Calculate embodied carbon by multiplying each building material or system quantity by a carbon factor whose unit and life-cycle boundary match that quantity, then sum the impacts across the items and modules you have chosen to assess. Before calculating, define the building scope, purpose, assessment stage, life-cycle modules and applicable standard. Report the result in kgCO₂e with its boundary, denominator, data sources, assumptions and exclusions: an A1–A3 total, for example, is not a whole-life carbon result.
What the result means—and what it does not
A building carbon assessment is only interpretable when a reader can tell what was counted. The same project can produce different totals depending on whether the calculation covers product manufacture alone, construction as well, replacements during use, operational energy, or end-of-life. Define the boundary before assembling quantities or selecting factors.
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Keep these terms distinct:
- Upfront carbon commonly means emissions through construction, often modules A1–A5. The convention can vary, so state exactly which modules your result includes.
- Embodied carbon describes material- and construction-related impacts across the life-cycle modules selected by the method. There is no meaningful total without naming those modules.
- Whole-life carbon is broader. Depending on the method and scope, it can include embodied impacts, operational energy and water, and user-related emissions over the building’s life.
These categories are not interchangeable. In particular, an A1–A3 result covers product supply and manufacture; it does not include the full construction stage or the building’s entire life cycle.
Understand the life-cycle modules
The RICS whole-life carbon framework uses life-cycle modules to make clear which stages are included. Module labels help organize the calculation, but they do not by themselves establish that a particular scope is required for every project. Follow the standard, client brief, certification scheme or regulation that applies, and show the chosen boundary in the report.
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| Module | What it covers | How to treat it in the calculation |
|---|---|---|
| A1–A3 | Product supply, transport to manufacturing and manufacturing | Use a factor that covers these modules for each material or system. Label the result as A1–A3 if no other modules are included. |
| A4 | Transport to the project site | Model the project’s transport scenario or use an applicable stated default. Record relevant assumptions such as transport distance. |
| A5 | Construction and installation processes | Include applicable construction impacts and document the scenario or assumptions used. |
| B modules | Use-stage impacts, including maintenance, repair, replacement, refurbishment, operational energy and water | Choose the B modules relevant to the assessment. Replacement and operational impacts depend on project facts and the selected method. |
| C1–C4 | Deconstruction or demolition, transport, waste processing and disposal | State the end-of-life scenarios and assumptions used; do not imply these impacts are included if they are outside the assessment. |
| D | Potential benefits or loads beyond the assessed system boundary, such as recovery or reuse | Report separately according to the applicable method. Do not silently subtract a beyond-boundary benefit from the main result. |
A whole-life assessment may also include B6 operational energy and B7 water, and the RICS framework includes B8 user activities. These are different from embodied carbon. Make clear whether your stated result includes them or is limited to embodied impacts.
A defensible calculation, step by step
1. Define the decision, project and boundary
Write down what the assessment is meant to inform: an early design comparison, client reporting, procurement, certification or regulatory compliance. Identify whether the project is new construction, a retrofit or an existing asset; its assessment stage; and the building and elements included. A design-stage estimate, a result based on measured quantities and an as-built assessment are not the same kind of evidence.
Choose the method and any jurisdictional or client requirements before setting the scope. For RICS members completing a whole-life carbon assessment, the RICS second edition standard has been in full effect since 1 July 2024; RICS states that members need to follow its requirements, and deviations must be recorded. This is not a universal legal requirement for every project or location. Verify the rules that apply to your project rather than treating one professional standard as mandatory everywhere.
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Record building elements included and excluded. Be explicit about whether the assessment covers substructure, superstructure, façade, services, finishes, external works or other relevant parts. A number without a building scope can be mistaken for a complete building total when it only represents selected elements.
2. Select modules and name the result
Decide whether you are calculating upfront carbon, embodied carbon over selected modules, or whole-life carbon. Record the specific modules—for example, A1–A3 or A1–A5—rather than relying on a label alone. If the project brief or standard calls for additional modules, include them or clearly state that they are outside your result.
A first-edition RICS minimum scope historically included substructure and superstructure, A1–A3, A4–A5, façade replacement B4 and operational energy B6. Treat that as historical context, not as a substitute for the current second edition or a local requirement. Check the actual method governing the project.
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List the materials, products and systems that fall within the chosen scope, with a quantity and unit for each. Use the best information available for the project stage: elemental estimates early in design, more detailed measured or modelled quantities as design develops, and as-built quantities when available. Record the source of each quantity and any conversion used.
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Include relevant building systems and components, not just the most visible structural materials. The appropriate inventory depends on the assessment boundary and the level of information available. Document omissions instead of allowing a partial quantity take-off to read as a complete assessment.
A BIM model can help supply quantities when it contains suitable element data and the assessment workflow can interpret them. It does not, by itself, determine which elements or modules belong in scope, whether model quantities are complete, or which carbon factors match the products. Check the model-derived quantities, units and exclusions against the assessment boundary before calculating.
4. Choose a factor that matches each quantity
Prefer a relevant product-specific Environmental Product Declaration (EPD) when one is available and compatible with the assessment method. If not, use an appropriate category-level EPD or generic factor, and label it accordingly. A proxy should be justified as similar enough for the intended estimate; it should not be presented as product-specific evidence.
For each factor, check the declared unit, modules covered, production geography, technology and data age. A factor per unit mass cannot be applied directly to a quantity in volume or area without a justified conversion. A factor covering A1–A3 cannot support an A1–A5 claim unless the additional modules are calculated separately or otherwise covered by a method that is clearly documented.
Data availability, electricity-grid assumptions and end-of-life assumptions can differ between countries and datasets. A single global method does not remove those differences. Record the factor source and relevant data characteristics so that a reviewer can see where project-specific data ends and generic assumptions begin.
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5. Convert units and calculate item impacts
The basic calculation for each item and module is:
Impact (kgCO₂e) = quantity × applicable carbon factor
First convert the project quantity into the factor’s declared unit. Then multiply by the matching factor, keeping the module boundary consistent. Repeat for every item and relevant module. If the factor is per declared unit and the project has a quantity in a different unit, do not multiply until the units have been reconciled and the conversion is documented.
For example, if a factor is expressed per cubic metre, the quantity used in that multiplication must also be in cubic metres; the resulting impact is then assigned only to the modules covered by that factor. This describes the unit logic, not a project-specific carbon value.
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6. Add project scenarios and sum transparently
Calculate transport to site, construction and installation, maintenance, replacements, and end-of-life where these are in scope. Use known project facts where possible; otherwise state the defaults or assumptions prescribed by the chosen method. Transport distances, service lives, replacement cycles and waste routes are project-specific inputs and can materially affect the result.
Sum impacts by item and module, then by element and building as needed. Keep module totals visible rather than reporting only one combined number. Handle biogenic carbon, removals and emissions according to the applicable method, and do not quietly net a benefit from outside the assessment boundary against the main total.
7. Report, review and update
Report the total in kgCO₂e or a clearly stated multiple, alongside a normalization basis suited to the project—for example, an applicable floor area or internal volume. State the area or volume basis precisely. If two buildings use different denominators or cover different scopes, their intensity figures are not directly comparable.
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Identify the assessment stage, included building elements and modules, factor sources, geographic relevance, data quality or confidence, assumptions and exclusions. Update the calculation as design information, product selections, construction quantities and post-completion facts become available. Preserve enough detail that another practitioner can trace totals back to quantities, factors and scenarios.
How to choose and compare carbon factors
Use this order of preference as a practical starting point, while meeting the requirements of the project’s method:
- Product-specific EPD: use it when it represents the product being specified and its declared unit and modules fit the calculation.
- Category-level EPD: use an applicable category dataset when a suitable product-specific declaration is unavailable, and identify it as category-level data.
- Generic factor or justified proxy: use this when more specific information is not available. Explain why it is a reasonable fit and identify it as generic or proxy data.
Do not choose a factor solely because it is easy to find or gives a lower result. Compare the following before using it:
- Does its declared unit match the quantity, or can the quantity be converted on a documented basis?
- Does the factor cover the modules being reported?
- Does it represent the relevant product, technology and production geography?
- Is the data age appropriate for the method and decision?
- Is its data quality suitable for the stage and purpose of the assessment?
When factors differ, first check whether the difference comes from a genuine product distinction or a mismatch in units, modules, geography, technology or assumptions. Do not treat values as comparable until those boundaries align.
Independent reader supportYour contribution helps us test, update, and keep practical guides available for everyone.How to make project results comparable
A lower intensity number does not automatically mean a lower-carbon building. A fair comparison requires aligned assessment boundaries and consistent reporting choices. Check that projects use the same or compatible:
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- building scope and included elements;
- normalization basis and denominator;
- factor sources and data quality;
- assessment period or service-life assumptions; and
- transport, replacement, maintenance and end-of-life scenarios.
For instance, an A1–A5 result should not be ranked against an A1–A3-only result as if both represented the same stages. Likewise, floor-area and internal-volume intensities are not interchangeable. RICS first-edition guidance uses kgCO₂e as the reporting unit and gives NIA or internal volume as examples of possible normalization bases depending on use class; the current method and local rules should determine the basis for a particular project.
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Tools that can support the work
Tools can help find EPDs, compare materials or assemble a building assessment, but their stated scope matters. A product comparison tool or an A1–A3 screen is not automatically a whole-life carbon assessment.
| Resource | What its provider describes | When it may help | Scope check |
|---|---|---|---|
| RICS Whole life carbon assessment, 2nd edition | Professional standard with related templates and guides | Practitioners following RICS requirements for whole-life carbon assessment | Confirm the applicable requirements and record deviations where required. RICS members have been required to follow the second edition when completing a whole-life assessment from 1 July 2024. |
| EC3 by Building Transparency | Free, open-access tool and EPD database for finding and comparing construction materials and planning or comparing project embodied-carbon impacts | Supply-chain EPD discovery and material comparisons | Check which modules and project details a particular result covers before describing it as whole-life carbon. |
| One Click LCA Planetary | Free tool described by its provider as giving a cradle-to-gate A1–A3 view for building designs | Early-stage A1–A3 screening | Its help documentation describes limited database and commercial features compared with the provider’s commercial building LCA software. An A1–A3 view does not include other modules by itself. |
| Commercial building LCA software | Vendor descriptions include whole-building LCA, embodied-carbon assessment, data access and design or construction workflows | Assessments requiring broader modules, structured project workflows or professional reporting | Verify method conformity, module coverage, data relevance and any vendor-reported dataset or integration claims for the project and date concerned. |
Choose a tool by the required assessment method, modules covered, geographic relevance of its data, quantity or BIM workflow, reporting transparency and confidence information. A free EPD comparison or early-stage screen can serve a different purpose from a professional whole-building assessment. No tool description alone establishes that its output meets a particular project’s regulatory or certification requirements.
Jurisdiction and compliance are project-specific
The title alone does not establish a country, building type, certification or regulatory purpose, so there is no single rule that can be presented as globally mandatory. RICS’s second edition is in full effect for its members from 1 July 2024, but that fact does not make it the governing rule for every project.
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Repair common Windows errors and clear accumulated junk for a smoother, more stable PC - no reinstall needed.Free scan · no reinstallThe EU Energy Performance of Buildings Directive includes requirements for calculating life-cycle global-warming potential for new buildings under its provisions, using relevant EN 15978 requirements. Member States may make specified scope choices when setting limit values. National implementation and project-specific requirements therefore matter; verify the current legal text and the rules applying where the building is located before treating a calculation as compliance evidence. Stage-by-stage calculation and representative product scenarios are also discussed in a 2026 delegated regulation, but its applicability should be checked against the current legal text and project circumstances.
Common calculation mistakes to avoid
- Calling A1–A3 whole-life carbon: describe the modules actually included; product-stage impacts are not the whole building life cycle.
- Multiplying mismatched units: convert the quantity to the factor’s declared unit before applying it.
- Using a factor with the wrong boundary: confirm module coverage rather than assuming a factor includes construction, use or end-of-life.
- Leaving out scenario assumptions: document transport, service life, replacement, waste route and other applicable inputs.
- Presenting generic data as product-specific: label category, generic and proxy factors honestly, and explain the selection.
- Reporting a total without scope: state the included elements, modules, denominator and exclusions so the number can be interpreted.
- Comparing unlike intensity figures: align the modules, building scope and normalization basis before drawing a conclusion.
- Netting module D into the main total without explanation: keep potential benefits or loads beyond the assessed boundary distinct under the applicable method.
What a useful final report contains
A reader or reviewer should be able to understand what the figure represents and how it was assembled. Include:
- the project, purpose, assessment stage and applicable method;
- the building boundary, elements included and explicit exclusions;
- the life-cycle modules included, with separate totals where useful;
- the total in kgCO₂e and its normalization basis;
- quantity sources, factor sources, declared units and data quality;
- geographic and technological relevance of the data;
- transport, construction, use-stage and end-of-life assumptions as applicable; and
- treatment of biogenic carbon, removals and module D impacts under the method.
These details make the result useful for design decisions and later updates. As quantities become more precise and specified products replace early assumptions, the assessment can be recalculated without obscuring which inputs changed.
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