Weights and Measures Codes of practice

The Greenhouse Gas Reporting (Weights and Measures) Codes of Practice 2025 (Weights and Measures Codes of Practice) provides methods, criteria and measurement standards for calculating greenhouse gas emissions and energy data under the Greenhouse Gas Reporting Standard 2025 (GHGR Standard). It covers scope 1 and scope 2 emissions and energy production and consumption.

The Weights and Measures Codes of Practice is updated annually to reflect improvements in emission estimation methods. Changes are also made in response to industry feedback. Reporters should make sure that they use the correct version of the Weights and Measures Codes of Practice, corresponding to the year in which they are reporting. Reporters should also be aware of the relevant amendments made for that year. Amendments, compilations and explanatory memoranda for each year can be found on the on the GHGR Standard page.

Overview

Amendments to the Weights and Measures Codes of practice for 2023–24。More information on particular amendments is available in the  Greenhouse Gas Reporting (Weights and Measures) Amendment (2023 Update) Codes of practice.

Amendments

Further details on the consultations that have been conducted to develop the GHGR Rules can be found on the Consultation Hub website, under the heading 'Closed Consultations'.

Consultation papers and submissions

See our Guidelines page for guidance on applying the Weights and Measures Codes of Practice.

Reporting guidelines