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Working together to promote and advance the global comparability of measurements

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  • About us

    About us

    Benefits of participation
    Benefits of participation
    • Page Benefits of participation
    • Member States
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    • How to join us
    Governance
    Governance
    • Page Governance
    • CIPM
    • CGPM
    • Founding documents
    • Strategy
    Our Mission and Objectives
    Our Mission and Objectives
    • Page Our Mission and Objectives
    • Our work programme
    • Knowledge transfer (CBKT)
    • Staff of the BIPM Headquarters
    • Jobs and opportunities
    • How to get to the BIPM
    Historical information
    Historical information
    • Page Historical information
    • Evolution of the SI
    • Metre Convention
    • Pavillon de Breteuil
  • CGPM (2026)
  • Coordination

    Coordination

    CIPM MRA
    CIPM MRA
    • Page CIPM MRA
    • Participating laboratories
    • Use of the CIPM MRA logo
    • Documents on the CIPM MRA
    • CIPM MRA Comparison reports
    • CMC approval process
    • JCRB
    • KCDB >>
    • Help on the KCDB
    CIPM Forums
    CIPM Forums
    • Page CIPM Forums
    • Metrology and Digitalization
    CIPM Consultative Committees
    CIPM Consultative Committees
    • Page CIPM Consultative Committees
    • CCAUV
    • CCEM
    • CCL
    • CCM
    • CCPR
    • CCQM
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    • CCTF
    • CCU
    Capacity Building and Knowledge transfer: CBKT
    Guides in Metrology Committee: JCGM
    Guides in Metrology Committee: JCGM
    • Page Guides in Metrology Committee: JCGM
    • JCGM-WG1 (GUM)
    • JCGM-WG2 (VIM)
    International reference time scales
    International reference time scales
    • Page International reference time scales
    • Time FTP Server
    • Time Department Database
    Laboratory medicine: JCTLM
    Laboratory medicine: JCTLM
    • Page Laboratory medicine: JCTLM
    • JCTLM Database >>
    • JCTLM portal >>
  • Liaison

    Liaison

    Institutional liaisons
    Institutional liaisons
    • Page Institutional liaisons
    • Alphabetical list
    • Formal agreements
    • Digital transformation
    • Quality infrastructure
    • Technical liaisons
    CODATA-TGFC
    Joint Committees
    Joint Committees
    • Page Joint Committees
    • Guides in Metrology Committee: JCGM
    • Laboratory medicine: JCTLM
    • CIPM MRA: JCRB
    NMI Directors and Member State Representatives
    Regional metrology organizations
    Regional metrology organizations
    • Page Regional metrology organizations
    • AFRIMETS
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    • SIM
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  • Technical/Scientific

    Technical/Scientific

    The SI
    The SI
    • Page The SI
    • Defining constants
    • SI base units
    • SI prefixes
    • Practical realizations
    • SI Brochure
    • SI promotion
    • Redefinition of the second
    Technical areas of the BIPM
    Technical areas of the BIPM
    • Page Technical areas of the BIPM
    • Electrical metrology
    • Gas metrology
    • Mass metrology
    • Organic analysis
    • Radiation dosimetry
    • Radionuclide metrology
    • Time metrology
  • Publications & Events

    Publications & Events

    Publications
    Publications
    • Page Publications
    • Annual Review
    • CGPM: Proceedings
    • CIPM: Publications
    • CIPM MRA Comparison reports
    • Documents on the CIPM MRA
    • Financial Report
    • Guides in Metrology (GUM and VIM)
    • Metrologia
    • Monographies BIPM
    • Practical realizations
    • Notification
    • Rapports BIPM
    • Scientific output
    • SI Brochure
    • Standard frequencies
    • Time scales and related data
    Metrology resources
    Metrology resources
    • Page Metrology resources
    • SI Digital Framework
    • e-Learning Platform >>
    • Impact Studies
    • Common terms
    • JCTLM Database >>
    • KCDB - CIPM MRA Database
    • Metrology in the fight against Covid-19
    • Time scales - BIPM FTP server
    • Time Department Database
    Events
    Events
    • Page Events
    • Upcoming
    • 28th meeting of the CGPM (2026)
    • BIPM and co-organized workshops
    • World Metrology Day
    • 150th anniversary
    • External events

  • Metrology areas

    • AUV: Acoustics, Ultrasound and Vibrations
      • CCAUV
      • BIPM contact: Dr Gianna Panfilo
    • EM : Electricity and Magnetism
      • Metrologia: Focus on Metrology in Electricity and Magnetism
      • CCEM