-to-Gate: Focuses on a specific process, facility, or manufacturing stage. It typically evaluates activities between the entry of materials into a defined process and the point where the output leaves that process.
Choosing the right boundary is important because it determines which life cycle activities and environmental impacts are included in the assessment.
Want to understand LCA and EPD system boundaries in more detail? Read our detailed guide on Cradle-to-Gate vs. Module D: Understanding EPD System Boundaries.
Life Cycle Assessment Example
Let’s understand this with a practical Life Cycle Assessment example from solar PV module manufacturing.
Imagine a solar PV manufacturer wants to understand the environmental impacts of producing its module. The LCA considers key materials and components such as solar cells, glass, aluminium frames, encapsulants, backsheets, junction boxes, and other materials, along with transportation, manufacturing energy, packaging, and other relevant life cycle stages based on the defined system boundary.
After modelling the product, the results show that solar cells and the aluminium frame are the main contributors to the module’s environmental impact. Solar cells can have significant upstream impacts due to energy- and material-intensive production, while the aluminium frame can contribute substantially through primary aluminium production and processing.
These findings give the manufacturer clear environmental hotspots to focus on. The company can then explore options such as lower-impact solar cells, higher recycled content in aluminium, renewable energy, improved material efficiency, and supplier engagement.
This is how LCA helps turn environmental results into practical opportunities for product improvement.
Which Standards Are Used for Life Cycle Assessment?
If you are conducting a Life Cycle Assessment, following a recognized framework is important to ensure the study is structured, consistent, and transparent. Two key international standards provide the foundation for LCA: ISO 14040 and ISO 14044.
ISO 14040 and ISO 14044
ISO 14040 sets out the principles and framework of Life Cycle Assessment. It explains the overall LCA structure, including goal and scope definition, Life Cycle Inventory (LCI), Life Cycle Impact Assessment (LCIA), and interpretation.
ISO 14044 goes a step further by defining the requirements and guidelines for conducting an LCA. It provides more detailed requirements for areas such as data collection, allocation, impact assessment, interpretation, reporting, and critical review.
Together, ISO 14040 and ISO 14044 provide the core methodological framework for conducting a transparent and scientifically structured Life Cycle Assessment study.
LCA vs. Product Carbon Footprint: What Is the Difference?
You might be wondering: if LCA already measures environmental impacts, how is it different from a Product Carbon Footprint (PCF)?
The main difference is the scope of environmental impacts assessed. A Life Cycle Assessment (LCA) can evaluate multiple environmental impact categories, such as climate change, acidification, eutrophication, resource use, and other relevant indicators across a product’s life cycle.
A Product Carbon Footprint (PCF), on the other hand, focuses specifically on greenhouse gas (GHG) emissions associated with a product and reports the climate change impact in kg CO₂ equivalent (kg CO₂e).
In simple terms, LCA gives you a broader environmental picture, while PCF focuses specifically on climate change.
Want to understand your product’s carbon emissions in more detail? Explore our Product Carbon Footprint (PCF) services to learn how PCF can support your carbon reduction and sustainability goals.
How Can Your Business Get Started With an LCA?
Getting started with a Life Cycle Assessment may seem complex, but it begins with a few clear questions: What product do you want to assess? Why are you conducting the LCA? And what data is already available?
From there, the study goal, functional unit, system boundary, and data requirements can be defined. Relevant information on raw materials, energy, transportation, manufacturing, packaging, waste, and other life cycle stages is then collected and modelled to understand the product’s environmental impacts.
You don’t have to figure it all out on your own. Growlity can support you throughout the LCA process, from defining the scope and collecting data to LCA modelling, interpreting results, and preparing the final report.
Need support with your Life Cycle Assessment? Contact our LCA experts and get started with your product assessmen
Ready to align your sustainability strategy?
Talk to Growlity about building your ESG reporting strategy.