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Definition

ISO 14044

ISO 14044 sets the requirements and guidance that make an LCA's method choices, calculations, interpretation, reporting and review traceable to its stated purpose.

What is ISO 14044?

ISO 14044:2006 is the requirements standard for carrying out and reporting a life cycle assessment (LCA). ISO 14040 supplies the framework; ISO 14044 controls the choices and records that turn that framework into a study someone can examine.

Why does ISO 14044 matter to you?

A customer may ask whether a product study follows ISO 14044. You need more than the standard number. The report must connect its intended use to the measured function, included processes, data-quality rules, shared-input method and interpretation. A planned public product comparison also changes the review needed before publication.

How does ISO 14044 work?

For a process shared by several products, first test whether separate measurement or a broader product system can avoid splitting the input. If not, use a measured physical cause. Use economic value or another justified relationship when no physical link exists. Then run completeness, sensitivity and consistency checks to see whether missing data or another defensible choice changes the conclusion.

What mistakes should you avoid?

  • Choosing a convenient split without proving what drives the shared process.
  • Hiding exclusions or data-quality limits that could reverse the finding.
  • Publishing a comparative claim before confirming the required critical-review process.

What records support an ISO 14044 claim?

Keep the exact function, product amount needed to deliver it, process map, source records, allocation equations, impact-method version, exclusions, sensitivity results and review report.

Does ISO 14044 make two LCA results comparable?

No. Check that both studies measure the same performance and use consistent boundaries, data quality, allocation rules and impact methods before comparing their results.

When do you need a critical review?

Set the review from the study's intended use. A public claim that one product is environmentally better than another needs the standard's comparative-assertion review safeguards, not a late internal sign-off.

Example

Suppose a machinery maker in Germany studies a pump whose functional unit is moving 200 m3 of clean water per hour against a 30-metre head, at 78% hydraulic efficiency or better, for 20,000 operating hours. The reference flow is one pump, including one heat-treated shaft and two replacement seal kits needed to deliver that service.

A furnace batch uses 720 kWh and produces 60 pump shafts plus gear blanks. The two orders occupy equal furnace zones. An empty-cycle meter test records 300 kWh; the remaining 420 kWh varies with load mass. Pump shafts are 240 kg of the 600 kg load. The physical split assigns 300 kWh / 2 + 420 kWh x 240 / 600 = 318 kWh to the shafts, or 318 / 60 = 5.3 kWh per functional unit.

A mass-only split would assign 720 kWh x 240 / 600 / 60 = 4.8 kWh per unit. The 0.5 kWh difference is 10.4% of 4.8 kWh. The study records the meter test, zone layout, mass log, both equations and whether that difference changes its conclusion.

Where it comes up

ISO 14044 requirements for LCA goal and scope, inventory, impact assessment, interpretation, reporting and critical reviewISO 14044:2006 official abstract and current-edition statusOfficial sourceGHG Protocol Product Standard life-cycle rules built on ISO 14044, including allocation steps adapted from clause 4.3.4.2Product Life Cycle Accounting and Reporting Standard, sections 5.1-5.2; Chapter 9, Figure 9.2 and endnote 4Official source

Related terms

Life cycle assessment (LCA)

A life cycle assessment (LCA) estimates a product's or service's potential environmental impacts for a defined function and life-cycle boundary, using recorded inputs, stated impact methods, and a documented interpretation of the results.

ISO 14040

ISO 14040 sets the principles and four-phase framework for life cycle assessment, covering goal and scope, inventory, impact assessment, interpretation, reporting, critical review and limitations without prescribing detailed calculation methods.

Functional unit (LCA)

A functional unit states the quantified performance a product or service must deliver, giving an LCA one reference against which every input, output, and environmental result is measured.

GHG allocation key

A greenhouse gas (GHG) allocation key is a measurable driver used to divide shared emissions among products, services, sites, contracts, or customers when emissions cannot be measured separately for each output.

Sources

  • International Organization for Standardization

    Current ISO 14044:2006 edition, amendments, LCA phases, reporting, critical review, limitations and use of value choices

    2026-08-20

  • GHG Protocol

    Sections 5.1-5.2 adoption of ISO 14044's life-cycle approach, Chapter 9 allocation hierarchy, and ISO 14044 clause references

    2026-08-20

Last verified 2026-08-20

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ISO 14044 Definition | Keslio