– the intergovernmental organization through which Member States act together
     on matters related to measurement science and measurement standards.
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Member States / how to become a Member State

The Metre Convention is an intergovernmental treaty which is open to all States having diplomatic relations with France (the depository of the Treaty) and willing to pay their entrance fee and annual contribution to the BIPM.

Overview of the procedure for a State wishing to accede to the Metre Convention and thus become a Member State*:

  • After being motivated to participate in the activities of the BIPM contact should be made with the Director of International Liaison and Communication Department (Mr Andy Henson) or the BIPM Director (Dr Martin Milton) who can provide detailed advice on the rights and obligations and on the accession process.

  • Having decided to proceed, a State must make the formal national decision to accede in accordance with its own constitutional requirements.

  • The Government of the State must then notify the French Government (i.e. Ministry for Europe and Foreign Affairs) through its ministry in charge of foreign affairs/Embassy in Paris** of its accession to the Metre Convention, including deposition of the national instrument of accession (decision document).

The payment of the first annual contribution (per calendar year) plus an entrance fee*** equal to the first annual contribution must be made directly to the BIPM.

*. The official term is "State Parties to the Metre Convention"; the term "Member States" is its synonym and used for easy reference.

**. Not all States have an Embassy in Paris, and such States make arrangements to deal with the French Ministry for Europe and Foreign Affairs through, for example, their Embassy in Belgium.

***. Special arrangements apply regarding the entrance fee of States that are Associate States of the CGPM at the time of accession.
Member States
Related articles
Notice of Contributions
Calculating Member State contributions
List of Member States
Signatories of the MRA
Participation in
keychart and supplementary comparisonschart
Number of CMCs published per domaintable
NMI Directors and State Representatives